Fuel Pressure Regulator: Description and Operation

FUEL PRESSURE REGULATOR ASSEMBLY

Fuel Pressure Regulator Assembly:

The fuel pressure regulator is a vacuum-operated diaphragm relief valve with fuel pump pressure on one side, and with regulator spring pressure and intake manifold vacuum on the other side. The fuel pressure regulator maintains a constant pressure differential across the injectors at all times. The pressure regulator compensates for engine load by increasing the fuel pressure when the engine vacuum drops.