<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e4163-6fc5-7989-a482-00338f0b56a0,g:b4bc611a-f22e-48c2-94af-7df30e3700c4-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:sunc="http://www.sunocolp.com/20260630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.sunocolp.com/20260630">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/stpr/2026" schemaLocation="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sunc-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sunc-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sunc-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sunc-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="DocumentAndEntityInformation" roleURI="http://www.sunocolp.com/role/DocumentAndEntityInformation">
        <link:definition>0000001 - Document - Document And Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.sunocolp.com/role/ConsolidatedBalanceSheets">
        <link:definition>9952151 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.sunocolp.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>9952152 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperations" roleURI="http://www.sunocolp.com/role/ConsolidatedStatementsofOperations">
        <link:definition>9952153 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementofComprehensiveIncomeStatement" roleURI="http://www.sunocolp.com/role/StatementofComprehensiveIncomeStatement">
        <link:definition>9952154 - Statement - Statement of Comprehensive Income (Statement)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofEquity" roleURI="http://www.sunocolp.com/role/ConsolidatedStatementofEquity">
        <link:definition>9952155 - Statement - Consolidated Statement of Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlows" roleURI="http://www.sunocolp.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>9952156 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationandPrinciplesofConsolidation" roleURI="http://www.sunocolp.com/role/OrganizationandPrinciplesofConsolidation">
        <link:definition>9952157 - Disclosure - Organization and Principles of Consolidation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPolicies" roleURI="http://www.sunocolp.com/role/SummaryofSignificantAccountingPolicies">
        <link:definition>9952158 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDivestituresandOtherTransactions" roleURI="http://www.sunocolp.com/role/AcquisitionsDivestituresandOtherTransactions">
        <link:definition>9952159 - Disclosure - Acquisitions, Divestitures and Other Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CashandCashEquivalents" roleURI="http://www.sunocolp.com/role/CashandCashEquivalents">
        <link:definition>9952160 - Disclosure - Cash and Cash Equivalents</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountsReceivablenet" roleURI="http://www.sunocolp.com/role/AccountsReceivablenet">
        <link:definition>9952161 - Disclosure - Accounts Receivable, net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventoriesnet" roleURI="http://www.sunocolp.com/role/Inventoriesnet">
        <link:definition>9952162 - Disclosure - Inventories, net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinUnconsolidatedAffiliates" roleURI="http://www.sunocolp.com/role/InvestmentinUnconsolidatedAffiliates">
        <link:definition>9952163 - Disclosure - Investment in Unconsolidated Affiliates</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedExpensesandOtherCurrentLiabilities" roleURI="http://www.sunocolp.com/role/AccruedExpensesandOtherCurrentLiabilities">
        <link:definition>9952164 - Disclosure - Accrued Expenses and Other Current Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtObligations" roleURI="http://www.sunocolp.com/role/DebtObligations">
        <link:definition>9952165 - Disclosure - Debt Obligations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherNoncurrentLiabilitiesNotes" roleURI="http://www.sunocolp.com/role/OtherNoncurrentLiabilitiesNotes">
        <link:definition>9952166 - Disclosure - Other Noncurrent Liabilities (Notes)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactions" roleURI="http://www.sunocolp.com/role/RelatedPartyTransactions">
        <link:definition>9952167 - Disclosure - Related-Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueNotes" roleURI="http://www.sunocolp.com/role/RevenueNotes">
        <link:definition>9952168 - Disclosure - Revenue (Notes)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingencies" roleURI="http://www.sunocolp.com/role/CommitmentsAndContingencies">
        <link:definition>9952169 - Disclosure - Commitments And Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Equity" roleURI="http://www.sunocolp.com/role/Equity">
        <link:definition>9952170 - Disclosure - Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentReporting" roleURI="http://www.sunocolp.com/role/SegmentReporting">
        <link:definition>9952171 - Disclosure - Segment Reporting</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeperCommonUnit" roleURI="http://www.sunocolp.com/role/NetIncomeperCommonUnit">
        <link:definition>9952172 - Disclosure - Net Income per Common Unit</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsandHedgingActivities" roleURI="http://www.sunocolp.com/role/DerivativeInstrumentsandHedgingActivities">
