Complete Fuel Systems

Provide the ultimate protection for your injection system and supply the relentless fuel volume required to support massive horsepower on your 2007.5–2010 Chevy Silverado or GMC Sierra 2500HD/3500HD with our selection of LMM Duramax complete fuel systems. From the factory, the 6.6L LMM does not utilize an in-tank or inline lift pump, forcing the Bosch CP3 injection pump to pull fuel all the way from the tank under a continuous vacuum. This suction process places severe strain on the CP3 and naturally introduces entrained air vapor into the fuel lines, which can lead to erratic rail pressure, sluggish acceleration, and premature injector failure—especially when running aggressive custom tuning or hauling heavy loads. Upgrading to a complete aftermarket fuel system completely eliminates this design flaw by pushing a steady, high-volume supply of pressurized, deeply filtered fuel directly to your CP3 pump. These comprehensive kits include everything you need for a total fuel delivery overhaul in one convenient package, featuring a high-flow lift pump with advanced water separation, upgraded larger-diameter fuel lines, wiring harnesses, and all necessary mounting hardware or tank sumps. We supply industry-leading complete fuel systems from trusted brands like FASS Fuel Systems and AirDog. Browse our complete inventory of 6.6L LMM Duramax complete fuel systems below to eliminate fuel starvation and build a bulletproof drivetrain.