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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Engine Controls - 3.9L - Troubleshooting & Diagnosis) >> Fuel System Diagnosis >> Circuit/System Testing >> Testing Procedure

Testing Procedure

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn OFF the ignition.
  2. Relieve the fuel pressure. Refer to FUEL PRESSURE RELIEF ..
  3. Disconnect the chassis fuel hose from the engine compartment fuel pipe. Refer to FUEL HOSE/PIPES REPLACEMENT - CHASSIS .
  4. Install the J 37287  between the chassis fuel hose and the engine compartment fuel pipe. See Special Tools .
  5. Open the valve on the J 37287  . See Special Tools .
  6. Turn ON the ignition, with the engine OFF.
  7. Command the fuel pump relay ON with a scan tool.
  8. Bleed the air from the J 34730-1A  .
  9. Command the fuel pump relay ON and then OFF with a scan tool.
  10. Close the fuel feed pipe shut-off valve.
  11. Monitor the J 34730-1A  for 1 minute.
    • If the fuel pressure remains constant, replace the fuel sender assembly.
    • If the fuel pressure does not remain constant, locate and replace the leaking fuel injectors.
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