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Home >> Hummer >> 2008 >> H3 Alpha >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 5.3L - Troubleshooting & Diagnosis >> Fuel System Diagnosis >> Circuit/System Description >> Circuit/System Verification

Circuit/System Verification

    IMPORTANT:
    • 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 relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
  1. Ignition ON, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF.
  2. Ignition OFF, all accessories OFF, install the CH-48027  . Refer to Fuel Pressure Gage Installation and Removal .
  3. Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 345-414 kPa (50-60 psi) and remains steady for 5 minutes.
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