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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 679 (Engine Controls And Fuel - 2.2L (L61) - Introduction (2 Of 2)) >> Description and Operation >> Fuel System Description (RPO NT7) >> Fuel Pressure Regulator Assembly

Fuel Pressure Regulator Assembly

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The fuel pressure regulator attaches to the fuel return pipe on the fuel pump module. 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.

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