Schedule 13G


                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No.)*

                          Pacific Energy Partners, L.P.
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                                (Name of Issuer)

               Common Units representing limited partner interests
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                         (Title of Class of Securities)

                                    69422R105
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                                 (CUSIP Number)

                               September 30, 2005
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             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [X] Rule 13d-1(b)
         [ ] Rule 13d-1(c)
         [ ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act, but shall be subject to all other provisions of the Act (however, see the
Notes).




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CUSIP No.     69422R105
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-------------------- -----------------------------------------------------------

         1           NAME OF REPORTING PERSON
                     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only)

                     Tortoise Capital Advisors LLC (22-3875939)
-------------------- -----------------------------------------------------------

         2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                     (a) [    ]

                     (b) [ X  ]

                     (See Instructions)
-------------------- -----------------------------------------------------------

         3           SEC USE ONLY

-------------------- -----------------------------------------------------------

         4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware

-------------------- ------------- ---------------------------------------------

                          5        SOLE VOTING POWER
 NUMBER OF SHARES
BENEFICIALLY OWNED                 0
 BY EACH REPORTING
      PERSON
       WITH:         ------------- ---------------------------------------------

                          6        SHARED VOTING POWER

                                   2,754,643 (see Item 4)
                     ------------- ---------------------------------------------

                          7        SOLE DISPOSITIVE POWER

                                   0
                     ------------- ---------------------------------------------

                          8        SHARED DISPOSITIVE POWER

                                   2,843,899 (see Item 4)
-------------------- ------------- ---------------------------------------------

         9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                     2,843,899 (see Item 4)

-------------------- -----------------------------------------------------------

        10           CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN
                     SHARES (See Instructions)

                     Not Applicable

-------------------- -----------------------------------------------------------

        11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                     10.5%

-------------------- -----------------------------------------------------------

        12           TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                     IA

--------------------------------------------------------------------------------




--------------------------------------------------------------------------------
CUSIP No.     69422R105
--------------------------------------------------------------------------------


-------------------- -----------------------------------------------------------

         1           NAME OF REPORTING PERSON
                     I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only)

                     Tortoise Energy Capital Corporation (20-2721018)
-------------------- -----------------------------------------------------------

         2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                     (a) [    ]
                     (b) [ X  ]

                     (See Instructions)

-------------------- -----------------------------------------------------------

         3           SEC USE ONLY

-------------------- -----------------------------------------------------------

         4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Maryland

-------------------- ------------- ---------------------------------------------

                          5        SOLE VOTING POWER
 NUMBER OF SHARES
BENEFICIALLY OWNED                 0
 BY EACH REPORTING
      PERSON
       WITH:         ------------- ---------------------------------------------

                          6        SHARED VOTING POWER

                                   1,617,500 (see Item 4)

                     ------------- ---------------------------------------------

                          7        SOLE DISPOSITIVE POWER

                                   0

                     ------------- ---------------------------------------------

                          8        SHARED DISPOSITIVE POWER

                                   1,617,500 (see Item 4)

-------------------- -----------------------------------------------------------

         9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                     1,617,500 (see Item 4)

-------------------- -----------------------------------------------------------

        10           CHECK IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN
                     SHARES (See Instructions)

                     Not Applicable

-------------------- -----------------------------------------------------------

        11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                     6.0%

-------------------- -----------------------------------------------------------

        12           TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                     IV
-------------------- -----------------------------------------------------------




Item 1(a) Name of Issuer:

     Pacific Energy Partners, L.P.

Item 1(b) Address of Issuer's Principal Executive Offices:

     5900 Cherry Avenue, Long Beach, CA 90805-4405

Item 2(a) Name of Persons Filing:

     This 13G is being  jointly  filed  by  Tortoise  Capital  Advisors  LLC,  a
Delaware  limited  liability  company  ("TCA"),   and  Tortoise  Energy  Capital
Corporation, a Maryland corporation ("TYY").

     TCA and TYY have entered into an  Agreement  Regarding  Joint Filing of 13G
dated  October  7, 2005  (the  "Agreement")  pursuant  to which TCA and TYY have
agreed  to file this 13G  jointly  in  accordance  with the  provisions  of Rule
13d-1(k)(1)  of the Securities  Exchange Act of 1940, as amended (the "Act").  A
copy of the Agreement is attached hereto as Exhibit A.

Item 2(b) Address of Principal Business Office or, if None, Residence:

     The principal  business  address of both TCA and TYY is 10801 Mastin Blvd.,
Suite 222, Overland Park, Kansas 66210.

Item 2(c) Citizenship:

     TCA  is a  Delaware  limited  liability  company  and  TYY  is  a  Maryland
corporation.

Item 2(d) Title of Class of Securities:

     Common Units representing limited partner interests

Item 2(e) CUSIP Number:

     69422R105

Item 3 The Reporting Person is:

     TCA is an investment adviser in accordance with ss.  240.13d-1(b)(1)(ii)(E)
and TYY is an investment  company  registered  under Section 8 of the Investment
Company Act of 1940 (15 U.S.C. 80a-8).