        <link:definition>9952173 - Disclosure - Derivative Instruments and Hedging Activities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPoliciesPolicies" roleURI="http://www.sunocolp.com/role/SummaryofSignificantAccountingPoliciesPolicies">
        <link:definition>9955511 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoryPolicies" roleURI="http://www.sunocolp.com/role/InventoryPolicies">
        <link:definition>9955512 - Disclosure - Inventory (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenuefromContractwithCustomerPolicies" roleURI="http://www.sunocolp.com/role/RevenuefromContractwithCustomerPolicies">
        <link:definition>9955513 - Disclosure - Revenue from Contract with Customer (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityPolicies" roleURI="http://www.sunocolp.com/role/EquityPolicies">
        <link:definition>9955514 - Disclosure - Equity (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsandHedgingActivitiesPolicies" roleURI="http://www.sunocolp.com/role/DerivativeInstrumentsandHedgingActivitiesPolicies">
        <link:definition>9955515 - Disclosure - Derivative Instruments and Hedging Activities (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesTables" roleURI="http://www.sunocolp.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesTables">
        <link:definition>9955516 - Disclosure - Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDivestituresandOtherTransactionsTables" roleURI="http://www.sunocolp.com/role/AcquisitionsDivestituresandOtherTransactionsTables">
        <link:definition>9955517 - Disclosure - Acquisitions, Divestitures and Other Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CashandCashEquivalentsTables" roleURI="http://www.sunocolp.com/role/CashandCashEquivalentsTables">
        <link:definition>9955518 - Disclosure - Cash and Cash Equivalents (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountsReceivablenetTables" roleURI="http://www.sunocolp.com/role/AccountsReceivablenetTables">
        <link:definition>9955519 - Disclosure - Accounts Receivable, net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesnetTables" roleURI="http://www.sunocolp.com/role/InventoriesnetTables">
        <link:definition>9955520 - Disclosure - Inventories, net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinUnconsolidatedAffiliatesTables" roleURI="http://www.sunocolp.com/role/InvestmentinUnconsolidatedAffiliatesTables">
        <link:definition>9955521 - Disclosure - Investment in Unconsolidated Affiliates (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedExpensesandOtherCurrentLiabilitiesTables" roleURI="http://www.sunocolp.com/role/AccruedExpensesandOtherCurrentLiabilitiesTables">
        <link:definition>9955522 - Disclosure - Accrued Expenses and Other Current Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtObligationsTables" roleURI="http://www.sunocolp.com/role/DebtObligationsTables">
        <link:definition>9955523 - Disclosure - Debt Obligations (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherNoncurrentLiabilitiesTables" roleURI="http://www.sunocolp.com/role/OtherNoncurrentLiabilitiesTables">
        <link:definition>9955524 - Disclosure - Other Noncurrent Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsTables" roleURI="http://www.sunocolp.com/role/RelatedPartyTransactionsTables">
        <link:definition>9955525 - Disclosure - Related-Party Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueTables" roleURI="http://www.sunocolp.com/role/RevenueTables">
        <link:definition>9955526 - Disclosure - Revenue (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesTables" roleURI="http://www.sunocolp.com/role/CommitmentsAndContingenciesTables">
        <link:definition>9955527 - Disclosure - Commitments And Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityTables" roleURI="http://www.sunocolp.com/role/EquityTables">
        <link:definition>9955528 - Disclosure - Equity (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentReportingTables" roleURI="http://www.sunocolp.com/role/SegmentReportingTables">
        <link:definition>9955529 - Disclosure - Segment Reporting (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeperCommonUnitTables" roleURI="http://www.sunocolp.com/role/NetIncomeperCommonUnitTables">
        <link:definition>9955530 - Disclosure - Net Income per Common Unit (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsandHedgingActivitiesTables" roleURI="http://www.sunocolp.com/role/DerivativeInstrumentsandHedgingActivitiesTables">
        <link:definition>9955531 - Disclosure - Derivative Instruments and Hedging Activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationandPrinciplesofConsolidationAdditionalInformationDetails" roleURI="http://www.sunocolp.com/role/OrganizationandPrinciplesofConsolidationAdditionalInformationDetails">
        <link:definition>9955532 - Disclosure - Organization and Principles of Consolidation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofSignificantAccountingPoliciesAdditionalInformationDetails" roleURI="http://www.sunocolp.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails">
        <link:definition>9955533 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsDivestituresandOtherTransactionsDetails" roleURI="http://www.sunocolp.com/role/AcquisitionsDivestituresandOtherTransactionsDetails">
