2004.5 - 2005 LLY 6.6L Duramax Return Line Kit
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2004.5 - 2005 LLY 6.6L Duramax Return Line Kit

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PRODUCT DETAILS

Keep your fuel return system running properly with this 2004.5-2005 LLY 6.6L Duramax Return Line Kit. Designed for Chevrolet vehicles equipped with the 6.6L Duramax, this replacement kit services the return-line system when existing components are worn or need replacement during fuel-system work. The application-specific fitment makes it a practical choice for maintenance and injector-related repairs.

SKU MDPCRLK
Make Chevrolet
Categories Return Line Kit
Year Range 2004.5 - 2005
Model 6.6L Duramax
OEM Part Numbers

No OEM part number is listed on the product page.

Verify the existing component information and vehicle application before purchase.
Warranty

Covered by the Mississippi Diesel Products warranty against applicable manufacturing defects. See the Warranty Policy for complete terms and conditions.
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  • Replacement return line kit
  • Designed for LLY 6.6L Duramax applications
  • Fits 2004.5-2005 model years
  • Helps maintain proper fuel return flow
  • Suitable for fuel-system maintenance and repair
  • Useful during injector service
  • Application-specific replacement component

Fits:

  • 2004.5-2005 Chevrolet vehicles equipped with the LLY 6.6L Duramax

Engine: 6.6L Duramax
Engine Code: LLY

Verify your vehicle, engine, and existing return-line configuration before ordering.

Specification Details
Product Type Return Line Kit
Condition Replacement
Make Chevrolet
Engine 6.6L Duramax
Engine Code LLY
Model Years 2004.5-2005

FREQUENTLY ASKED QUESTIONS

This kit is listed for 2004.5-2005 Chevrolet vehicles equipped with the LLY 6.6L Duramax engine.

The return-line system routes excess fuel through the fuel system and helps maintain the proper fuel flow within the injection system.

You may need to replace it when existing return-line components wear, become damaged, or need replacement during injector or fuel-system service.

Yes. Damaged or deteriorated return-line components can allow fuel to escape and should be replaced when their condition is compromised.

No. This product is specifically listed for 2004.5-2005 LLY 6.6L Duramax applications. Verify the engine code and model year before ordering.

Yes, professional installation is recommended to ensure the return-line components are installed correctly, and the fuel system remains properly sealed.