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How to Change the Fuel Pump on a 1988 Ford F150

The Ford F series is a line of full-size pickup trucks in continuous production since 1948, with the F-150 models being the most popular. The 1988 Ford F-150 has an early form of fuel injection that uses a low-pressure electric fuel pump. The replacement of the fuel pump itself is a relatively simple task, but accessing the fuel pump requires you to remove the fuel tank. The great majority of the work in replacing the fuel pump on a 1988 Ford F-150 is the removal and installation of the fuel tank.

Tools Used: Socket wrench set, Pressure gauge T80L-9974-A, Hammer and wood dowel, Torque wrench

Change the Fuel Pump

Park the vehicle and turn off the ignition. Open and secure the hood. Disconnect the negative battery cable with a socket wrench and remove the fuel tank filler cap.

Remove the valve cap to the fuel pressure relief valve on the fuel line and connect the T80L-9974-A pressure gauge to the relief valve. Place the end of the hose for the pressure gauge into a gasoline-approved container. Open the pressure gauge valve. Drain the fuel from the fuel system into the container. Remove the pressure gauge and replace the valve cap on the relief valve.

Drain the fuel from the tank. Disconnect the wiring from the fuel-sending unit and the fuel line from the fuel tank. Remove the air relief tube from the fuel tank. Loosen the clamp on the filler neck hose and detach the filler neck from the fuel tank. Disconnect the mounting bolts for the fuel tank's retaining strap. Remove the fuel tank from the vehicle.

Detach the electrical wiring from the fuel-sending unit. Clean the fuel tank around the fuel sending unit and disconnect the fuel lines from the fuel sending unit. Turn the locking ring of the fuel sending unit counterclockwise with a hammer and wood dowel. Remove the locking ring and disconnect the fuel sending unit from the fuel tank. Discard the gasket on the fuel tank.

Put the new gasket into the groove on the tank. Install the new fuel-sending unit to the fuel tank while keeping the gasket in place. Align the tabs on the locking ring with the slots on the fuel tank and turn the locking ring clockwise until it is against the retainer ring tab.

Connect the fuel lines and electrical wiring to the fuel sending unit. Connect the fuel tank and tighten the nuts on the fuel tank's restraining strap to 30 foot-pounds with a torque wrench.

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