GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Fuel Pressure Regulator Replacement

Removal Procedure

Tools Required

J 34730 Fuel Pressure Gauge


    Object Number: 180378 Size: SH
  1. Relieve the fuel pressure. Refer to Fuel Pressure Relief .

    2. Object Number: 207599 Size: SH
  2. Clean any dirt from the fuel pressure regulator retaining ring.
  3. Remove the vacuum hose from fuel pressure regulator.

    4. Object Number: 12396 Size: SH
  4. Remove the snap ring (7).
  5. Using a shop towel to catch any spilled fuel, lift and twist the fuel pressure regulator in order to remove the fuel pressure regulator (6) from the fuel pressure regulator housing (1).
  6. Remove the regulator O-ring small (2).
  7. Remove the regulator filter screen (3).
  8. Remove the regulator O-ring large (4).
  9. Remove the regulator O-ring back up (5).
  10. Cover the fuel pressure regulator housing (1) to prevent contamination from entering the fuel system.

Installation Procedure

Notice: 

   • Do not use compressed air in order to test or clean a fuel pressure regulator as damage to the fuel pressure regulator may result.
   • Clean the fuel pressure regulator filter screen with gasoline if necessary.
   • Do not immerse the fuel pressure regulator in a solvent bath in order to prevent damage to the fuel pressure regulator.


    Object Number: 12396 Size: SH
  1. Install the new O-rings on the fuel pressure regulator (6), if a new fuel pressure regulator is not being installed. Lubricate the O-rings lightly with clean engine oil.
  2. Install the regulator back up O-ring (5).
  3. Install the regulator O-ring large (4).
  4. Install the regulator filter screen (3).
  5. Install the regulator O-ring small (2).
  6. Install the fuel pressure regulator (6) in the fuel pressure regulator housing (1).
  7. Install the snap ring (7).

    8. Object Number: 207599 Size: SH
  8. Install the vacuum hose to the fuel pressure regulator.
  9. Install the negative battery cable. Refer to Battery Cable in Engine Electrical.
  10. Inspect for leaks.
    11. 10.1. Turn the ignition switch to the On position for 2 seconds.
    10.2. Turn the ignition switch to the Off for 10 seconds.
    10.3. Turn the ignition switch to the On position.
    10.4. Check for fuel leaks.
  11. Install the rear seat cushion. Refer to Rear Seat Cushion Replacement in Body and Accessories.
  12. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement .

    13. Tighten
    Tighten the nut to 2 N·m (18 lb in).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.