Fuel Pump Module

The fuel module replaces the VST system. This style of module isused in both late TBI and all MPI engines. The modules used between the TBI and MPI systems are NOT interchangeable. (see chart next page)

It contains the low pressure pump, high pressure pump and the fuel cooler-vapor separator cylinder all mounted in one compact unit.

The fuel cooling cylinder is made of anodized extruded aluminum and is sealed with double “O”rings at each end.

The cylinder is mounted in a vertical position to keep the fuel level as high as possible and separate vapors through an improved needle and float valve.

The low pressure pump fills the reservoir. The high pressure pump takes suction from the reservoir. The reservoir is raw water cooled. Raw water enters the unit at the bottom through the small hose and exits at the top of the module and isdischarged to the inboard side of the exhaust riser.

The second small rubber hose at the very top of the reservoir isthe vapor line to the intake manifold.

Fuel Pump Module 05 8.1L Regulator

LP Pump

HP Pump

Starting with the 8.1Gi-F, 8.1OSi-B and the 8.1GXi-E, all 8.1L engines get the new fuel pump module. The fuel pressure regulator has been moved from thefuel rail to the discharge side of the high pressure pump at the module. This requires new part numbers for all the fuel system components except the high pressure pump.

The current fuel pressure leakdown tests in Workshop Manual 7742218 do NOT cover this fuel pump module.

Fuel pressure specifications for this fuel pump module stay the same as the previous 8.1L’s.