CYEFI Fuel System Parts. Barrel and Plunger Assembly. Diesel Engine Spare Parts. 6PCS K STC Fuel Injector Spare Parts Oil Cup 3279810 for Cummins Diesel Engine. 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.