GM 6472037 Fuel Pump Assembly

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The process for replacing a mechanical pump on carbureted models involves disconnecting the battery cable, detaching the fuel inlet hose, outlet line, and vapor return hose, removing the mounting bolts, and retrieving the pushrod. After cleaning the block mounting surface and applying grease to the pushrod, the new gasket and pump are installed and the hoses and lines are reattached. For electric pumps on fuel-injected models, the fuel system pressure is relieved and the fuel tank is removed. The fuel pump/sending unit assembly is unlocked by turning the inner ring counterclockwise, and then lifted from the tank. The rubber gasket and strainer are inspected and replaced if necessary. If needed, the fuel pump can be separated from the sending unit. The assembly is then inserted back into the fuel tank and the inner lock ring is turned clockwise to engage the locking cams. Finally, the fuel tank is installed.

To test the fuel pump, start by disconnecting the fuel line into the carburetor and then crank the engine.

The first step is to disconnect the battery cable.

For fuel-injected models, start by verifying that the fuel pump is running by listening for a whirring noise when the ignition switch is turned on. If the pump does not come on, check the fuel pump fuse and relay. If they are both functioning properly, check for an open circuit between the relay and the fuel pump. If the circuit is fine, disconnect the electrical connector at the fuel pump and connect battery voltage to the gray wire terminal of the pump to see if the pump runs.

After cleaning the block mounting surface and applying grease to the pushrod, the new gasket and pump should be installed and the hoses and lines should be reattached.

The initial steps involve checking the fuel tank to ensure it has enough fuel. While the engine is running, inspect all fuel lines for leaks, loose connections, or any damage. Additionally, check for air leaks before the fuel pump, as this can affect its performance.