1. Fuel inlet from primer bulb
2. Engine Pulse Fuel Pump
3. Fuel line to Water Separating Fuel Filter – 2-8 psi (14-55 kPa)
4. Water Separating Fuel Filter in Vapor Separator Tank (VST) Assembly
5. Fuel outlet from VST
6. Fuel Inlet to Low Pressure Electric Fuel Pump
7. Fuel outlet from Low Pressure Electric Fuel Pump – 7-9 psi (48-62 kPa)
8. Fuel inlet to High Pressure Electric Fuel Pump.
9. Relief Passage – Unused fuel returning to VST
10. Air Vent to VST
11. Fuel outlet from High Pressure Electric Fuel Pump – 90 psi (620 kPa)
12. High pressure fuel Inlet to Air/Fuel Rails – 90 psi (620 kPa)
13. Fuel Injector is opened by the ECM, 90 psi (620 kPa) fuel is discharged into a machined cavity inside
the air chamber of the air/fuel rail. This mixes the fuel with the air charge.
14. Air Inlet to Air Compressor
15. Air Compressor
16. High Pressure Air Outlet – 80 psi (551 kPa)
17. High Pressure Air Inlet to Air/Fuel Rails – 80 psi (551 kPa)
18. Direct Injector discharges the air/fuel mixture into the combustion chamber
19. Schrader Valve for Testing Air Pressure
20. Schrader Valve for Testing Fuel Pressure
21. Air Pressure Regulator will limit the amount of pressure developed inside the air passages to approxi-
mately 10 psi (69 kPa) below the pressure of the fuel inside the fuel passages (i.e. 80 psi [551 kPa] air
vs 90 psi [620 kPa] fuel)
22. Bleed Off from Air Pressure Regulator, Routed to the Exhaust Adaptor and Exits thru the Propeller
23. Fuel Pressure Regulator not only regulates fuel pressure but also regulates it at approximately 10 p.s.i.
(69 kPa) higher than whatever the air rail pressure is. The fuel regulator diaphragm is held closed with
a spring that requires 10 p.s.i. (69 kPa) to force the diaphragm off the diaphragm seat. The back side
of the diaphragm is exposed to air rail pressure. As the air rail pressure increases, the fuel pressure
needed to open the regulator will equally increase.
24. Bleed off from Fuel Pressure Regulator, Routed Back to VST
25. Tracker Valve has a rubber diaphragm which expands and retracts to equalize the pulses developed
by the pumps (both air and fuel).
26. Check Valve – 40 psi (276 kPa)
27. Fuel return inlet from Fuel Regulator
28. Water Inlet to cool port air/fuel rail and air compressor
29. Cooling water from Compressor routed to Tell-Tale
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