How to Replace a Fuel Pump on a 1989 Buick LeSabre

The LeSabre was a full-size car that the Buick division of General Motors manufactured from 1959 to 2005. The 1989 LeSabre belongs to the sixth generation of this model. It had a 6-cylinder 3.8-liter engine that used fuel injection, which requires the fuel pump to deliver highly pressurized fuel. Replacing the fuel pump in the 1989 LeSabre requires you to depressurize the fuel system and remove the fuel tank.

Tools Used: Socket wrench set, Shop towel, Fuel pressure valve J-34730-1A, Bleed hose, Gasoline container, Hand pump, Jack, Tool J-24187, Jack stands

Replace a Fuel Pump

Disconnect the negative battery cable with a socket wrench to prevent the accidental discharge of fuel. Open the fuel filler cap to relieve the pressure in the fuel tank. Remove the protective cap from the fuel pressure connection on the fuel rail. Wrap a shop towel around the fuel pressure connection. Attach fuel pressure valve J-34730-1A to the fuel pressure connection.

Connect a bleed hose to the pressure valve. Place the open end of the bleed hose into a container for gasoline. Open the fuel pressure valve to relieve the pressure in the fuel system. Replace the cap for the fuel pressure connection.

Raise the vehicle with a jack and lower it onto jack stands for support. Disconnect the vent hose from the fuel tank. Pump as much fuel as possible through the vent hose into a gasoline container.

Detach the electrical connector for the fuel sender assembly and disconnect the fuel lines for the fuel tank. Support the fuel tank with a jack stand and remove the fuel tank retaining straps with a socket wrench. Disconnect the exhaust system at the rear hanger and remove the fuel tank from the vehicle.

Turn the locking ring for the fuel pump assembly counterclockwise with tool J-24187. Remove the locking ring from the fuel pump assembly and pull the fuel pump assembly from the fuel tank. Remove the fuel pump from the fuel gauge sender unit. Discard the O-ring on top of the fuel sender unit.

Disconnect the electrical connector from the fuel pump. Release the clamps on the fuel hoses and detach the fuel hoses from the fuel pump. Release the clamp from the fuel pump and pull the fuel pump from its rubber connectors.

Install the new fuel pump and the O-ring. Fill the tank with fuel. Reconnect the cable to the negative terminal on the battery with a socket wrench. Turn the ignition switch on to pressurize the fuel system and check for fuel leaks.

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