Fuel Pressure Regulator: Description and Operation

Fuel Pressure Regulator:

PURPOSE
The Fuel Pressure Regulator, mounted on the fuel injector rail and affected by intake manifold pressure (manifold vacuum), maintains constant fuel pressure to the fuel injectors.

OPERATION
The Fuel Pressure Regulator reacts to intake manifold pressure (manifold vacuum). When the difference between fuel pressure and manifold pressure (manifold vacuum) exceeds 300 kPa (43 psi), the regulator valve opens and the excess fuel is fed through the fuel return line back into the fuel tank.