Fuel Pressure Regulator

Fuel Pressure Regulator:

The fuel pressure regulator is a diaphragm-operated pressure relief valve consisting of a diaphragm, a spring, and a valve. The fuel pressure regulator keeps the fuel pressure applied to the fuel injector at a pressure 180 kPa (26 psi) greater than the pressure in the intake manifold.

The pressure applied to chamber A of the fuel pressure regulator is the intake manifold pressure. The pressure applied to chamber B of the fuel pressure regulator is fuel pressure. When the fuel pressure rises more than 180 kPa (26 psi) higher than the intake manifold pressure, the fuel pushes a valve in the regulator open and excess fuel returns to the fuel tank via the fuel return pipe.