While it is very true that the LML Duramax is very capable of producing a ton of power with simple bolt-ons, or even tuning alone, the stock CP4 injection pump has proven itself to only be able to support around 500 RWHP. Fortunately, Fleece has developed a kit that allows you to convert your LML to the tried and true CP3 pump that’s been used for years, and has proven itself to handle additional fueling demands compared to the CP4.
This kit is available both with and without an injection pump. When opting for the kit with an injection pump, you have the choice of either the Fleece CP3K, which is a factory Bosch pump that has been modified to fuel through 3,000 RPM’s. Or, you can also upgrade to the Fleece PowerFlo 750 for a fully modified pump to meet nearly any fueling demand.
Why convert your LML’s Fuel System from a CP4 to a CP3
- The stock CP4 is only capable of supporting up to ~500rwhp. A stock CP3 is capable of supporting 600+ rwhp in conjunction with the piezoelectric injectors. The reliable and proven PowerFlo 750 is capable of supporting nearly 850+ rwhp.
- The CP4 was introduced as a cost reduction to the LML platform since a smaller amount of fuel is required when running the more efficient piezoelectric injectors. Since its introduction it has proven to be less reliable and less capable than the CP3 used in previous Duramax platforms.