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Home >> GMC >> 2003 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls - System & Component Testing - 4.3) >> Fuel Systems >> Fuel System Cleaning >> Cleaning Procedures

Cleaning Procedures

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  1. Disconnect negative battery cable.
  2. Remove fuel sending unit assembly.
  3. Inspect fuel strainer. Replace a contaminated strainer and inspect fuel pump.
  4. Inspect fuel pump inlet for dirt and debris. Replace fuel pump if you find dirt or debris in fuel pump inlet.
    5. NOTE: When flushing fuel tank, handle fuel and water mixture as a hazardous material. Handle fuel and water mixture in accordance with all applicable local, state and federal laws and regulations.
  5. Flush fuel tank with hot water.
  6. Pour water out of fuel sender assembly opening.
  7. Rock the tank to be sure that removal of the water from tank is complete.
  8. Install sending unit.
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