Fuel Pressure Test
NOTE:
After each repair procedure has been completed, reconnect all components. Perform TEST VER-1: POWERTRAIN VERIFICATION
under VERIFICATION TESTS to ensure system is functioning properly.
- Disconnect negative battery cable. Release fuel pressure. See FUEL PRESSURE RELEASE . Install fuel pressure gauge with hose on fuel pressure test port.
- Start engine, allow to idle and reach operating temperature. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm2 ). If no fuel pressure exists and engine will not start, fuel pump relay and control circuit may be defective. See FUEL PUMP CONTROL CIRCUIT .
- If engine runs but fuel pressure is less than specified, check for kinked or damaged fuel line between fuel pump module and fuel rail. Repair fuel line as necessary and retest. If fuel line is okay, perform FUEL PUMP AMPERAGE TEST , FUEL PUMP VOLUME TEST and FUEL PRESSURE LEAKDOWN TEST . If specifications were not met for FUEL PUMP AMPERAGE TEST, FUEL PUMP VOLUME TEST or FUEL PRESSURE LEAKDOWN TEST, replace fuel pump module. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If fuel pressure exceeds specification, fuel pump is okay, but fuel pressure regulator is defective. Replace fuel pressure regulator. Fuel pressure regulator is incorporated with the fuel filter. Fuel filter/fuel pressure regulator is located on top of fuel tank, in fuel pump module. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.