Fuel Pressure Regulator

Relieve fuel pressure from system. Connect fuel pressure gauge between fuel filter and fuel tube. Remove hose from fuel pressure regulator and plug intake manifold. Connect hand-held vacuum pump to pressure regulator. Turn engine on and gradually apply vacuum to regulator. Fuel pressure should decrease as vacuum increases. Compare fuel pressures to regulated pressure values listed in FUEL PRESSURE table in BASIC TESTING article. If pressures are not as specified, replace fuel pressure regulator.