        <link:definition>9955534 - Disclosure - Acquisitions, Divestitures and Other Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CashandCashEquivalentsDetails" roleURI="http://www.sunocolp.com/role/CashandCashEquivalentsDetails">
        <link:definition>9955535 - Disclosure - Cash and Cash Equivalents (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccountsReceivablenetDetails" roleURI="http://www.sunocolp.com/role/AccountsReceivablenetDetails">
        <link:definition>9955536 - Disclosure - Accounts Receivable, net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesnetAdditionalInformationDetails" roleURI="http://www.sunocolp.com/role/InventoriesnetAdditionalInformationDetails">
        <link:definition>9955537 - Disclosure - Inventories, net - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesnetDetails" roleURI="http://www.sunocolp.com/role/InventoriesnetDetails">
        <link:definition>9955538 - Disclosure - Inventories, net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentinUnconsolidatedAffiliatesDetails" roleURI="http://www.sunocolp.com/role/InvestmentinUnconsolidatedAffiliatesDetails">
        <link:definition>9955539 - Disclosure - Investment in Unconsolidated Affiliates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleofInvestmentinUnconsolidatedAffiliatesDetails" roleURI="http://www.sunocolp.com/role/ScheduleofInvestmentinUnconsolidatedAffiliatesDetails">
        <link:definition>9955540 - Disclosure - Schedule of Investment in Unconsolidated Affiliates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedExpensesandOtherCurrentLiabilitiesDetails" roleURI="http://www.sunocolp.com/role/AccruedExpensesandOtherCurrentLiabilitiesDetails">
        <link:definition>9955541 - Disclosure - Accrued Expenses and Other Current Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtObligationsDetails" roleURI="http://www.sunocolp.com/role/DebtObligationsDetails">
        <link:definition>9955542 - Disclosure - Debt Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtObligationsRevolvingCreditAgreementDetails" roleURI="http://www.sunocolp.com/role/DebtObligationsRevolvingCreditAgreementDetails">
        <link:definition>9955543 - Disclosure - Debt Obligations (Revolving Credit Agreement) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtObligationsFairValueMeasurementsDetails" roleURI="http://www.sunocolp.com/role/DebtObligationsFairValueMeasurementsDetails">
        <link:definition>9955544 - Disclosure - Debt Obligations (Fair Value Measurements) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherNoncurrentLiabilitiesDetails" roleURI="http://www.sunocolp.com/role/OtherNoncurrentLiabilitiesDetails">
        <link:definition>9955545 - Disclosure - Other Noncurrent Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsDetails" roleURI="http://www.sunocolp.com/role/RelatedPartyTransactionsDetails">
        <link:definition>9955546 - Disclosure - Related-Party Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueDisaggregationofRevenueDetails" roleURI="http://www.sunocolp.com/role/RevenueDisaggregationofRevenueDetails">
        <link:definition>9955547 - Disclosure - Revenue (Disaggregation of Revenue) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueContractBalanceswithCustomerDetails" roleURI="http://www.sunocolp.com/role/RevenueContractBalanceswithCustomerDetails">
        <link:definition>9955548 - Disclosure - Revenue (Contract Balances with Customer) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRemainingPerformanceObligationDetails" roleURI="http://www.sunocolp.com/role/RevenueRemainingPerformanceObligationDetails">
        <link:definition>9955549 - Disclosure - Revenue - Remaining Performance Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRemainingPerformanceObligationDetails_1" roleURI="http://www.sunocolp.com/role/RevenueRemainingPerformanceObligationDetails_1">
        <link:definition>9955549 - Disclosure - Revenue - Remaining Performance Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsAndContingenciesDetails" roleURI="http://www.sunocolp.com/role/CommitmentsAndContingenciesDetails">
        <link:definition>9955550 - Disclosure - Commitments And Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityDetails" roleURI="http://www.sunocolp.com/role/EquityDetails">
        <link:definition>9955551 - Disclosure - Equity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityScheduleofCommonUnitsDetails" roleURI="http://www.sunocolp.com/role/EquityScheduleofCommonUnitsDetails">
        <link:definition>9955552 - Disclosure - Equity (Schedule of Common Units) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EquityCashDistributionsDetails" roleURI="http://www.sunocolp.com/role/EquityCashDistributionsDetails">
        <link:definition>9955553 - Disclosure - Equity (Cash Distributions) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentReportingDetails" roleURI="http://www.sunocolp.com/role/SegmentReportingDetails">
        <link:definition>9955554 - Disclosure - Segment Reporting (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomeperCommonUnitDetails" roleURI="http://www.sunocolp.com/role/NetIncomeperCommonUnitDetails">
