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Home >> Pontiac >> 2005 >> Sunfire Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 2.2L - Introduction >> Description and Operation >> Fuel System Description >> Fuel Pressure Regulator Assembly
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Fuel Pressure Regulator 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. A software bias compensates the injector on-time based on the signal from the MAP sensor.

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