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GM Full-Size Trucks 1988-1998 Repair Information
See Figure 1
All Chevrolet/GMC fuel-injected vehicles that use the MFI system are equipped with an electric fuel pump. For a fuel injection system to work properly, the pump must develop pressures well above those of a mechanical fuel pump. This high pressure is maintained within the lines even when the engine is off. Extreme caution must be used to safely release the pressurized fuel before any work is begun.
CAUTION Always relieve the fuel pressure within the system before any work is begun on any fuel component. Failure to safely relieve the pressure may result in fire and/or serious injury.
See Figures 2, 3, 4 and 5
Fig. Fig. 2: A special tool is usually available to remove or install the fuel pump locking cam
Fig. Fig. 3: A brass drift and a hammer can also be used to loosen the fuel pump locking cam
Fig. Fig. 4: Once the locking cam is released, it can be removed to free the fuel pump
Fig. Fig. 5: Once the locking cam is removed, the fuel pump assembly can be lifted straight up and out of the tank
Be careful not to bend or fold over the fuel strainer when installing the fuel sender as this will restrict fuel flow.
Fuel Pump Relay