GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Envoy - 2WD 🢒 Engine 🢒 Engine Controls - 4.8L, 5.3L, and 6.0L 🢒 Fuel Pressure Regulator Replacement

Removal Procedure

    Object Number: 350543 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Disconnect the fuel pressure regulator vacuum line.
  3. Clean any dirt from the fuel pressure regulator retainer and the surrounding area.
  4. Remove the fuel pressure regulator retainer (8).
  5. Remove the fuel pressure regulator (9).
  6. Ensure non of the following parts are still in the fuel rail.
    7. • Backup ring (10)
    • Regulator seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)

Installation Procedure

    Object Number: 350543 Size: SH
  1. Install the following parts onto the fuel pressure regulator (9), if necessary.
    2. • Backup ring (10)
    • Regulator seal O-ring (11)
    • Regulator filter (12)
    • Regulator seal O-ring (13)
  2. Lubricate the fuel pressure regulator large O-rings (11, 13) with clean engine oil.
  3. Install the fuel pressure regulator (9).
  4. Install a NEW fuel pressure regulator retainer (8).
  5. Connect the fuel pressure regulator vacuum line.
  6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  7. Install the fuel fill cap.
  8. Inspect for leaks.
    9. 8.1. Turn the ignition ON, for 2 seconds.
    8.2. Turn the ignition OFF for 10 seconds.
    8.3. Turn the ignition ON.
    8.4. Inspect for fuel leaks.