Fuel Pressure Regulator

The pressure regulator is integral to the fuel charging main body and is located near the rear of the air horn. It is located so as to nullify the effects of supply line pressure drops. It is designed so that it is not sensitive to back-pressure in the return line to the tank.

One function of the pressure regulator is to maintain fuel supply pressure upon engine and fuel pump shutdown. The regulator functions as a downstream check valve and traps the fuel between itself and the fuel pump.

The maintenance of fuel pressure upon engine shutdown precludes fuel line vapor formation and allows for rapid restarts and for stable idle operation. The nominal regulated pressure is 14.5 psi (1.0 kg/cm² ). However, this value may vary from unit to unit. Pressure is adjusted at the factory to compensate for differences in fuel flow among injectors.