1G-4 Fuel System:
Fuel Delivery System Components Description
ZAJ6111701002
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, 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 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. 295 kPa (2.95 kg/cm
2
,
42 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.
“A”
2 9
10
14
6 7
8
12
13
11
15
3
4
5
1
1. High pressure fuel pump 5. Evaporation hose 9. Fuel vapor separator 13. Throttle body
2. Fuel cooler 6. Primer bulb 10. Fuel pressure regulator 14. Fuel tank
3. Fuel delivery pipe 7. Low pressure fuel filter 11. Intake silencer 15. IAC valve
4. Fuel injector 8. Low pressure fuel pump 12. Intake manifold “A”: To atmosphere
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