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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Control System & Fuel System - 3.8L - Troubleshooting & Diagnosis) >> Fuel System Diagnosis >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. 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 (Without CH 48027) or Fuel Pressure Relief (With CH 48027) .
  3. Disconnect the chassis fuel hose from the engine compartment fuel pipe. Refer to Metal Collar Quick Connect Fitting Service .
  4. Install the J 37287  between the chassis fuel hose and the engine compartment fuel pipe.
  5. Open the valve on the J 37287  .
  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 CH-48027  .
  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 CH-48027  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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