Electronic unit pump(EUP) used microelectronics technology to control the fuel injection pump oil and fuel supply advance Angle, it can meet the National Ⅲ and National Ⅳ emissions requirement and can save energy consumption, apply to high pressure fuel injection pump of medium high speed diesel engine and it is core component of diesel engine. It provided fuel oil for diesel engine at fixed time, with fixed pressure and fixed quantify. The EUP was small in size, compact structure and had the characteristics of energy conservation and environmental protection. It is mainly used for cars, pick-up trucks and light trucks etc.