Item 4 Ownership:

     TCA acts as an investment  advisor to TYY, a closed-end  investment company
registered  under  the  Investment  Company  Act of 1940.  TCA,  by virtue of an
Investment Advisory Agreement with TYY, has all investment and voting power over
securities owned of record by TYY. However, despite its delegation of investment
and voting power to TCA, TYY may be deemed to be the beneficial owner under Rule
13d-3 of the Act, of the  securities it owns of record  because it has the right
to acquire  investment  and voting power through  termination  of the Investment
Advisory Agreement. Thus, TCA and TYY have reported that they share voting power
and dispositive power over the securities owned of record by TYY. In addition to
acting as an investment  advisor to TYY, TCA also acts as an investment  advisor
to Tortoise Energy Infrastructure  Corporation,  a closed-end investment company
registered under the Investment  Company Act of 1940





("TYG").  TCA, by virtue of an Investment  Advisory  Agreement with TYG, has all
investment  and voting power over  securities  owned of record by TYG.  However,
despite its  delegation of investment and voting power to TCA, TYG may be deemed
to be the  beneficial  owner under Rule 13d-3 of the Act, of the  securities  it
owns of record  because it has the right to acquire  investment and voting power
through termination of the Investment Advisory Agreement. Thus, TCA has reported
that it shares voting power and dispositive  power over the securities  owned of
record  by TYG.  TCA also  acts as an  investment  advisor  to  certain  managed
accounts.  Under contractual  agreements with individual  account holders,  TCA,
with respect to the securities held in the managed  accounts,  shares investment
and voting  power with  certain  account  holders,  and has no voting  power but
shares  investment power with certain other account  holders.  TCA may be deemed
the  beneficial  owner of the securities  covered by this  statement  under Rule
13d-3 of the Act.  None of the  securities  listed  below are owned of record by
TCA, and TCA disclaims any beneficial interest in such shares.

A.   Tortoise Capital Advisors

     (a)  Amount beneficially owned: 2,843,899

     (b)  Percent of class: 10.5%

     (c)  Number of shares as to which the person has:

          (i)  Sole power to vote or to direct the vote: 0

          (ii) Shared power to vote or direct the vote: 2,754,643

          (iii) Sole power to dispose or to direct the disposition of: 0

          (iv) Shared  power  to  dispose  or  to  direct  the  disposition  of:
               2,843,899

B.   Tortoise Energy Capital Corporation

     (a)  Amount beneficially owned: 1,617,500

     (b)  Percent of class: 6.0%

     (c)  Number of shares as to which the person has:

          (i)  Sole power to vote or to direct the vote: 0

          (ii) Shared power to vote or direct the vote: 1,617,500

          (iii) Sole power to dispose or to direct the disposition of: 0

          (iv) Shared  power  to  dispose  or  to  direct  the  disposition  of:
               1,617,500

Item 5 Ownership of Five Percent or Less of a Class:

     Not Applicable





Item 6 Ownership of More than Five Percent on Behalf of Another Person:

     TYY, TYG and the managed accounts  discussed in Item 4 above have the right
to receive all dividends from, and the proceeds from the sale of, the securities
held in their respective accounts.  Except for TYY, the interest of any one such
person does not exceed 5% of the class of securities.

Item 7 Identification  and  Classification  of the Subsidiary Which Acquired the
       Security Being Reported on By the Parent Holding Company:

     Not Applicable

Item 8 Identification and Classification of Members of the Group:

     Not Applicable

Item 9 Notice of Dissolution of Group:

     Not Applicable

Item 10 Certification:

     By signing  below I certify  that,  to the best of my knowledge and belief,
the  securities  referred to above were  acquired  and are held in the  ordinary
course of business  and were not acquired and are not held for the purpose of or
with the effect of  changing  or  influencing  the  control of the issuer of the
securities  and were not  acquired and are not held in  connection  with or as a
participant in any transaction having that purpose or effect.

                                    SIGNATURE

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated:  October 7, 2005

                                       Tortoise Capital Advisors LLC


                                       By:  /s/ Terry Matlack
                                          --------------------------------------
                                       Title:  Managing Director
                                             -----------------------------------

                                       Tortoise Energy Capital Corporation


                                       By:  /s/ Terry Matlack
                                          --------------------------------------
                                       Title:  CFO
                                             -----------------------------------





                                                                       Exhibit A

                  AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G

    In accordance with Rule 13d-1 (k) under the Securities Exchange Act of 1934,
as amended,  the undersigned agree to the joint filing on behalf of each of them
of a statement on Schedule 13G  (including  amendments  thereto) with respect to
the Common  Units  representing  limited  partner  interests  of Pacific  Energy
Partners,  L.P., and further agree that this agreement be included as an exhibit
to such filings.

   In  evidence  whereof,  the  undersigned  have caused  this  Agreement  to be
executed on their behalf this 7th day of October, 2005.



                                       Tortoise Capital Advisors LLC


                                       By:  /s/ Terry Matlack
                                          --------------------------------------
                                       Title:  Managing Director
                                             -----------------------------------

                                       Tortoise Energy Capital Corporation


                                       By:  /s/ Terry Matlack
                                          --------------------------------------
                                       Title:  CFO
                                             -----------------------------------