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*FUEL PRESSURE LEAK DOWN For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Possible Causes FUEL PUMP MODULE FUEL INJECTOR(S) Diagnostic Test 1. FUEL PUMP MODULE NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or dam- WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser- 9 ) or #6631 (3/8 9 ) fuel line adapter. Install the fuel pressure gauge. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. NOTE: Fuel specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). Monitor the fuel pressure gauge for a minimum of 5 minutes. NOTE: The pressure should not fall below 241 KPa (35 psi) Does the fuel pressure drop? Yes >> Replace Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 2 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 1047 |