Fuel System: 1G-4
Fuel Delivery System Components Description
Z9J0111701002
The fuel delivery system is composed of the low pressure fuel line components (fuel tank, filter, pump etc.), fuel vapor
separator, high pressure fuel pump, high pressure fuel filter, fuel pressure regulator (located in the fuel vapor
separator), delivery pipe, fuel injectors and hoses.
Fuel is supplied through the primer bulb, low pressure fuel filter, and low pressure fuel pump to the fuel vapor
separator.
Fuel flow from the fuel vapor separator is pressurized by the high pressure fuel pump and supplied through the high
pressure fuel filter and fuel delivery pipe to the fuel injectors.
The pressure regulator maintains fuel pressure in the feed line between the high pressure fuel pump and fuel injector.
This pressure, maintained at a constant level, is higher than the pressure in the vapor separator chamber.
When fuel feed line pressure exceeds vapor separator chamber pressure by more than approx. 250 kPa (2.55 kg/cm
2
,
36.3 psi.), the valve in the fuel pressure regulator will open and return the excess fuel to the vapor separator chamber.
Pressurized fuel enters into the intake ports through the fuel injector based on the sequential signals supplied from the
ECM.
9
8 7
15
To atmosphere
10
1
2
3
11
14
4
5
12
13
6
I9J011170003-03
1. High pressure fuel pump 5. Fuel injector 9. Low pressure fuel pump 13. Intake manifold
2. High pressure fuel filter 6. Evaporation hose 10. Fuel vapor separator 14. Throttle body
3. Fuel cooler 7. Primer bulb 11. Fuel pressure regulator 15. Fuel tank
4. Fuel delivery pipe 8. Low pressure fuel filter 12. Intake silencer
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