1G-6 Fuel System:
Fuel Pressure Regulator
The fuel pressure regulator is located in the fuel vapor separator.
The regulator's function in the system is to maintain constant fuel pressure to the injectors while the engine is
operating.
The regulator diaphragm chamber is open to the fuel vapor separator chamber to keep the pressure balanced.
Fuel pressure, adjusted by the regulator, is constantly maintained higher than the pressure in the fuel vapor separator
chamber by approx. 295 kPa (2.95 kg/cm
2
, 42 psi.).
By-pass fuel is returned to the fuel vapor separator chamber.
Fuel Injector
The fuel injector is an electromagnetic valve operated by a signal from the ECM.
When the injection signal is supplied to the fuel injector, the solenoid coil is energized pulling up the plunger.
This opens the injector valve and injects fuel.
Because the fuel pressure is kept constant, the amount of fuel injected is determined by the amount of time (duration)
the electromagnetic valve is open.
DENEPO EVLAVDESOLC EVLAV
(over 295 kPa)
(below 295 kPa)
1
2
3
1
2
3
“B”
“A”
“C”
1. Fuel pressure regulator 3. Float chamber “B”: From high pressure fuel pump
2. Air passage “A”: By-pass fuel “C”: To float chamber
1. Filter 3. Ball valve
2. Solenoid coil 4. Terminal
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