Maintenance accessories from the market, due to poor conditions of the use of diesel engines, diesel sulphur and miscellaneous high quality, pumps Choke product quality and reliability with foreign brands still lag, in the car or during the use of the diesel engine fuel injection system will generally for maintenance and replacement of the plunger, filling valve nozzle for precision dual three pieces. Although in recent years have significantly improved product reliability, conditions gradually improved, but because motor vehicles and diesel increase in the volume of tenure, maintenance accessories market is still a big market. Industry production of the three dual more than 50 percent of production for maintenance, which is the industry in the small enterprises, and private enterprises rely on the survival of the market. At present the urban and rural areas across the country pump maintenance Choke points are self-employed, they generally use lower prices, not a long life-and three pairs to get more profit and maintaining its shorter maintenance cycle, increasing replacement of three-and the number of , and that the pump fake and shoddy products mouth opened a channel.