2005 Cadillac CTS VFACTORY OEM SERVICE PROCEDURE

Fuel System Cleaning: Notes

CAUTION: Refer to Gasoline/Gasoline Vapors Caution in Cautions and Notices.

The following procedure covers the disassembly and the inspection of the complete fuel supply system. If the fuel system is contaminated, the fuel system can be cleaned. You can usually determine the extent of the fuel system contamination during the disassembly.

  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
  2. Remove the in-line fuel filter. Refer to Fuel Filter Replacement .
  3. Inspect the fuel system for contamination of the in-line fuel filter. Replace the filter after cleaning the fuel lines if the filter is plugged or contaminated.
  4. Remove the fuel module assemblies. Refer to Fuel Tank Module Replacement - Primary  and Fuel Tank Module Replacement - Secondary .
  5. Locate the tank in a suitable work area away from any heat, any flame, or any other source of ignition.
  6. Perform the following procedures:
    • Inspect the fuel sender strainer. Replace the primary fuel tank module if the strainer is contaminated.
    • Inspect the secondary fuel tank module for debris. Clean the secondary fuel tank module if debris is found.
      • CAUTION: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.
    • Use compressed air in order to apply air pressure to the transfer tube.
    7. IMPORTANT: When flushing the fuel tank, handle the fuel and water mixture as a hazardous material. Handle the fuel and water in accordance with all applicable local, state, and federal laws and regulations.
  7. Flush the fuel tank with running hot water for at least five minutes. Pour the water out of the fuel sender assembly opening. Rock the tank in order to ensure that the removal of the water from the tank is complete.
  8. Disconnect the fuel feed hose/pipe from the fuel rail. Refer to Fuel Rail Assembly Replacement .
  9. Use compressed air in order to apply air pressure to the fuel lines in the opposite direction from the normal fuel flow.
  10. Remove the fuel injectors and fuel rail. Refer to Fuel Injector Replacement  and Fuel Rail Assembly Replacement .
  11. Clean and inspect the fuel injectors and fuel rail.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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