See Figure 1
The TBI system uses an electric fuel pump mounted in the fuel tank. The fuel pump used in this system is a positive displacement, roller vane immersible pump with a permanent magnet electric motor. The fuel is drawn in through a filter sock and pushed through the electric motor to the outlet. The pump contains two check valves. One valve is used to relieve internal fuel pump pressure and regulate maximum pump output. The other check valve, located near the pump outlet, restricts fuel movement in either direction when the pump is not operational. Voltage to operate the pump is supplied through the Auto Shutdown Relay (ASD).
REMOVAL & INSTALLATION
See Figures 2 through 8
- Properly relieve the fuel system pressure and disconnect the negative battery cable.
- Remove the fuel tank from the truck.
- Remove the locking ring, then lift out the fuel pump module. Tag any lines for replacement.
- Remove the sending unit attaching screws from the mounting bracket located on the drain tube.
- Disconnect the wires from the sending unit, then remove the sending unit.
- Remove the drain tube from the mounting lug at the bottom of the reservoir.
- Remove the lower-most coil of the drain tube from the mounting lugs on top of the reservoir. Be careful to avoid unsnapping the return line check valve cover from the bottom of the reservoir.
- Release the pump mounting bracket from the reservoir. Press the bracket with both thumbs toward the center of the reservoir.
- Remove the pump mounting bracket and rubber collar from the hose. Cut the hose clamp on the supply line and discard the clamp. Remove the pump/filter assembly. Pry the filter from the pump.
- Press a new filter onto the pump.
- Using a new clamp, attach the supply hose.
- Position the pump mounting bracket and rubber collar on the supply hose between the bulge in the hose and the pump.
- Position the pump in the reservoir so that the filter aligns with the cavity in the reservoir.
- Snap the pump bracket into the reservoir.
- Position the coil tube on the reservoir so that the drain tube aligns with the mounting lugs on the reservoir.
- Snap the lower-most coil into the mounting lugs on top of the reservoir.
- Snap the drain tube into the lugs on the bottom of the reservoir.
- Connect the wires to the sending unit.
- Align the index tab on the level unit with the index hole in the mounting bracket.
- Install the level unit screws.
- Install the assembly in the tank.