WCFab LML CP3 Conversion Kit; We offer TWO different styles kits, and we often get asked, what is the difference? In this video we explain, Street Series Vs Race! What is a CP3 Conversion? The Factory CP4.2 Pump Found on 2011 and newer Duramax's has been known to be a problematic component. Even the slightest amount of fuel or water contamination can ruin the pumps internals leading to metal debris flushing throughout the entire fuel system. When these pumps fail it can lead to a repair job usua