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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Engine Control System & Fuel System - 4.6L - Troubleshooting & Diagnosis) >> Fuel System Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 Cadillac DTS. 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 fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  4. Install the J 37287  between the chassis fuel hose and the fuel rail. 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 CH-48027  . See Special Tools .
  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 one minute. See Special Tools .
    • 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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