About the installation of oil-water separator: If you want to install oil-water separator in 4S shop, the equipment will be different according to different uses, so there is no agreement. In addition, the principle of oil-water separator is different, which needs to be judged according to the model of equipment. The oil-water separator of ordinary cars will not be damaged, as long as the oil-water ratio is normal. There are many oil-water separators in catering industry, so it is necessary to clarify the working principles of different equipment. It should be noted that the solid waste in sewage must be cleaned up, no matter what type of oil-water separator it is, otherwise it will affect the normal operation of the equipment and even damage the equipment. If you install an oil-water separator, you need to install it in a repair shop, but you can't install it yourself. Its function is to remove water from diesel oil, thus reducing the failure of injector and prolonging the service life of engine. According to the density difference between water and fuel oil, impurities and water are removed by gravity sedimentation principle, and there are separation elements such as diffusion cone and filter screen inside. The oil-water separator also has other functions, such as preheating fuel to prevent wax deposition and filtering impurities. Classification of oil-water separator: 1. Oil-water separator for automobile is an instrument for separating oil from water, which is mainly divided into water separator in oil and oil separator in water in mechanism. In terms of use, it is mainly divided into industrial oil-water separator, commercial oil-water separator and household oil-water separator. 2. According to the separation principle, there are oil-water separators with membrane filtration, oil-water separators with lipophilic substances, unpowered oil-water separators with different specific gravity and different layers, and oil-water separators with pharmacological effects. It is impossible to install an automobile oil-water separator without certain professional knowledge. About the drainage method of the oil-water separator: The first task is to open the machine cover and put the container (with a capacity of about 0.2L) at the end of the ethylene hose under the drainage plug of the oil-water separator; Then unscrew the oil plug counterclockwise (about 5 turns), operate the diesel filter and the manual oil pump about 10 times left and right, and drain it to the oil-water separator and fill it with fuel; Finally, tighten the oil drain plug clockwise after draining oil, and then press the manual oil pump several times left and right.