ParkAvenue 1997-1999

Fuel Pump

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Removal & Installation



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

The fuel pump is located in the fuel tank. The fuel tank must be removed from the vehicle in order to access the pump.

  1. Properly relieve fuel system pressure.
  2.  
  3. If not already done, disconnect the negative battery cable.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Safely drain and remove the fuel tank assembly, as outlined later in this section.
  8.  
  9. If necessary, detach the quick-connect fittings from the fuel sender assembly and remove the fuel lines.
  10.  
  11. Remove the fuel gauge sender and pump assembly by turning the cam locking ring counterclockwise. It may be necessary to use a spanner wrench, such as tool J-24187, to perform this.
  12.  
  13. Carefully lift the assembly from the fuel tank, then remove the fuel pump from the fuel gauge sender unit.
  14.  
  15. Remove the sender O-ring from the top of the sender and discard.
  16.  
  17. Disconnect the pump wires, hose clamps and the clamp from around the pump body.
  18.  
  19. Pull the pump assembly out of the rubber connectors.
  20.  
  21. Inspect the fuel pump attaching hose for any signs of deterioration, and replace as necessary.
  22.  



Click image to see an enlarged view

Fig. Exploded view of the fuel pump and related components - 1987-91 vehicles



Click image to see an enlarged view

Fig. Exploded view of the fuel sender and pump - 1993 vehicle shown, later years similar

To install:

  1. Push the fuel pump assembly into the attaching hose. Attach the pump electrical wires and fasten the hose clamps to the attaching hose and around the pump body.
  2.  
  3. Place the fuel tank sender and pump assembly into the fuel tank. Use a new O-ring seal during assembly.
  4.  
  5. Place the cam lock over the assembly, then lock by turning clockwise, using a suitable spanner wrench, if necessary.
  6.  
  7. If removed, attach the fuel sender fuel line quick-connect fittings.
  8.  

When installing the fuel tank, make sure all rubber sound isolators or anti-squeak spacers are replaced in their original locations.

  1. Install the fuel tank, as outlined later in this section.
  2.  
  3. Refill the fuel tank.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Turn the ignition switch to the ON position to pressurize the fuel system and check for leaks.
  8.  

Specific to:

Buick Park Avenue 1998-1999

Oldsmobile Regency 1998

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the fuel tank.
  6.  
  7. Remove or disconnect the following:
    NOTE
    Note the direction the strainer is pointing and remove the strainer from the pump by pulling it down and twisting.



    Negative battery cable
     
    Fuel tank filler pipe
     
    Evaporative Emissions (EVAP) pipe
     
    Quick connect fuel lines from the fuel tank
     
    Rear rubber exhaust hangers
     
    Fuel tank strap bolts, support the fuel tank
     
    Fuel tank.
     
    Lockring and the fuel sender assembly from the tank
     



    Pump electrical wires connectors and hoses
     
    Pump assembly, pull it out of the rubber connectors
     

  8.  

To install:

  1. Connect the pump to the fuel hose and tilt the bottom of the pump into the mounting bracket.
  2.  
  3. Install or connect the following:

    New strainer on the pump so it points in the same direction as noted during removal
     
    Electrical connectors and fuel lines to the pump
     
    New O-ring on top of the fuel tank
     
    Fuel sender assembly into the tank
     
    Lockring
     
    Fuel tank
     
    Fuel sender electrical connector
     
    Fuel tank straps. Torque the bolts to 25 ft. lbs. (34 Nm) on all models except Park Avenue and 35 ft. lbs. (48 Nm) on Park Avenue models.
     

  4.  
  5. Remove the support.

    Rubber exhaust hangers to rear exhaust
     
    Quick connect fuel lines onto the fuel tank
     
    Fuel tank EVAP pipe to the tank. Torque the hose clamp to 25 inch lbs. (2.8 Nm).
     
    Fuel tank filler pipe to the tank. Torque the hose clamp to 25 inch lbs. (2.8 Nm).
     
    Negative battery cable
     

  6.  
  7. Refill the fuel tank.
  8.  
  9. Run the engine and check for leaks and proper engine operation.

    Click image to see an enlarged view

    Fig. Fuel pump and level sender assembly

  10.  

Specific to:

Buick Park Avenue 1998-1999

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the fuel tank.

    Click image to see an enlarged view

    Fig. The fuel pump service cover is located in the luggage compartment under the spare tire-Park Avenue shown others similar

  6.  
  7. Remove or disconnect the following:
    CAUTION
    When removing the fuel sender from the tank, the reservoir bucket is full of fuel. Use caution in containing the fuel.


    NOTE
    Note the direction the strainer is pointing.



    Negative battery cable
     
    Spare tire and jack
     
    Trunk lining
     
    Fuel sender access panel
     
    Sender and quick connect fittings from the sender
     
    Electrical connector from the sender and position harness and hoses aside
     



    Sender retaining ring
     
    Sender and take note of its position
     
    Fuel sender O-ring and discard it
     



    Strainer from the pump by pulling it down and twisting
     
    Pump electrical wires and hoses
     
    Pump assembly out of the rubber connectors
     

  8.  

To install:

  1. Transfer any insulators and grommets from the old pump to the new one.
  2.  
  3. Connect the pump to the fuel hose and tilt the bottom of the pump into the mounting bracket.
  4.  
  5. Install or connect the following:

    New strainer on the pump so it points in the same direction as noted during removal
     
    Electrical connectors and fuel lines to the pump
     
    New O-ring on top of the fuel tank
     
    Fuel sender assembly into the tank
     
    Lockring
     
    Fuel line quick connectors
     
    Sender electrical connector
     
    Fuel sender access cover
     
    Trunk liner
     
    Spare tire and jack
     

  6.  
  7. Refill with fuel and check for leaks.
  8.  

Testing



Specific to:

Buick LeSabre 1986-1999

Buick Park Avenue 1996-1999

Oldsmobile 88 1992-1999

Oldsmobile Delta 88 1986-1988

Oldsmobile LSS 1996-1999

Pontiac Bonneville 1987-1999

  1. Unscrew the cap from the fuel rail pressure valve on the fuel rail. You may have to remove the fuel injector sight shield for access to the valve.
  2.  



Click image to see an enlarged view

Fig. Remove the cap (1) from the fuel rail pressure valve (2) on the fuel rail

  1. Connect pressure gauge J-34730-1 or equivalent to the fuel pressure test point on the fuel rail. Wrap a rag around the pressure tap to absorb any leakage that may occur when installing the gauge.
  2.  



Click image to see an enlarged view

Fig. Test the fuel system pressure using a suitable gauge attached to the test connection

  1. Turn the ignition ON ; the fuel pump should run for a few seconds. Check the pump pressure for the following specifications:
    1. 1987-93 vehicles, except 1993 VIN K: 41-47 psi (284-323 kPa).
    2.  
    3. 1993 VIN K and 1996-99 vehicles: 48-33 psi (333-376 kPa).
    4.  

  2.  
  3. Start the engine and allow it to idle. The fuel pressure should drop about 3-10 psi (21-69 kPa) due to the lower manifold pressure.
  4.  

The idle pressure will vary somewhat depending on barometric pressure. Check for a drop in pressure indicating regulator control, rather than specific values.

  1. If the fuel pressure drops more than a few pounds when you shut the engine OFF , check the operation of the check valve, the pump coupling connection, fuel pressure regulator valve and the injectors.
  2.  
  3. Before attempting to remove or service any fuel system component, it is necessary to relieve the fuel system pressure.
  4.  

 
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