![]() In addition to the higher pressure and lower volume, the removal of sulfur from modern diesel fuel (Diesel #2 or Ultra-Low Sulfur Diesel) also destroys compounds that exist in the fuel naturally that would normally contribute to increased lubricity. Some fuel resellers mix lubricity-increasing additives into their fuel prior to sale, but this is not consistent and not well-regulated. Although this makes it a more efficient pump, the lack of volume creates a lack of lubrication since these pumps rely on the diesel fuel to act as a lubricant. The CP4 injection pump creates higher pressures with less volume than its predecessor, the CP3 pump. ![]() The short answer: lack of lubricity. Lubricity is most commonly defined as the ability of a fluid to minimize the degree of friction between surfaces in relative motion under load conditions. Below we will discuss the reasons for this failure, how to diagnose a pump failure, and show you the parts you need to properly fix your vehicle. Chances are, if you’re looking at this page, you’re well aware of the problem. Failure of this CP4 pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates. The 2011-2016 Duramax suffers from a high pressure fuel pump issue unique to this year range. CLICK HERE to purchase our LML CP4 High Pressure Fuel Pump Failure Kit
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