Diesel Fuel Injector Return Line Assembly for 2004.5-2010 Duramax

Our review of this diesel fuel injector return line assembly finds it best suited for owners and mechanics working on 2004.5-2010 GM Duramax 6.6L LLY, LBZ and LMM engines who need a durable, direct-replacement set to stop leaks and brittle-hose failures. The bottom line: this kit replaces worn or cracked return lines with thicker nitrile rubber hose and aluminum connectors that resist corrosion, so it addresses the common heat- and age-related failures without complicated modifications.

Key Features

• Aluminum connectors: Corrosion-coated aluminum fittings reduce the chance of breakage during installation and resist long-term corrosion compared with plastic fittings.
• Nitrile rubber hose: Thickened, oil-resistant nitrile rubber provides improved longevity against fuel exposure and heat stress compared with original brittle hoses.
• Nylon braid and outer layer: A reinforced nylon braid and protective outer layer improve abrasion resistance and thermal insulation to reduce hose degradation.
• Direct replacement fit: Supplied to match OEM return line routing and replace part numbers 98062291, 97328732, 97328733, and 97359750 for a straightforward swap.
• Complete kit contents: Includes both left and right injector return lines, eight retainers, two O-rings and two stainless clamps to make installation complete for most repairs.

Who It's For

This kit is ideal for DIY mechanics, fleet technicians, or owners of 2004.5-2010 Chevrolet Silverado or GMC Sierra 2500HD/3500HD trucks with the 6.6L Duramax engine who are replacing cracked or leaky fuel return hoses and want a more robust material choice. It is also a sensible preventative maintenance purchase for vehicles showing heat-related hose hardening or connector corrosion.

It is less appropriate for vehicles outside the listed year and model range or for customers who require an identical OEM-branded assembly for warranty reasons; those users should verify fitment or seek OEM-sourced parts if a manufacturer warranty or dealer service requirement exists.

Pros & Cons

Pros

• Durable aluminum fittings reduce the risk of connector breakage during installation.
• Thick nitrile rubber and nylon braid increase resistance to fuel, heat, and abrasion compared with older hoses.
• Comes as a full set with retainers, O-rings and clamps, enabling a complete repair in one purchase.

Cons

• Not an OEM-branded part, so some buyers who require factory-branded replacements may prefer to source from a dealer.
• Fitment is limited to specified 2004.5-2010 GM Duramax models and related 2500/3500 chassis; verify vehicle match before ordering.

Specifications

Compatibility	2004.5-2010 GM Duramax 6.6L LLY LBZ LMM; Chevy Silverado/Suburban 2500HD 3500HD; GMC Sierra/Yukon 3/4 TON; Cadillac Escalade 3/4 TON
Replace Part Numbers	98062291, 97328732, 97328733, 97359750
Connector Material	Aluminum alloy with anti-corrosion coating
Hose Material	Thickened oil-resistant nitrile rubber with nylon braid
Included Items	2 return lines, 8 retainers, 2 O-rings, 2 stainless steel clamps
Function	Replace cracked or brittle fuel injector return hoses to prevent leaks

Our Verdict

This return line assembly is a practical, value-focused replacement for owners of compatible 2004.5-2010 Duramax trucks who want more durable materials than aging stock hoses. The aluminum fittings and reinforced nitrile hose reduce common failure modes, and the complete kit contents make it a convenient repair option for DIYers and shops alike.

Frequently Asked Questions

Will this fit my 2006 Silverado 3500HD with a Duramax?
Yes, the assembly lists compatibility with Silverado 2500HD and 3500HD models from 2004-2010 with the 6.6L Duramax; always verify engine and year before ordering.

Are the fittings metal or plastic?
The connectors are aluminum alloy with an anti-corrosion coating, so there are no plastic fittings on the assemblies.

Does the kit include clamps and O-rings?
Yes, the package includes 2 O-rings, 2 stainless steel clamps and eight retainers so most installs are complete with the kit.