This FPE - LML - CP3 - FF - 10 CP3 Conversion Kit is a game - changer for 2011 - 2016 GM LML trucks with 6.6L Duramax engines. Unfortunately, this product has been discontinued. The stock CP4 fuel system in these trucks can only support up to about 500rwhp. It was introduced to cut costs, but it's less reliable and capable than the CP3 used in previous Duramax models. With this kit, you can convert your LML's fuel system from CP4 to the proven and reliable PowerFlo 750 CP3, which can support nearly 850+ RWHP. The kit comes with a high - pressure fuel rail line, fuel rail plug and nut, CP3 block adapter with O - ring, and many other essential components. However, note that improper use may violate laws, damage vehicle components, void the warranty, and more. It's for off - road and competition use only and must be used with custom tuning calibrations.

How to use: First, make sure you have all the necessary tools. Remove the old CP4 fuel system from your 2011 - 2016 GM LML with 6.6L Duramax engine. Then, install each component of the CP3 conversion kit one by one according to the included instructions. Remember to use the right bolts and fittings. Attach the high - pressure fuel rail line, fuel rail plug and nut, and other parts securely. After installation, connect the custom tuning calibrations as required. Things to note: This product is for off - road and competition use only. It may not work well with the EGR cooler installed, depending on the CP3 pump. Incorrect use can break local, state, and federal laws about emissions, traffic, etc. It may also damage your vehicle's components and void the factory warranty. Always follow the instructions carefully. Maintenance advice: Regularly check all the connections in the fuel system. Make sure there are no leaks in the high - pressure and low - pressure fuel lines. Inspect the O - rings and sealing washers for wear and replace them if needed. Keep the CP3 pump clean and follow the recommended maintenance schedule for your vehicle.