Industrial Injection 11-16 Duramax 6.6L LML CP4 to CP3 Conversion Kit w/o Pump (Tuning Reqd)

When you get this Industrial Injection CP4 to CP3 conversion kit, you're getting the necessary components to swap out the factory CP4 injection pump for a more robust CP3 pump. This kit is specifically for the 2011-2016 Chevrolet Silverado 2500 HD and GMC Sierra 2500 HD models equipped with the 6.6L LML Duramax engine. The CP4 pump has a known history of issues, especially when fuel quality is less than ideal, and this conversion addresses that concern by replacing it with the widely trusted CP3 pump, which has a proven track record for durability and reliability in demanding conditions.

This kit includes all the brackets, lines, and fittings you'll need to make the physical swap from the CP4 to the CP3. It's important to note that this kit does not come with the CP3 pump itself, so you'll need to source that separately. Because the engine's computer needs to understand the new pump, custom tuning is absolutely required after installation to ensure proper operation and prevent potential damage. This conversion is a popular choice for Duramax owners looking to improve the long-term reliability of their fuel system, especially if they plan on towing or operating in areas where fuel quality can be a concern.

Installing this conversion is a significant modification that requires mechanical expertise and the correct tools. Remember that this kit is not CARB approved and cannot be shipped to California. Once installed and properly tuned, you can expect a more dependable fuel system that's less prone to catastrophic failure compared to the stock CP4 setup.