GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

    • J 34730-1A Fuel Pressure Gauge
    • J 39765 Fuel Sender Lock Nut Wrench

Caution: Fuel Vapors can collect while servicing fuel system parts in enclosed areas such as a trunk. To reduce the risk of fire and increased exposure to vapors:

   • Use forced air ventilation such as a fan set outside of the trunk.
   • Plug or cap any fuel system openings in order to reduce fuel vapor formation.
   • Clean up any spilled fuel immediately.
   • Avoid sparks and any source of ignition.
   • Use signs to alert others in the work area that fuel system work is in process.

Caution: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.

Caution: Always wear safety goggles when working with fuel in order to protect the eyes from fuel splash.

Caution: Drain the fuel tank to at least 3/4 of a tank before removing the fuel sender retaining ring or fuel sender access panel in order to avoid possible fuel spillage. Failing to follow this procedure could result in personal injury.

Notice: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:

   • The fuel pipe connections
   • The hose connections
   • The areas surrounding the connections

Notice: Do Not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints.

Important: Always replace the fuel sender O-ring when reinstalling the fuel sender assembly.


    Object Number: 180378  Size: SH
  1. Relieve the fuel system fuel pressure. Refer to the Fuel Pressure Relief .
  2. Drain the fuel tank to at least 3/4 of a tank full. Refer to Fuel Tank Draining .
  3. Remove the spare tire cover, the jack, and the spare tire.
  4. Caution: Remove the rear compartment floor trim to provide technician contact with the vehicle's metal surfaces. Failure to remove the rear compartment floor trim may cause a static electricity discharge to ignite any fuel vapor resulting in personal injury and vehicle damage.

    Notice: Remove the rear compartment floor trim to avoid damage from fuel spillage.


    Object Number: 153237  Size: SH
  5. Remove the rear compartment floor trim (1). Refer to Rear Compartment Trim Panel Replacement in Body Rear End.
  6. Remove the bolts from the fuel sender access panel (2).
  7. Notice: In order to prevent damage, cover the fuel pipe fittings with a shop towel before disconnecting the fuel pipes or removal of the fuel sender retaining ring, in order to catch any fuel that may leak out. Place the towel in an approved container when procedure is completed.

  8. Disconnect the quick-connect fittings at the fuel sender assembly. Refer to Plastic Collar Quick Connect Fitting Service .

  9. Object Number: 386438  Size: SH
  10. Disconnect the electrical connector at the modular fuel sender.
  11. Disconnect the electrical connector at the fuel tank pressure sensor.
  12. Important: When removing the modular fuel sender assembly from the fuel tank, the reservoir bucket on the fuel sender assembly is full of fuel. The modular fuel sender assembly must be tipped slightly during removal in order to avoid damage to the float. Place any remaining fuel into an approved container once the modular fuel sender assembly is removed from the fuel tank.

  13. Remove the fuel sender retaining ring (2) using the J 39765 (1).

  14. Object Number: 187107  Size: SH

    Important: The modular fuel sender assembly will spring-up when the locking ring is removed.

  15. Pull the modular fuel sender straight up while pumping the fuel from the reservoir.
  16. Clean the fuel sender assembly O-ring sealing surfaces.
  17. Inspect the fuel sender assembly O-ring sealing surfaces.

Installation Procedure


    Object Number: 187107  Size: SH

    Important: Always replace the fuel sender O-ring when reinstalling the fuel sender assembly.

  1. Position the new fuel sender assembly O-ring on the fuel tank.
  2. Important: Care should be taken not to fold over or twist the fuel pump strainer when installing the fuel sender assembly, as this will restrict fuel flow.

  3. Also, assure that the fuel pump strainer does not block full travel of float arm.

  4. Object Number: 386438  Size: SH
  5. Install the fuel sender assembly (3) and the fuel sender assembly retainer cam (2) using the J 39765 (1).
  6. Install the quick-connect fittings at the fuel sender assembly. Refer to Plastic Collar Quick Connect Fitting Service .
  7. Connect the electrical connector at the fuel tank pressure sensor.
  8. Connect the electrical connector at the fuel sender assembly.
  9. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  11. Inspect for leaks.
  12. 8.1. Turn the ignition switch ON for 2 seconds.
    8.2. Turn the ignition switch OFF for 10 seconds.
    8.3. Turn the ignition switch ON.
    8.4. Check for fuel leaks.

    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.


    Object Number: 153237  Size: SH
  13. Reinstall the fuel sender access panel (2).
  14. Tighten
    Tighten the fuel sender access panel bolts to 2 N·m (18 lb in).

  15. Reinstall the rear compartment floor trim (1). Refer to Rear Compartment Trim Panel Replacement in Body Rear End.
  16. Install the spare tire, the jack, and the spare tire cover.

  17. Object Number: 153705  Size: SH
  18. Add fuel to the fuel tank.
  19. install the fuel tank filler pipe cap (1).
  20. Install the rear seat cushion. Refer to Rear Seat Cushion Replacement in Seats.

  21. Object Number: 475295  Size: SH
  22. Install the intake manifold sight shield (1) to the engine.
  23. Install the intake manifold sight shield nuts (2).
  24. Tighten
    Tighten the nuts to 3 N·m (27 lb in).