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Home >> GMC >> 2002 >> C3500 HD 8.1 G, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 8.1L >> Repair Instructions >> Fuel Pressure Regulator Replacement >> Installation Procedure
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Installation Procedure

  1. Install the backup ring (10) on the fuel pressure regulator (8).
  2. Install the new large O-ring (11) on the fuel pressure regulator.
  3. Install the regulator filter (12) on the fuel pressure regulator.
  4. Install the new small O-ring (13) on the fuel pressure regulator.
  5. Lubricate the fuel pressure regulator large O-ring and the small O-ring with clean engine oil.
  6. Push the fuel pressure regulator into the regulator housing on the fuel rail.
  7. Install a new fuel pressure regulator retainer (9).
    Fig 1: Fuel Pressure Regulator & Retainer
    G01598970Courtesy of GENERAL MOTORS CORP.
  8. Connect the fuel pressure regulator vacuum line (1).
  9. Connect the negative battery cable.
  10. Tighten the fuel filler cap.
  11. Inspect for leaks.
    1. 11.1. Turn ON the ignition for 2 seconds.
    2. 11.2. Turn OFF the ignition for 10 seconds.
    3. 11.3. Turn ON the ignition.
    4. 11.4. Inspect for fuel leaks.
    Fig 2: Fuel Pressure Regulator Vacuum Line
    G01598971Courtesy of GENERAL MOTORS CORP.
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