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Home >> Chevrolet >> 2004 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.3L - 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 and intake manifold vacuum on the other side. The fuel pressure regulator maintains a constant pressure differential across the fuel injectors under all operating conditions. The fuel pressure regulator compensates for engine load by increasing fuel pressure as the engine vacuum drops.

Fig 1: Cross Sectional View Of Fuel Pressure Regulator Assembly
GM69059Courtesy of GENERAL MOTORS CORP.
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