UnderDog Diesel LML Duramax Low Pressure Line Conversion - CP3 Swap Upgrade Kit | 2011-2016 Duramax 6.6L LML

This kit is designed as an upgrade for CP3 conversion setups, providing a cleaner, more reliable solution for low-pressure fuel routing. It eliminates the factory valley connection that is known to leak and be difficult to service after installation.

By rerouting the low-pressure fuel line outside of the engine valley, this kit improves accessibility, simplifies maintenance, and delivers a cleaner overall install—especially when paired with an aftermarket lift pump.

Note: This kit is not required if you are currently running CP3 conversion kits from UnderDog Diesel (UDD), Screamin Diesel Performance (SDP), or John C Garage (JCG), as those systems include similar components.

What’s Included:

• 36" Gates 1/2" fuel hose
• 5" Gates 5/16" fuel hose
• 3–4 worm gear hose clamps (varies by model year)
• 2 fuel injection-style hose clamps
• Quick connect 90° fitting (2012–2016 models only)
• Billet quick connect coupler (2012–2016 models only)
• Billet Wye fitting

Key Benefits:

• Eliminates failure-prone factory valley fuel connection
• Prevents leaks caused by improperly seated flare fittings
• Routes fuel line outside the valley for easier access and service
• Provides clean fuel supply routing to CP3 systems
• Ideal for use with aftermarket lift pumps and filtration setups

Optional Upgrade: Compatible with the Fleece molded feed hose for retaining the factory fuel filter (sold separately).