Merchant 12639000 Injector Return Line | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features:

• Fits 2011–2016 6.6L Duramax LML engines
• Compatible with Silverado and Sierra 2500HD/3500HD
• Direct replacement for OEM injector return line
• Designed for long-lasting fuel system performance
• Built with durable, high-quality materials
• Manufactured using advanced production technology
• Resistant to heat, fuel, and engine vibration
• Helps prevent leaks and return flow issues
• Ideal for restoring proper fuel pressure balance
• Engineered to meet or exceed OEM specifications
• Easy to install with proper tools
• Offers excellent value at an affordable price

Keep Your Fuel System Tight With A Clean Reliable Upgrade

If you’ve been chasing down leaks or inconsistent fuel return issues on your LML Duramax, upgrading your injector return line is a simple fix that can go a long way. The Merchant 12639000 Injector Return Line is built to last and made with high-quality materials that stand up to heat, vibration, and daily driving abuse. It’s a direct-fit solution for 2011 to 2016 Silverado and Sierra HD trucks, giving you peace of mind that your fuel system is sealed and performing the way it should. Whether you're replacing a brittle factory line or doing preventative maintenance during an injector swap, this line delivers quality without the dealership markup. It’s one of those small components that can make a big difference in your truck’s reliability. Installation is straightforward, and once it’s in place, you can stop worrying about fuel seeping down your block or throwing off your fuel pressure. Clean, simple, and built for real-world use, this is a smart upgrade that just makes sense.

Engineered For Durability Under Pressure And Heat

The Merchant 12639000 Injector Return Line is designed to replace the factory return system on 2011 through 2016 6.6L Duramax LML engines. It serves a critical role in maintaining proper fuel pressure by ensuring excess fuel from the injectors is consistently and cleanly returned to the tank. Constructed with durable, heat-resistant materials, this return line is built to handle the high temperatures and constant vibration found in heavy-duty diesel environments. The direct-fit design eliminates the need for cutting or custom routing, making installation efficient and secure. Its robust construction helps prevent leaks and pressure drops that can lead to drivability issues, hard starts, or fuel system errors. Whether you're doing a full injector job or replacing aging components, this line is a reliable solution backed by thoughtful engineering. It is manufactured with the customer in mind, combining long-term reliability with ease of service and a price that respects your budget.

Fits: 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Designed specifically for 2011–2016 GM 6.6L Duramax LML engines
• Direct replacement for factory injector return line
• Helps resolve leaks and fuel pressure inconsistencies
• Made from high-quality, heat-resistant materials
• Built to withstand long-term exposure to engine vibration
• Ideal for preventative maintenance or during injector replacement
• Does not require modifications for installation
• Engineered using modern manufacturing technology
• Provides a clean and secure seal for fuel return function
• Designed with durability and customer ease-of-use in mind