The stock fuel pump on your 2001-2004 GM Sierra/Silverado is adequate for everyday driving, but an upgraded 6.6L Duramax will require a higher volume of fuel for consistent and reliable performance. Give your truck the fuel volume it needs and improve filtration by investing in any of these premium aftermarket fuel lift pumps. An aftermarket fuel lift pump will promote efficiency and improve the overall power of your fuel system so you can get the most out of your ride every single time. Check out our selection ofEngine Upgradesto pair with your new Fuel Upgrades! GM Duramax Fitments: 2001, 2002, 2003, 2004 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.