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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 T/qvtkWXaF5Dxvzop2HAr5HSY+RW+0DIjESB30Qcc/B4I2862AUKwIxaP2pr9TQK
 y74mJUpB+aGsKj70oIgbXg==

<SEC-DOCUMENT>0001179110-04-017614.txt : 20040903
<SEC-HEADER>0001179110-04-017614.hdr.sgml : 20040903
<ACCEPTANCE-DATETIME>20040903151137
ACCESSION NUMBER:		0001179110-04-017614
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040901
FILED AS OF DATE:		20040903
DATE AS OF CHANGE:		20040903

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PACIFIC ENERGY PARTNERS LP
		CENTRAL INDEX KEY:			0001168397
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				680490580

	MAIL ADDRESS:	
		STREET 1:		5900 CHERRY AVE
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90805 4405

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BOARTS LYLE B
		CENTRAL INDEX KEY:			0001280269

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31345
		FILM NUMBER:		041016721

	BUSINESS ADDRESS:	
		STREET 1:		6900 CHERRY AVE
		CITY:			LONG BEACH
		STATE:			CA
		ZIP:			90605-4408
		BUSINESS PHONE:		5627282872
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-09-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001168397</issuerCik>
        <issuerName>PACIFIC ENERGY PARTNERS LP</issuerName>
        <issuerTradingSymbol>PPX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001280269</rptOwnerCik>
            <rptOwnerName>BOARTS LYLE B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5900 CHERRY AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LONG BEACH</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90805</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President-Human Resources</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
            </securityTitle>
            <transactionDate>
                <value>2004-09-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>343.4111</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28.050</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8372.1154</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>Referencing 5.&quot;Relationship of Reporting Person(s) to Issuer&quot; - the title shown for Mr. Boarts is with Pacific Energy GP, Inc., general partner of the Issuer.</remarks>

    <ownerSignature>
        <signatureName>Lyle B. Boarts</signatureName>
        <signatureDate>2004-09-03</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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