2005 Chevrolet Avalanche 2500FACTORY OEM SERVICE PROCEDURE

Fuel System Cleaning

  1. Remove the sending unit. Refer to Fuel Sender Assembly Replacement (Front Tank)  or Fuel Sender Assembly Replacement (Rear Tank) .
  2. Inspect the fuel pump strainer. Replace the sending unit if the strainer is contaminated.
  3. Inspect the fuel pump inlet for dirt and debris. Replace the sending unit if dirt or debris is found in the fuel pump inlet.
    4. IMPORTANT: When flushing the fuel tank, handle the fuel and water mixture as a hazardous material. Handle the fuel and water mixture in accordance with all applicable local, state, and federal laws and regulations.
  4. Flush the fuel tank with hot water.
  5. Pour the water out of the sending unit opening. Rock the tank to be sure that removal of the water from the tank is complete.
  6. Install the sending unit. Refer to Fuel Sender Assembly Replacement (Front Tank)  or Fuel Sender Assembly Replacement (Rear Tank) .
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.