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Home >> BMW >> 1998 >> M3 4D Sedan, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System >> Fuel Delivery >> Fuel Pressure Check (Lack Of Power)
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Fuel Pressure Check (Lack Of Power)

Run engine at idle and check fuel pressure. See FUEL PRESSURE REGULATOR . Disconnect vacuum hose from fuel pressure regulator, simulating wide open throttle. If fuel pressure does not increase 5.8-10.1 psi (.40-.71 kg/cm2 ), replace vacuum hose and repeat test. If fuel pressure still does not increase, replace fuel pressure regulator.