Installation manual

4-19
90-898305
3.0L OptiMax Fuel Schematic (Cont.)
1. Engine Pulse Fuel Pump
2. Fuel/Water Separator Filter
3. Vapor Separator Tank Vent Hose
4. Fuel Outlet from High Pressure Electric Fuel Pump – 620 kPa (90 psi)
5. Bleed Off from Air Pressure Regulator; routed to exhaust adaptor and exits
through the propeller
6. Air Compressor Inlet Coolant Hose
7. Air Compressor
8. Air Compressor Inlet Air Filter
9. High Pressure Air Outlet – 551 kPa (80 psi)
10. Schrader Valve for testing fuel pressure – 620 kPa (90 psi)
11. Fuel Injector is opened by the ECM/PCM, 620 kPa (90 psi) fuel is
discharged into a machined cavity inside the air chamber of the air/fuel rail.
This mixes fuel with the air charge.
12. Tracker Valve has a rubber diaphragm which expands and retracts to
equalize the pulses developed by the pumps [both air and fuel].
13. Cooling water routed from air compressor to tell-tale
14. Direct Injector discharges the air/fuel mixture into the combustion chamber
15. Schrader Valve for testing air pressure – 551 kPa (80 psi)
16. Water Inlet to cool port air/fuel rail and air compressor
17. Fuel Pressure Regulator not only regulates fuel pressure but also
regulates it at approximately 69 kPa (10 psi) higher than whatever the air rail
pressure is. The fuel regulator diaphragm is held closed with a spring that
requires 69 kPa (10 psi) to force the diaphragm off the diaphragm seat. The
backside 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.
18. Air Pressure Regulator will limit the amount of pressure developed inside
the air passages to approximately 69 kPa (10 psi) below the pressure of the
fuel inside the fuel passages
19 Bleed off from fuel pressure regulator; routed back to vapor separator tank.
20. Low Pressure Electric Fuel Pump Schrader Valve
21. Fuel Director
22. Vapor Separator Tank Drain Screw
23. Vapor Separator Tank Drain Fitting
24. 172 kPa (25 psi) relief valve
25. Low Pressure Electric Fuel Pump
26. Vapor Separator Tank Float Needle
27. Vapor Separator Tank Float
28. Fuel/Water Drain Fitting
29. Fuel/Water Drain Screw
30. Fuel/Water Sensor
31. Fuel Inlet from primer bulb