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Home › Cadillac › 2005 › Escalade EXT › Repair and Diagnosis › Engine Performance › System › Engine Control System - 4.8L, 5.3L & 6.0L - Introduction › Repair Instructions › Fuel Pressure Regulator Replacement (5.3L (L59) Engine) › Installation Procedure

Installation Procedure

    Fig 1: E85 Straight Vacuum Port Retainer & Tab (5.3L (L59) Engine)
    GM820979Courtesy of GENERAL MOTORS CORP.
  1. Ensure that the NEW fuel pressure regulator retainer is the correct one.
  2. The tab (1) is used on the E85-straight vacuum port retainer (3).
    3. Fig 2: Exploded View Of Fuel Rails & Injector Components
    GM350543Courtesy of GENERAL MOTORS CORP.
  3. Install the following parts onto the fuel pressure regulator (9), if necessary.
    • Backup ring (10)
    • Regulator seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)
  4. Lubricate the fuel pressure regulator O-rings (11, 13) with clean engine oil.
  5. Install the fuel pressure regulator (9).
    IMPORTANT: Whenever the fuel pressure regulator is removed from the fuel rail NEW O-rings and a NEW retaining clip should be used on reinstallation.
  6. Install the NEW fuel pressure regulator retainer (8).
  7. Install the fuel pressure regulator vacuum hose.
  8. Install the fuel fill cap.
  9. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  10. Use the following procedure in order to inspect for leaks:
    1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    2. Turn the ignition OFF for 10 seconds.
    3. Turn the ignition ON, with the engine OFF.
    4. Inspect for fuel leaks.
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