Fuel Pressure Regulator: Description and Operation

Fuel Pressure Regulator:

DESCRIPTION
The fuel pressure regulator, mounted on the fuel rail, is a diaphragm operated relief valve having fuel pump pressure on one side and regulator spring pressure and intake manifold vacuum on the other side. The function of the regulator is to maintain a constant pressure 350 kPa difference across the director spray plate in the injector.

OPERATION
The pressure regulator compensates for engine load by increasing fuel pressure as engine intake manifold vacuum drops.

SERVICING
The cartridge regulator is serviced as a separate component. When servicing the fuel pressure regulator, insure that the back-up O-ring, large O-ring, a filter screen, and small O-ring are properly placed on the pressure regulator.