        <link:definition>9955555 - Disclosure - Net Income per Common Unit (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsandHedgingActivitiesDetails" roleURI="http://www.sunocolp.com/role/DerivativeInstrumentsandHedgingActivitiesDetails">
        <link:definition>9955556 - Disclosure - Derivative Instruments and Hedging Activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeInstrumentsandHedgingActivitiesDetails_1" roleURI="http://www.sunocolp.com/role/DerivativeInstrumentsandHedgingActivitiesDetails_1">
        <link:definition>9955556 - Disclosure - Derivative Instruments and Hedging Activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="sunc_CommonUnitsMember" abstract="true" name="CommonUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_ClassCUnitsMember" abstract="true" name="ClassCUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_SalesRevenueMember" abstract="true" name="SalesRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_ServiceRevenueMember" abstract="true" name="ServiceRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_LeaseRevenueMember" abstract="true" name="LeaseRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_NetIncomeLossAttributableToPredecessorEquity" abstract="false" name="NetIncomeLossAttributableToPredecessorEquity" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_ComprehensiveIncomeAttributableToPredecessorEquity" abstract="false" name="ComprehensiveIncomeAttributableToPredecessorEquity" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_CommonUnitholdersMember" abstract="true" name="CommonUnitholdersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_PredecessorEquityMember" abstract="true" name="PredecessorEquityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_CashDistributionsToUnitHoldersIncludingIncentiveDistributions" abstract="false" name="CashDistributionsToUnitHoldersIncludingIncentiveDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_OtherAcquisitionsMember" abstract="true" name="OtherAcquisitionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_TanQuidMember" abstract="true" name="TanQuidMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_DeltaAcquisitionMember" abstract="true" name="DeltaAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_GoZoneBondsMember" abstract="true" name="GoZoneBondsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_CreditFacilityMember" abstract="true" name="CreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_CashDistributionsToPredecessorEquityIncludingIncentiveDistributions" abstract="false" name="CashDistributionsToPredecessorEquityIncludingIncentiveDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_AccruedExpensesAndOtherCurrentLiabilitiesAbstract" abstract="true" name="AccruedExpensesAndOtherCurrentLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_NetIncomePerUnitAbstract" abstract="true" name="NetIncomePerUnitAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_MotorFuelAndSalesTaxesPolicyPolicyTextBlock" abstract="false" name="MotorFuelAndSalesTaxesPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sunc_SunocoLPMember" abstract="true" name="SunocoLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" abstract="true" name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="sunc_EnergyTransferMember" abstract="true" name="EnergyTransferMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_SunocoGPLLCGeneralPartnerMember" abstract="true" name="SunocoGPLLCGeneralPartnerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_TerminalsMember" abstract="true" name="TerminalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_SunocoBrandedLocationsMember" abstract="true" name="SunocoBrandedLocationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" abstract="true" name="OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_NumberOfTerminalsOwned" abstract="false" name="NumberOfTerminalsOwned" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_NumberOfBrandedLocations" abstract="false" name="NumberOfBrandedLocations" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_MilesOfPipeline" abstract="false" name="MilesOfPipeline" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_GallonsDistributedAnnually" abstract="false" name="GallonsDistributedAnnually" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_MotorFuelTaxesIncludedInMotorFuelSalesAndCostOfSalesMember" abstract="true" name="MotorFuelTaxesIncludedInMotorFuelSalesAndCostOfSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_U.S.BasedFuelDistributionNetworkMember" abstract="true" name="U.S.BasedFuelDistributionNetworkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_FairValueOfDebtAssumedMember" abstract="true" name="FairValueOfDebtAssumedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_CaribbeanMember" abstract="true" name="CaribbeanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_NumberOfFuelTerminals" abstract="false" name="NumberOfFuelTerminals" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_ETSPermianMember" abstract="true" name="ETSPermianMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_OtherAcquisitionMember" abstract="true" name="OtherAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_OtherReceivablesMember" abstract="true" name="OtherReceivablesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_EffectOfLIFOInventoryLiquidationOnIncomePerCommonUnit" abstract="false" name="EffectOfLIFOInventoryLiquidationOnIncomePerCommonUnit" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="sunc_J.C.NolanJointVentureMember" abstract="true" name="J.C.NolanJointVentureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_SARAMember" abstract="true" name="SARAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_IslaMember" abstract="true" name="IslaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_NumberOfRetailLocations" abstract="false" name="NumberOfRetailLocations" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_ThroughputCapacity" abstract="false" name="ThroughputCapacity" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_StorageCapacity" abstract="false" name="StorageCapacity" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_CrudeOilStorageCapacityMeasuredInBarrels" abstract="false" name="CrudeOilStorageCapacityMeasuredInBarrels" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_OtherMember" abstract="true" name="OtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_AccruedCapitalExpenditures" abstract="false" name="AccruedCapitalExpenditures" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_A600SeniorNotesDue2027Member" abstract="true" name="A600SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5875SeniorNotesDue2028Member" abstract="true" name="A5875SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A45SeniorNotesDue2029Member" abstract="true" name="A45SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A45SeniorNotesDue2030Member" abstract="true" name="A45SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A700SeniorNotesDue2028Member" abstract="true" name="A700SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A7.25SeniorNotesDue2032Member" abstract="true" name="A7.25SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A6.00SeniorNotesDue2026Member" abstract="true" name="A6.00SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5.625SeniorNotesDue2027Member" abstract="true" name="A5.625SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A7.00SeniorNotesDue2029Member" abstract="true" name="A7.00SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A6.375SeniorNotesDue2030Member" abstract="true" name="A6.375SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series2008Member" abstract="true" name="Series2008Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series2010Member" abstract="true" name="Series2010Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series2010AMember" abstract="true" name="Series2010AMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series2010BMember" abstract="true" name="Series2010BMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A6.250SeniorNotesDue2033Member" abstract="true" name="A6.250SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5.625SeniorNotesDue2031Member" abstract="true" name="A5.625SeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5.875SeniorNotesDue2034Member" abstract="true" name="A5.875SeniorNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series2011Member" abstract="true" name="Series2011Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A3.875CADSeniorNotesDue2026Member" abstract="true" name="A3.875CADSeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland3.875CADSeniorNotesDue2026Member" abstract="true" name="Parkland3.875CADSeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5.875SeniorNotesDue2027Member" abstract="true" name="A5.875SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland5.875SeniorNotesDue2027Member" abstract="true" name="Parkland5.875SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A6.000CADSeniorNotesDue2028Member" abstract="true" name="A6.000CADSeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland6.000CADSeniorNotesDue2029Member" abstract="true" name="Parkland6.000CADSeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A4.375CADSeniorNotesDue2029Member" abstract="true" name="A4.375CADSeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland4.375CADSeniorNotesDue2029Member" abstract="true" name="Parkland4.375CADSeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A4.500SeniorNotesDue2029Member" abstract="true" name="A4.500SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland4.500SeniorNotesDue2029Member" abstract="true" name="Parkland4.500SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A4.625SeniorNotesDue2030Member" abstract="true" name="A4.625SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland4.625SeniorNotesDue2030Member" abstract="true" name="Parkland4.625SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5.375SeniorNotesDue2031Member" abstract="true" name="A5.375SeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A6.625SeniorNotesDue2032Member" abstract="true" name="A6.625SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Parkland6.625SeniorNotesDue2032Member" abstract="true" name="Parkland6.625SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_A5.625SeniorNotesDue2034Member" abstract="true" name="A5.625SeniorNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_DueBeforeMarch312027ClassifiedAsLongTermMember" abstract="true" name="DueBeforeMarch312027ClassifiedAsLongTermMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_RevolvingCreditFacilityDueJune2030Member" abstract="true" name="RevolvingCreditFacilityDueJune2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series20082010BAnd2010Member" abstract="true" name="Series20082010BAnd2010Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Series2010And2010AMember" abstract="true" name="Series2010And2010AMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_DebtInstrumentCovenantLeverageRatioMaximum" abstract="false" name="DebtInstrumentCovenantLeverageRatioMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sunc_NuStarCreditFacilityMember" abstract="true" name="NuStarCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_FairValueMeasurementsAbstract" abstract="true" name="FairValueMeasurementsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_WholesalemotorfuelsalestoaffiliatesMember" abstract="true" name="WholesalemotorfuelsalestoaffiliatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_WholesaleMotorFuelMember" abstract="true" name="WholesaleMotorFuelMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_LeaseIncomeMember" abstract="true" name="LeaseIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_NonFuelMember" abstract="true" name="NonFuelMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_PipelineThroughputMember" abstract="true" name="PipelineThroughputMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_TerminalThroughputMember" abstract="true" name="TerminalThroughputMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_RefineryMember" abstract="true" name="RefineryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_NewYorkMotorFuelExciseTaxAuditMember" abstract="true" name="NewYorkMotorFuelExciseTaxAuditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_InsuranceCoveragePerOccurrence" abstract="false" name="InsuranceCoveragePerOccurrence" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_ScheduleOfPartnersCapitalTable" abstract="true" name="ScheduleOfPartnersCapitalTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="sunc_ClassDUnitsMember" abstract="true" name="ClassDUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_ScheduleOfPartnersCapitalLineItems" abstract="true" name="ScheduleOfPartnersCapitalLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sunc_A7.875SeriesAFixedRateResetCumulativeRedeemablePerpetualPreferredMember" abstract="true" name="A7.875SeriesAFixedRateResetCumulativeRedeemablePerpetualPreferredMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_DistributionToIDRHoldersMember" abstract="true" name="DistributionToIDRHoldersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_FuelDistributionMember" abstract="true" name="FuelDistributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_PipelineSystemsMember" abstract="true" name="PipelineSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_RevenuesFromExternalCustomersMember" abstract="true" name="RevenuesFromExternalCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_IntersegmentRevenuesMember" abstract="true" name="IntersegmentRevenuesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_GreaterCaribbeanAreaMember" abstract="true" name="GreaterCaribbeanAreaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_ContinentalUnitedStatesMember" abstract="true" name="ContinentalUnitedStatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sunc_Othernoncashadjustments" abstract="false" name="Othernoncashadjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_AdjustedEBITDA" abstract="false" name="AdjustedEBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_AdjustedEBITDARelatedToUnconsolidatedAffiliates" abstract="false" name="AdjustedEBITDARelatedToUnconsolidatedAffiliates" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_OperatingExpensesExcludingNonCashUnitBasedCompensation" abstract="false" name="OperatingExpensesExcludingNonCashUnitBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_GeneralAndAdministrativeExpenseExcludingNonCashUnitBasedCompensation" abstract="false" name="GeneralAndAdministrativeExpenseExcludingNonCashUnitBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_Other" abstract="false" name="Other" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sunc_NumberOfMilesOfRefinedProductPipeline" abstract="false" name="NumberOfMilesOfRefinedProductPipeline" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_NumberOfMilesOfCrudeOilPipeline" abstract="false" name="NumberOfMilesOfCrudeOilPipeline" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_NumberOfMilesOfAmmoniaPipeline" abstract="false" name="NumberOfMilesOfAmmoniaPipeline" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_NumberOfTerminals" abstract="false" name="NumberOfTerminals" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_NumberOfTransmixProcessingFacilities" abstract="false" name="NumberOfTransmixProcessingFacilities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_NumberOfRefinedProductTerminals" abstract="false" name="NumberOfRefinedProductTerminals" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_OperationalCapacityPerDayNumberOfBarrels" abstract="false" name="OperationalCapacityPerDayNumberOfBarrels" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sunc_December2030Member" abstract="true" name="December2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
