GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Controls - 8.1L 🢒 Fuel Pressure Regulator Replacement

Removal Procedure
  1. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim.
  2. Remove the air cleaner layer. Refer to Air Cleaner Replacement .

    3. Object Number: 665447 Size: SH
  3. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  4. Disconnect the fuel pressure regulator vacuum line (1).
  5. Clean any dirt from the fuel pressure regulator retainer and the surrounding area.

    6. Object Number: 705539 Size: SH
  6. Remove the fuel pressure regulator retainer (9).
  7. Remove the fuel pressure regulator (8) from the fuel pressure regulator housing.

Installation Procedure

    Object Number: 705539 Size: SH
  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).

    8. Object Number: 665447 Size: SH
  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.
    12. 11.1. Turn ON the ignition for 2 seconds.
    11.2. Turn OFF the ignition for 10 seconds.
    11.3. Turn ON the ignition.
    11.4. Inspect for fuel leaks.
  12. Install the air cleaner layer. Refer to Air Cleaner Replacement .
  13. Install the engine cover. Refer to Engine Cover Replacement in Interior Trim.