Complete Fuel Systems

Eliminate fuel starvation, protect your high-pressure injection pump, and support substantial horsepower gains on your 2004.5–2005 Chevy Silverado or GMC Sierra 2500HD/3500HD with our selection of LLY Duramax complete fuel systems. Because the factory 6.6L LLY setup relies entirely on the engine-mounted CP3 pump to pull fuel under vacuum across the full length of the truck, the system is highly susceptible to cavitation, air entrainment, and dropped rail pressure under load. Installing a complete aftermarket fuel system supplies a continuous 8–10 PSI of positive pressure directly to the CP3 inlet while removing air, water, and microscopic contaminants down to 2 microns. We supply complete lift pump packages, high-capacity fuel sump kits, fuel rail plug upgrades, high-flow draw straws, and complete tank-to-engine plumbing solutions from industry-leading manufacturers like FASS Fuel Systems, AirDog, Fleece Performance, and S&S Diesel Motorsport. Browse our complete LLY Duramax fuel systems below to build a reliable, clean, and high-volume fuel delivery setup.