2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Fuel System & Fuel Upgrades

The factory fuel system on your 2004.5-2005 GM Duramax 6.6L LML doesn’t provide the cleanest fuel injection, leading to prematurely worn injectors and various other complications down the line. At Alligator Performance, we offer a range of premium aftermarket fuel systems and accessories designed to extend the life of your injectors by ensuring optimal fuel filtration. Our complete aftermarket fuel systems include a fuel pump and water separator that filter diesel fuel in your GM 2500HD/3500HD to extremely low micron levels, preventing contaminants from damaging your engine. For trucks operating in cold conditions, consider our Electric Heater Kits to eliminate the risk of fuel gelling, which can hinder cold starts. We carry trusted brands such as FASS, AirDog, Irate Diesel, and more to provide you with the best fuel upgrades for your 2004.5-2005 GM 2500/3500 Truck. Pair your fuel system upgrades with our Engine Upgrades! GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.