Fuel Pressure Regulator

Fuel pressure regulator is a sealed unit, divided into 2 chambers (fuel and spring chambers) by a diaphragm. The fuel chamber receives fuel through fuel rail. Spring chamber is connected to intake manifold vacuum. The balance between calibrated spring pressure seating diaphragm against return pipe and vacuum pulling diaphragm away from return pipe, maintains injector fuel pressure at 40.5 psi (290 kPa) more than manifold absolute pressure. Fuel pressure regulator is located on end of fuel rail.