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Disconnect the negative terminal on the battery with a socket wrench to avoid starting the engine accidentally. Open the fuel filler cap to relieve the vapor pressure in the fuel tank. Remove the cap for the fuel pressure fitting on the fuel rail, and wrap a shop towel around the fuel pressure fitting. Attach fuel pressure valve J 34730-1A to the fuel pressure fitting, and place the bleed hose into container approved for gasoline. Open the valve to release the pressure in the fuel system, and fasten the fuel filler cap.

Raise the vehicle with a jack and support it on jack stands. Disconnect the filler vent hose from the fuel tank and connect the open end of the hose to a hand-operated pump. Drain as much fuel from the fuel tank is possible into a gasoline container.

Detach the electrical connector for the fuel sender and remove the fuel lines from the fuel sender. Disconnect the quick connectors for the fuel pipe and support the fuel tank with jack stands. Remove the bolts for the fuel tank retaining straps with a socket wrench and disconnect the rear hangar of the exhaust system. Disconnect the fuel tank and remove it from the vehicle.

Turn the locking ring for the fuel sender assembly counterclockwise with tool J-24187. Lift the fuel sender assembly carefully from the fuel tank, detach the fuel pump from the fuel gauge sender unit. Discard the O-ring on top of the fuel sender. Disconnect the electrical connector for the fuel comp, and release the clamps around the fuel pump. Pull the fuel from its rubber connectors.

Install the new fuel pump by performing Steps 2 through 4 in reverse, ensuring that you also install a new O-ring. Fill the fuel tank, and connect the negative terminal on the battery with a socket wrench. Turn the ignition on to pressurize the fuel system, and check for fuel leaks.

Loosen and remove the two fuel lines from the mechanical fuel pump, using a 9/16-inch wrench. Use a screwdriver to remove the hose clamps if the fuel line is clamped on. The fuel line from the tank must be temporarily plugged to prevent leaks.

Slide a small piece of fuel line over the line coming from the fuel tank and insert a 3/-8-inch bolt into the open end of the fuel line to prevent any leaking.

Loosen and remove the two bolts that hold the fuel pump to the engine block and remove the pump.

Scrape the old gasket from the mounting plate and use gasket cement to glue on a new one. Let the gasket cement set before attempting to replace the pump.

Slide the chrome push rod back up toward the camshaft on Chevy engines. (For non-Chevy engines, go to Step 6.) The rod is located inside the hole where the fuel pump bolts on. Insert the pump lever of the new fuel pump into the mounting hole before the push rod slides back down and blocks this task. Thread both mounting bolts into the threaded mounting holes before tightening them.

Insert the pump arm into the fuel pump mounting hole on non-Chevy engines. Line up and thread both mounting bolts into the threaded mount holes, before tightening them.

Reattach both fuel lines. The fuel lines should align with their respective line fittings. Be sure to tighten the lines to avoid any leaks.