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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 160 (ENGINE CONTROLS - REMOVAL & INSTALLATION)FUEL SYSTEMS (GASOLINE)FUEL TANKFUEL SYSTEM CLEANING
1999 GMC Forward Control 5.7 R, Automatic

Fuel System Cleaning

1999 GMC Forward Control 5.7 R, AutomaticSECTION Fuel System Cleaning
WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the fuel filter is plugged, the fuel tank should be inspected internally and cleaned if necessary.
    NOTE: Cap the fittings and plug the holes when servicing the fuel system to prevent dirt and other contaminants from entering the open pipes and passages. Whenever the fuel tank is cleaned, the fuel pump fuel strainer must be inspected. If the fuel pump fuel strainer is contaminated, the fuel pump fuel strainer must be replaced and the fuel pump must be inspected.
  1. Remove the fuel tank, if not already removed. See FUEL TANK .
  2. Remove the fuel sender assembly from fuel tank, if not already removed. See FUEL LEVEL SENSOR .
  3. Check the fuel sender strainer. Replace the fuel sender assembly if the fuel strainer is contaminated.
  4. Check the fuel pump inlet for dirt and debris. If dirt and debris are found, the fuel pump needs to be replaced.
    5. CAUTION: 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.
  5. Flush the fuel tank using hot water.
  6. Pour the water out of the fuel sender assembly opening in the fuel tank. Rock the fuel tank to be sure that the removal of the water from the fuel tank is complete.
  7. Allow tank to dry completely before reassembly.
  8. Disconnect the fuel pipes at the engine compartment. See FUEL LINE QUICK CONNECT FITTINGS .
    9. NOTE: Only use oil free compressed air to blow out the fuel pipes.
  9. Clean the fuel pipes by applying air pressure in the opposite direction of the fuel flow.
  10. Connect the fuel pipes at the engine compartment.
  11. Replace the fuel filter.
  12. Install the fuel sender assembly.
  13. Install the fuel tank. See INSTALLATION .
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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.