At present, there are few diesel engines for passenger cars, which are basically high-pressure rails; Light commercial vehicles pay attention to the high-pressure rail, while medium and large commercial vehicles pay attention to the pump nozzle. All the above are electronically controlled engines, and no oil pump is needed. Agricultural vehicles and construction machinery are the main ones that need more oil pumps, using traditional VE pumps and in-line pumps. It is also beneficial to learn about diesel engine compared with oil pump, which can increase your understanding of oil supply system, but don't stop there. Learning electronically controlled diesel engine maintenance has a greater future, although it is relatively difficult to get started!