GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2004 🢒 Century 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 Fuel Pressure Regulator Replacement

Removal Procedure

    Object Number: 22507 Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Disconnect the fuel pressure regulator vacuum line.
  3. Remove the fuel return pipe from the fuel pressure regulator.

    4. Object Number: 21133 Size: SH
  4. Remove the fuel pressure regulator screw.
  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 from the fuel rail.
  6. Remove the retainer and the spacer bracket from the fuel rail and discard.
  7. Remove the fuel pressure regulator inlet and the fuel return pipe O-rings, discard the O-rings.
  8. Inspect the filter screen for contamination. If contaminated, replace the fuel pressure regulator.

Installation Procedure

    Object Number: 22507 Size: SH

    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.

  1. Lubricate the new O-rings with clean engine oil and install the O-rings to the fuel pressure regulator.

    2. Caution: Connect the fuel return line before tightening the regulator attaching screw in order to prevent the regulator from rotating. Rotation of the regulator could damage the retainer and spacer bracket and lead to a fuel leak at the regulator inlet.

  2. Install the fuel return pipe to the fuel pressure regulator.

    3. Object Number: 21133 Size: SH
  3. Install the new retainer and the spacer bracket to the slot on the fuel rail.
  4. Install the fuel pressure regulator to the fuel rail.

    5. 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.

  5. Install the fuel pressure regulator screw.

    6. Tighten

    1. Tighten the engine fuel return pipe nut to 17 N·m (13 lb ft).
    2. Tighten the fuel pressure regulator screw to 8.5 N·m (75 lb in).
  6. Connect the fuel pressure regulator vacuum line.
  7. Verify that the retainer and spacer bracket is engaged in slots in fuel rail. Grasp and pull on the regulator to ensure that the regulator is properly seated.
  8. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  9. Inspect the fuel system for leaks by performing the following steps:
    10. 9.1. Turn ON the ignition switch for 2 seconds.
    9.2. Turn OFF the ignition switch for 10 seconds.
    9.3. Turn ON the ignition switch.
    9.4. Inspect for fuel leaks.