Legacy Wagon 4WD F4-2.5L DOHC (1996)
Fuel Pressure Regulator: Description and Operation
PRESSURE REGULATOR
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The pressure regulator is divided into the fuel chamber and the spring chamber by the diaphragm as illustrated below. Fuel is fed to the fuel
chamber through the fuel inlet connected with the injector. A difference in pressure between the fuel chamber and the spring chamber
connected with the intake manifold causes the diaphragm to be pushed down, and fuel is fed back to the fuel tank through the return line.
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By returning fuel so as to balance the above pressure difference and the spring force, the fuel pressure is kept at a constant level 250.1 kPa
(2.55 kg/cm2, 36.3 psi) against the intake manifold pressure.