The Merchant Automotive Fuel Injector Return Line Set replaces both the left and right bank injector return lines on 2004.5–2010 LLY, LBZ and LMM 6.6L Duramax engines. The return lines carry leak-off fuel from each injector back to the fuel return system. Factory lines often harden, crack or leak at the fittings with age and heat. This set uses durable metal fittings in place of the original plastic and includes all 8 retainer clips, so you can replace the entire return circuit in one job.
Key Features
- Complete set: left and right bank injector return lines
- Metal injector fittings for a stronger, longer-lasting connection than plastic
- Includes 8 injector return line retainer clips
- Lines are cut to length and assembled at install for an exact fit
- Fits 2004.5–2010 LLY, LBZ and LMM 6.6L Duramax
Benefits
- Stops fuel leaks from cracked or brittle return lines and fittings
- Metal fittings resist cracking during injector service
- One set covers both banks, with no separate clip order needed
- Ideal to install alongside new injectors
Installation Note
The return line hose must be cut to length and assembled to the fittings before installation.
Fitment
- 2004.5–2010 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax (LLY, LBZ, LMM)
- 2004.5–2010 GMC Sierra 2500HD / 3500HD 6.6L Duramax (LLY, LBZ, LMM)
Prefer the standard fittings? See the Merchant Automotive Injector Return Line and Clip Set. Need just one side? See the Left Injector Return Line or Right Injector Return Line. Replace the seals at the same time with the Injector Fuel Return Line Seal 8-Pack.
What's Included
- (1) Left bank injector return line
- (1) Right bank injector return line
- Metal injector fittings
- (8) Injector return line retainer clips
