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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 925 (Engine Controls And Fuel - 4.3L - Diagnosis & Troubleshooting) >> Fuel System Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    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.
    • Before proceeding with this test review the User Manual CH 48027-5 for Safety Information and Instructions.
  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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