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Mort 10/14/2012
1999 Pontiac Grand Prix SE 6 Cyl 3.1L - Engine
how do I replace a fuel sending unit
1 Answer
  • CVO
    CVO 10/14/2012
    See this repair guide
    GM Century/Lumina/Grand Prix/Intrigue 1997-2000
    Electric Fuel Pump

    The fuel pump is located inside the fuel tank. It is part of a so-called 'fuel pump module' or 'fuel sender assembly' which includes the fuel pump, the fuel tank gauge sending unit, the fuel pump strainer and related components. These fuel pump module assemblies are expensive. Be sure of the diagnosis before attempting this procedure to replace a fuel pump.

    On some vehicles covered by this guide, the fuel sender assembly can be accessed through a removable panel on the trunk floor. On others, the fuel tank must be removed. The spare tire and trunk carpet have to be removed to expose the trunk floor access panel to see which is the proper procedure to use on your vehicle.

    With Trunk Access Panel

    Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion. Wear safety glasses to protect the eyes from fuel splash.

    Always replace the fuel sender O-rings when reinstalling the fuel sender assembly. Note that the module assembly is spring loaded and it will spring-up when the retaining snapring is removed.

    When removing the modular fuel sender assembly from the fuel tank, the reservoir bucket on the fuel sender assembly is full of fuel. The sender assembly must be tipped slightly during removal to avoid damage to the float. Place any remaining fuel into an approved container once the sender assembly is removed from the fuel tank.

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