Cobalt L4-2.0L SC VIN P (2005)
Fuel Pressure Regulator: Description and Operation
FUEL PRESSURE REGULATOR
The fuel pressure regulator is contained in 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 manifold absolute pressure (MAP) sensor.
