All fuel injected trucks are equipped with an electric fuel pump. The fuel pump on the 1984 Pick-Up is attached to the front side of the fuel tank. The pump on 1985-88 models is located inside the fuel tank.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Unplug the fuel pump wiring connector.
- Unscrew the four bolts and remove the service hole cover.
- Disconnect and plug the fuel pump inlet hose.
- Remove the bolt at the fuel pump bracket.
- Raise the rear of the truck and support it with jack stands.
- Remove the fuel pipe bracket. Slowly loosen and then disconnect the fuel pump outlet hose.
- Unscrew the two remaining fuel pump bracket bolts and then remove the pump.
- Install the fuel pump and connect the outlet hose.
- Install the fuel pipe bracket.
- Connect the fuel pump inlet line, wiring connector and the battery cable.
- Start the engine and check for any leaks.
See Figure 1
- Drain the fuel from the tank and then remove the fuel tank.
- Remove the seven bolts and then pull the fuel pump bracket up and out of the fuel tank.
- Remove the two nuts and then tag and disconnect the wires at the fuel pump.
- Pull the fuel pump out of the lower side of the bracket. Disconnect the pump from the fuel hose.
- Remove the rubber cushion and the clip. Disconnect the fuel pump filter from the pump.
- Install the fuel pump filter to the pump.
- Insert the outlet port of the fuel pump into the fuel hose.
- Install the rubber cushion to the lower side of the fuel pump.
- Push the lower side of the fuel pump (and the rubber cushion) into the pump bracket.
- Using a new gasket, position the bracket on the fuel tank and then install and tighten the seven mounting bolts to 30 inch lbs. (3.4 Nm).
- Install the fuel tank.
- Start the truck and check for any loose connections or leaks.
See Figures 2 and 3
- Turn the ignition switch to the "ON'' position, but don't start the engine.
- Remove the rubber cap from the fuel pump check connector and short terminals FP and +B .
- Check that there is pressure in the hose to the cold start injector.
At this time you should be able to hear the fuel return noise from the pressure regulator.
- If no pressure can be felt in the line, check the fuses and all other related electrical connections. If everything is all right, the fuel pump will probably require replacement.
- Remove the service wire, reinstall the rubber cap and turn off the ignition switch.