Installation manual

4-23
90-898305
Vapor Separator Fuel Flow
1) High Pressure Fuel (to Air/Fuel
Rail)
2) Return Fuel (from Air/Fuel Rail)
[on 3.0L models this hose
connection point (on VST) is
reversed with low pressure fuel
pump hose connection point.]
3) Vent Tube (to Flywheel Cover)
4) Fuel Inlet (from Pulse Driven
Fuel Pump)
5) Low Pressure Fuel Pump
6) Water Separating Fuel Filter
7) Float
8) Fuel Return Orifice
9) Drain Plug
10) Filter
11) High Pressure Fuel Pump
12) Vapor Separator
The low pressure electric fuel
pump was added, to eliminate
vapor locking of the fuel system.
This pump draws fuel from the
main chamber of the vapor
separator, and pushes the fuel into
the chamber (in the vapor
separator) where the high pressure
electric fuel pump is located. This
creates a pressure of about 6 to 7
psi on the input side of the high
pressure fuel pump. The extra fuel
in this chamber returns to the main
vapor separator chamber through a
0.030 hole. By maintaining this low
pressure on the input side of the
high pressure fuel pump any
potential vapor lock is eliminated.
Notes
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