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Home >> Cadillac >> 2006 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.4L - Troubleshooting & Diagnosis >> Fuel System Diagnosis >> Circuit/System Verification
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Circuit/System Verification

  1. Turn OFF the ignition.
  2. Relieve the fuel pressure. Refer to Fuel Pressure Relief .
  3. Disconnect the chassis fuel hose from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  4. Install the J 37287  between the chassis fuel hose and the fuel rail.
  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 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 one 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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