How to Change an LP Fuel Pump on a 1984 Ford Mustang

The 1984 Mustang generally had normally carbureted engines that did not use fuel injection. This type of engine traditionally uses a mechanical pump, but the 1984 Mustang used an electric fuel pump. Some 1984 Mustangs used a low-pressure, or LP, fuel pump, although most electric fuel pumps use high pressure. The LP fuel pump in a 1984 Mustang is on the fuel tank, requiring you to remove the fuel tank in order to replace the fuel pump.

Tools Used: Pressure gauge tool no. T80L-9974-A, Socket wrench set, Jack stands, Cleaning rag

Change an LP Fuel Pump

Obtain the replacement fuel pump for a 1984 Mustang according to your specific engine. The 1984 Mustang had a four-cylinder, 2.3L engine, a six-cylinder, 3.8L engine and an eight-cylinder, 5.0L engine. An LP fuel pump is for engines that do not have fuel injection.

Disconnect the negative battery cable with a socket wrench. Depressurize the fuel system with pressure gauge tool no. T80L-9974-A. Pump as much fuel from the tank as you can through the filler neck

Raise the vehicle on jack stands. Disconnect the return line, the vent line and the fuel supply line from the fuel tank with a socket wrench. Disconnect the fuel pump's wiring manually.

Support the fuel tank and loosen the mounting straps. Remove the mounting straps and the fuel tank. Disconnect the fuel lines located at the pump flange. Clean the retaining ring and mounting flange of the fuel pump. Turn the locking ring for the fuel pump and remove the fuel pump.

Clean any oil and debris from the mounting surfaces of the fuel tank. Apply a thin layer of grease to the mounting surface and replace the old sealing ring with the new sealing ring from your fuel pump kit.

Install the new fuel pump by performing steps 2 through 4 in reverse order. Fill the fuel tank with fuel and turn the ignition on for three seconds to activate the fuel pump. Repeat this at least six times to fully pressurize the fuel system. Check for leaks and start the engine. You may discover additional leaks in the fuel system after the engine is running.

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