Fuel Pump: Service and Repair

High Pressure Pump:

HIGH PRESSURE PUMP
REPLACEMENT

The high pressure pump is frame mounted and can be accessed from under the vehicle. Before removing the fuel pump, relieve the pressure in the fuel system using a fuel pressure gauge, or by opening the electrical circuit to the fuel pump and cranking the vehicle for a minimum of 20 seconds.

Low Pressure Pump:

LOW PRESSURE PUMP
REPLACEMENT

The low pressure pump is located in the fuel tank and may require removal of the fuel tank for replacement. Refer to FUEL TANKS.
1. Remove the fuel from the fuel tank until fuel level is below fuel sender mounting hole.
2. Disconnect the wiring connector from the fuel system sender.
3. Remove any dirt that has accumulated around the sender so that it will not enter the tank or lines.
4. Loosen the quick connect fittings and disconnect the fuel tank line at the sender.
5. Turn the fuel sender locking ring counterclockwise with fuel tank sender wrench. Remove the locking ring, sender and sealing gasket.
6. Clean the fuel sender mounting surface on the fuel tank.
7. Place a new sealing gasket in the groove of the fuel tank. Install the fuel sender into the fuel tank so that the tabs of the sender are positioned into slots of the fuel tank. The sealing gasket must remain in place during and after fuel sender installation.
8. Holding the fuel sender and sealing gasket in place, install and rotate the locking ring clockwise until the stop is against the retainer ring tab.
9. Connect the fuel sender wire and the fuel tank line.
10. Refill the tank with the fuel removed. Check for proper fuel gauge operation and for leaks while refilling.