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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - Troubleshooting & Diagnosis) >> Fuel System Diagnosis (w/FPCM) >> Circuit/System Verification

Circuit/System Verification

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IMPORTANT:
  • Repair all fuel system related DTCs before performing this diagnostic, unless instructed here from a DTC diagnostic.
  • Inspect the fuel system for damage or external leaks before proceeding.
  • Verify that adequate fuel is in the fuel tank before proceeding.
  • The fuel pump may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
  • Before proceeding with this test review the User Manual CH 48027-5 for Safety Information and Instructions.
  1. Ignition OFF, all accessories OFF, install a CH-48027  . See Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
  2. Ignition ON, engine OFF, command the fuel pump ON with a scan tool. Verify the fuel pressure is between 345-414 kPa (50-60 psi) and does not decrease more than 34 kPa (5 psi) in 1 minute.
  3. Engine ON with the engine idling at normal operating temperature, the Fuel Rail Pressure Sensor parameter should read between 296.4-310.3 kPa (43-45 psi).
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