ENGINE CONTROL SYSTEM 3-23
FUEL VAPOR SEPARATOR
The fuel vapor separator incorporates a float system that maintains a constant fuel level inside the separator
chamber.
As the fuel level decreases, fuel flows into the vapor separator from the low pressure fuel pump.
The function of this unit is to separate vapors from fuel delivered by the low pressure fuel pump or fuel
returned from the fuel pressure regulator.
This vapor is routed through the evaporation purge system to the air intake silencer case. (See page 3-26
for the Evaporation purge system.)
HIGH PRESSURE FUEL PUMP
The high pressure fuel pump is an “integral” type in which the pump mechanism is located within the fuel
vapor separator.
To supply the optimum fuel amount, the pump is driven by the duty cycle signal from ECM.
Valve seat
Needle valve
Float
Fuel return
Fuel pressure
regulator
Suction filter
Chamber
Evaporation
Fuel outlet
Fuel inlet
Fuel
return
Fuel drain
Fuel drain screw
Vent screw
High pressure
fuel pump
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