ION L4-2.2L VIN F (2004)
Fuel Pressure Regulator: Description and Operation
FUEL PRESSURE REGULATOR ASSEMBLY
The fuel pressure regulator attaches to the fuel return pipe on the fuel sender assembly. The fuel pressure regulator is a diaphragm relief valve. The
diaphragm has fuel pressure on one side and regulator spring pressure on the other side. Fuel pressure is controlled by a pressure balance across the
regulator. The fuel system pressure is constant and is no longer a function of engine load or manifold vacuum. A software bias compensates the injector
on-time based on the signal from the MAP sensor.
