Mopar R4682087 Fuel Pump

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To remove the fuel tank, use a hammer and a BRASS punch to remove the fuel pump lock ring in a counterclockwise direction. Lift the fuel pump and O-ring out of the tank. Clean the sealing area and install a new O-ring. Inspect the fuel inlet sock filter for damage, replacing it if necessary. Place the fuel pump in position, install the locking ring, and use a hammer and a BRASS punch to secure it. Finally, install the fuel tank.

Remove the fuel tank cap and listen for the sound of the in-tank pump when the ignition key is turned to On. If the pump is not heard, check the fuses and then proceed to the following steps. Raise the rear of the vehicle and locate the wire harness to the fuel pump. Unplug the fuel pump electrical connector and use a test light to check for voltage to the pump in the On and Start positions of the key. If there is voltage, replace the pump or trace the wires for any open or short circuit. If the pump still doesn't work, have the vehicle checked by a professional. Relieve the fuel pressure and connect a fuel pressure gauge to the fuel inlet hose. Start the engine and record the fuel pressure. If the pressure is below specifications, check for a plugged or restricted fuel filter or line. If the pressure is still low, pinch the return line and if the pressure increases, replace the fuel pressure regulator. If there is no change in pressure, check for a plugged fuel pump sock filter or a defective fuel pump. If the fuel pressure is above specifications, disconnect the primary wires from the ignition coil and remove the return hose. Connect a short section of hose and direct it into a fuel container. Have an assistant crank the engine and check for a plugged return line. If the pressure is now correct, the problem is a restricted return line. Finally, detach the vacuum hose from the fuel pressure regulator and observe the gauge for an increase in pressure. If there is no increase, replace the fuel pressure regulator.