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The fuel pressure regulator maintains a constant fuel pressure at the injectors by returning excess fuel to the tank. A faulty regulator causes the engine to run rich or lean, affecting idle quality, power, and fuel economy. Replacement ensures the injectors receive fuel at the correct pressure for accurate metering.
Fuel pressure regulators use a spring-loaded diaphragm to control fuel pressure relative to manifold vacuum. Diaphragm failure or spring fatigue alters the pressure.
Fuel pressure can be tested with a fuel pressure gauge connected to the fuel rail test port.
Commonly searched OE numbers fitting Fuel Pressure Regulator from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.