Fuel Pressure Regulator: Description and Operation

Fig. 31 Fuel Pressure Regulator:

PURPOSE
Maintains the fuel pressure at 299.1 kPa (3.05 kg/cm2, 43.4 psi) above engine vacuum.

LOCATION
Part of the fuel rail.

OPERATION
It utilizes vacuum acting upon a diaphragm to control the amount of fuel pressure allowed to the injectors.