Diesel Engine Parts for Cummins K50 KTA50-M2 PT Fuel Injection Pump 4025439 8700. Engine Type::Diesel engine. Applications:Heavy duty truck, buses, engineering machinery, mining machinery, petroleum machinery, railway machinery. Port machinery, stationary and mobile diesel generator set power stations, Marine propulsion unit and auxiliary power unit. ? Item Con dition Items must be unused, in original condition, with all accessories included.