2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Injection Pumps

The stock CP3 fuel injection pump on your 2004.5-2005 GM 6.6L Duramax LML is adequate for everyday use, but it may not deliver the efficiency needed for heavy-duty applications. Our upgraded injection pumps are designed to enhance performance during towing, off-roading, or hauling, providing improved fuel flow and pressure. This results in better throttle response, increased power, and more efficient fuel combustion. Upgrading your injection pump is crucial for ensuring engine reliability and optimal performance, especially under demanding conditions. Elevate your Sierra/Silverado's fuel system performance with our premium replacement or upgraded CP3 pumps available at Alligator Performance! Check out our full selection of Fuel 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.