20-23 GM 6.6L L5P Duramax GM Fuel Feed And Return Line Set

Fits: 2020-2023 GM 6.6L L5P Duramax 

• Carries fuel from tank-engine (feed) and returns unused fuel back to tank (return) 

If your truck had contamination (metal in fuel), replacing these lines is standard practice. It is a direct-fit replacement part engineered by GM for durability and proper fuel system operation. Built to handle high-pressure diesel fuel systems. Made from durable, heat-and pressure-resistant materials.

• Supplies clean fuel to the high-pressure injection system.
• Circulates unused fuel back to the tank to:
  • Maintain proper pressure
  • Help cool the fuel system
• Critical for engine performance and injector longevity

It is usually replaced when: 

• Fuel system contamination (metal shavings, pump failure)
• Leaks or corrosion in factory lines
• Major fuel system service or rebuild

GM: 12729812