Electric Fuel Pump Replace

Fuel Pump And Sender Assembly (Typical):

1. Relief the fuel system pressure. Refer to Fuel Delivery and Air Induction / Service and Repair / Fuel System Pressure Relief Procedure.
2. Disconnect battery ground cable.
3. Raise and support vehicle.
4. Remove fuel tank, then fuel sending unit and pump assembly by turning cam lock ring counterclockwise.
5. Lift assembly from fuel tank and remove fuel pump from fuel sending unit.
6. Pull fuel pump up into attaching hose while pulling outward away from bottom support. Take care not to damage rubber insulator and strainer during removal.
7. After pump assembly is clear of bottom support, pull pump assembly out of rubber connector.
8. Reverse procedure to install.

NOTE: Some 1985 truck models equipped with electric fuel pumps may experience a no run or no start condition and/or a blown fuel pump fuse. This condition may be attributed to an inoperative in tank fuel pump caused by a short in the radio frequency interference (RFI) filter. The RFI filter is located on the electrical input terminals of the fuel pump.

- To check the above mentioned complaint, disconnect the three wire connector at the fuel tank and measure the resistance between the two outside wires (black and tan) of the connector. Resistance should be 3-4 ohms. If resistance is not as specified, replace fuel pump with new unit, Part No. 6472311. To further check the system, remove the assembly from fuel tank and measure the resistance of the RFI filter and pump assembly individually. Resistance of the RFI filter should be infinity. If resistance is not as specified, replace filter with new unit, Part No. 6472779. Resistance values for the pump assembly should be as stated above.