GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 Seville 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 Fuel Pressure Regulator Replacement

Removal Procedure

    Object Number: 682635 Size: SH
  1. Relieve the fuel pressure. Refer to Metal Collar Quick Connect Fitting Service .
  2. Clean any dirt from the fuel pressure regulator.
  3. Disconnect the fuel pressure regulator vacuum line.
  4. Remove the fuel pressure regulator retainer clip (7).
  5. Lift and twist the fuel pressure regulator (10) in order to remove the regulator from the fuel rail. Use a shop towel to catch any spilled fuel.
  6. Remove the regulator seal lower O-ring (8).
  7. Remove the regulator assembly filter.
  8. Remove the regulator seal upper O-ring (9).
  9. Remove the regulator seal back-up ring.
  10. Cover the fuel pressure regulator housing in order to prevent contaminates from entering the fuel system.

Installation Procedure

    Object Number: 682635 Size: SH
  1. Install new O-rings on the fuel pressure regulator if a new regulator is not being installed. Lubricate the O-rings lightly with clean engine oil.
  2. Install the back-up ring.
  3. Install the upper O-ring (9).
  4. Install the filter.
  5. Install the lower O-ring (8).
  6. Install the fuel pressure regulator retainer clip (7).
  7. Connect the fuel pressure regulator vacuum line.
  8. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  9. Perform the following procedure in order to inspect for leaks:
    10. 9.1. Turn ON the ignition, with the engine OFF for 2 seconds.
    9.2. Turn OFF the ignition for 10 seconds.
    9.3. Turn ON the ignition, with the engine OFF.
    9.4. Inspect for fuel leaks.
  10. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical .