Impulse Hatchback L4-1809cc 1.8L DOHC (4XF1-W) (1992)
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Fuel Pressure Regulator: Description and Operation
Fuel Rail
PURPOSE
It keeps the fuel pressure applied to the injectors between 2.45 - 2.86 kg/cm2 (245 - 286 kPa, 35 - 42 psi) at all times.
LOCATION
On the fuel injector rail.
OPERATION AND CONSTRUCTION
The fuel pressure regulator is diaphragm-operated relief valve consisting of diaphragm, spring and valve.
The pressure applied to the chamber "A" of fuel pressure regulator is intake manifold pressure and that to the chamber "B" is fuel pressure. When
the fuel pressure rises more than a predetermined level higher than the intake manifold pressure, the fuel pushes the valve in the regulator open and
excess fuel returns to the fuel tank via the return line.
