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GM 6.6L Duramax LLY, LBZ, LMM Fuel Injector Return Line Kit 2004-2010 | Bostech BD6301637


The Diesel Fuel Return Line plays an important part in the engine's fuel system by returning unused fuel from the engine back to the fuel tank. It prevents flooding in the engine and helps ensures efficient fuel usage.

Bostech Fuel Return Line Kit for GM 6.6L Duramax is designed to the OEM specifications for function. Our universal kit comes with the needed hose, tee and elbow connectors, and clips to replace one side of the fuel return system.

Engine Fitment:

  • GM Duramax LLY / LBZ / LMM

Note: Vehicle application information for reference only and may not include all year, make, and/or models. To ensure correct replacement verify by the OEM part number interchange.

Prop65 Warning:
WARNING: Cancer and Reproductive Harm -
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Bostech / BT-Power's 24-Month Unlimited Mileage Warranty. Our warranty covers product replacement for material and/or workmanship defects up to 24-months from the product purchase date. Technical Support is available by contacting Bostech's Customer Service at 1-800-868-0057 or by emailing An RMA (Return Material Authorization) number given by Customer Service is required for all returns. You can view our Warranty Policy by clicking the "Help Center" at the bottom of the page and going to Policies & Procedures.