As one of the key components of EFI engine fuel injector, it will seriously influence the working performance of the engine. Nozzle clogging will seriously affect the performance of the car. Congestion is due to carbon deposition engine inner product in nozzle or due to impurities in the fuel injector nozzle clogging of channels. The car after a period of time, the fuel system will form certain sediments. The formation of sediment and the fuel directly related to: first as a result of gasoline containing gelatinous, impurity, or in the process of storage and transportation into the dust, impurities, days and months multiplying in automotive fuel tank, inlet pipe and other parts of the formation of similar clay sediments; secondly because gasoline in the unstable components under certain temperature, reaction formation, glia and resinous dope. The viscous material in the nozzle, air inlet valve and other parts, combustion, sediment becomes hard coke. In addition, because the city traffic jam, cars are often low and idle state, will aggravate the sediment formation and accumulation. Fuel system sediments of great harm. Sediment can clog the nozzle needle valve, the valve hole, effect of electronic injection system precision components work performance, leading to dynamic performance