For 1996 Pontiac Truck Trans Sport
3.4L SFI 6cyl check this procedure for Fuel Pump... there are two different electric fuel pumps used:
- A medium pressure twin turbine pump for vehicles equipped with
Throttle Body Injection (TBI).
- A high pressure roller vane pump for vehicles equipped with
Sequential Fuel Injection (SFI).
(see Figure 1)
Fig. 1: View of the fuel pump assembly and related components
The fuel pump is mounted to the fuel sender assembly inside the fuel
tank. The fuel is pumped to the engine at a specified flow and pressure
by the fuel pump. Excess fuel is returned to the fuel tank by the return
pipe. The fuel pump delivers a constant flow of fuel to the engine even
during low fuel conditions and aggressive vehicle maneuvers.
When working on or near the fuel tank, be sure to observe the
information molded on the bottom of the tank.
Removal & Installation
Disconnect the negative battery cable.
Properly relieve the fuel system pressure.
(see Figure 2)
Fig. 2: Exploded view of the fuel pump-to-tank mounting
Drain and remove the fuel tank.
Remove the fuel sender assembly.
Disassemble the fuel pump strainer and the fuel pump: Note the
position of the strainer in relation to the pump.
(see Figure 3)
Fig. 3: Remove the fuel tank locking ring with a non-sparking
Support the fuel pump in one hand, and grab the strainer in the
Rotate strainer in one direction and pull off pump. Discard
(see Figure 4)
Fig. 4: Exploded view of the fuel pump components
Disconnect the fuel pump electrical connector.
Loosen the two connecting clamps, if equipped.
Place the fuel sender assembly upside down on the work bench.
Pull the fuel pump downward to remove it from the mounting
bracket, then tilt the pump outward and remove it from the connecting
hose or the fuel pulse dampener.
It is recommended to replace the hose and clamps, if equipped.
Do not run the pump unless submerged in fuel
Push the fuel pump assembly into the attaching hose. Attach the
pump electrical wires and fasten the hose clamps to the attaching hose
and around the pump body, where equipped.
Place the fuel tank sender and pump assembly into the fuel tank.
Use a new O-ring seal during assembly.
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