2004.5-2010 GM/CHEVROLET 6.6L DURAMAX LLY, LBZ & LMM INJECTOR RETURN LINE KIT
Keep your fuel system operating efficiently with this premium-quality Injector Return Line Kit, engineered for 2004.5–2010 GM/Chevrolet 6.6L Duramax diesel engines including LLY, LBZ, and LMM models. Designed to replace aging or leaking factory return lines, this kit restores proper fuel return function and prevents hard starts, fuel leaks, and injector performance issues.
Built from durable materials to withstand high temperatures and diesel exposure, this kit is an essential upgrade or replacement during injector service or preventative maintenance. It provides a secure, leak-free seal and consistent fuel return to the tank.
What’s Included in the Kit:
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1 - Return line hose
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4 - Return adapters
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4 - O-rings
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4 - Adapter retaining clips
Features & Benefits:
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Restores Proper Fuel Return: Eliminates leaks and restores proper fuel circulation to prevent injector imbalance or engine roughness.
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Direct Fit for 6.6L Duramax Engines: Designed to match OE specs for a seamless installation on LLY, LBZ, and LMM models.
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Built to Last: Fuel-resistant hoses and quality hardware ensure durability under extreme heat and pressure.
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Pre-Cut and Ready to Install: Simplifies the replacement process without the need for additional trimming or modifying.
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Essential During Injector Work: A smart add-on for anyone replacing or servicing injectors—helps prevent future fuel return issues.
Compatibility:
Fits the following models with the 6.6L Duramax engine:
• 2004.5–2005 Chevrolet/GMC Silverado 2500HD/3500HD – LLY
• 2006–2007 Chevrolet/GMC Silverado 2500HD/3500HD – LBZ
• 2007.5–2010 Chevrolet/GMC Silverado 2500HD/3500HD – LMM
• Also fits corresponding GMC Sierra HD models for same years and engine codes
To confirm compatibility, verify your VIN’s 8th digit:
• LLY = “2” | LBZ = “D” | LMM = “6”
This injector return line kit offers a straightforward solution to one of the most common causes of diesel fuel system inefficiency. Whether you're performing injector maintenance or troubleshooting a hard-start issue, replacing worn return lines can drastically improve your engine's reliability and drivability.
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✔️ Orders placed on weekends or holidays will be processed on the next business day.
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California Proposition 65 Warning:
This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
OEM: 97328733 / 98062291 / 26410P
