MEFI Fuel Injection
Fuel Pump Module
The fuel module replaces the VST system. This style of module is used 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 is discharged to the inboard side of the exhaust riser. The second small rubber hose at the very top of the reservoir is the vapor line to the intake manifold.
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