CP4 Pump? This High Pressure Fuel Pump is found in your 2011-2014 Ford Powerstroke and 2011-2016 LML Duramax. These pump have been known to fail for a number of facts and assumptions. One fact as we discuss on the channel is our customer truck died, would not start and was towed to the shop. After pulling the Fass Filters and finding metal in the filters we went to the VCV on top of the CP4 pump. As shown metal was minimum "this pump had not yet failed." But one problem existed metal was in the entire low and high pressure fuel system. Watch to see our approach towards this issue and our solution to this problem.

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