SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM 8-K
                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                                   May 6, 2001
                        (Date of Earliest Event Reported)

                            SHAMROCK LOGISTICS, L.P.
             (Exact name of registrant as specified in its charter)



      Delaware                       001-16417                      74-2958817

  (State or other             (Commission File Number)            (IRS Employer
    jurisdiction                                                  Identification
 of incorporation)                                                   Number)


                            6000 North Loop 1604 West
                          San Antonio, Texas 78249-1112
                                  (210)592-2000
               (Address, including zip code, and telephone number)


Item 5.  Other Events.

                  On May 7,  2001,  Valero  Energy  Corporation  ("Valero")  and
Ultramar  Diamond  Shamrock  Corporation  ("UDS")  issued a joint press  release
announcing that Valero and UDS entered into an agreement and plan of merger (the
"Merger Agreement"),  dated as of May 6, 2001, pursuant to which UDS will merger
with and into Valero (the "Merger"),  and held an investor presentation relating
to the Merger.  A copy of the press release is attached  hereto as Exhibit 99.1.
Upon  completion  of the planned  merger,  Valero will become the obligor  under
agreements  Shamrock  Logistics,  L.P. has with UDS,  including its Pipeline and
Terminals Usage Agreement and Omnibus Agreement.

       99.1         Joint Press  Release, issued on May 7, 2001 by Valero Energy
                    Corporation and Ultramar Diamond Shamrock Corporation


                                   SIGNATURES

                  Pursuant to the requirements of the Securities Exchange Act of
1934,  the  registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.

                                          SHAMROCK LOGISTICS, L.P.



Date:  May 18, 2001                       By:  /s/Todd Walker
                                          Name:   Todd Walker
                                          Title   Secretary


                                  EXHIBIT INDEX

       99.1         Joint Press Release, issued on May 7, 2001  by Valero Energy
                    Corporation and Ultramar Diamond Shamrock Corporation