GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Regal 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Fuel Pressure Regulator Replacement

Removal Procedure

Important: Always maintain cleanliness when servicing fuel system components.


    Object Number: 155470 Size: SH
  1. Relieve the fuel pressure. Refer to Fuel Pressure Relief .
  2. Clean any dirt from the fuel pressure regulator retaining ring.
  3. Remove the vacuum line from the pressure regulator.

    4. Object Number: 12396 Size: SH
  4. Remove the snap ring (3).
  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 (4) from the fuel pressure regulator housing (1).
  6. Remove the regulator O-ring small (7).
  7. Remove the regulator O-ring large (6).
  8. Remove the regulator O-ring back up (5).
  9. 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 (4), 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 (6).
  4. Install the regulator O-ring small (7).
  5. Install the fuel pressure regulator (4) in the fuel pressure regulator housing (1).
  6. Install the snap ring.

    7. Object Number: 155470 Size: SH
  7. Connect the vacuum line to the fuel pressure regulator.
  8. Tighten the fuel fill cap.
  9. Reconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in engine electrical.
  10. Inspect for leaks.
    11. 10.1. Turn the ignition switch ON for 2 seconds.
    10.2. Turn the ignition switch OFF for 10 seconds.
    10.3. Turn the ignition switch ON.
    10.4. Check for fuel leaks.
  11. Reinstall the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical.