Duramax 6.6L LML Fuel Contamination Kit 11-16 GM 6.6L Duramax LML XD517 XDPThe XDP Duramax 6. 6L LML Fuel Contamination Kit XD517 is an all inclusive kit that provides everything you need to get your 2011 2016 GM 6. 6L Duramax LML back on the road. When the CP4 injection pump fails in your truck, it often sends contaminants through the entire fuel system. This results in debris from the pump that can contaminate the fuel lines, fuel injector lines, and fuel rails, meaning you now have to replace all of the aforementioned