The structure of the diesel filter is roughly the same as that of the oil filter. There are two types: replaceable and spin-on. However, its working pressure and oil temperature resistance requirements are much lower than those of oil filters, and its filtration efficiency requirements are much higher than those of oil filters. The filter element of the diesel filter mostly uses filter paper, and some also use felt or polymer materials. In addition to filtering mechanical impurities in diesel, a diesel filter also has an important function to filter water. The presence of water is extremely harmful to the diesel engine fuel supply system. Rust, wear, damage to the cylinder piston ring and even cylinder pulling phenomenon can also deteriorate the diesel combustion process. The diesel filter system uses fluid flow control technology according to the density of the liquid to separate water to achieve the effect of filtering water.

Oil-water separator is an instrument that separates oil and water. It is mainly divided into oil-in-oil dewatering separator and water de-oiling separator in mechanism; it is mainly divided into industrial grade oil-water separator, commercial oil-water separator and household oil-water separator in terms of usage. There are several types of separators; in terms of the separation principle, there are membrane filter oil-water separators, oil-water separators using lipophilic materials, non-powered oil-water separators with different specific gravity layers, and pharmacological demulsification oil-water separators; oil-water separators are mainly Used in petrochemical industry, automobile industry, sewage treatment industry, etc.

Automobile oil-water separator is a kind of fuel filter. Its main function is to remove the moisture in diesel oil, so as to reduce the failure of fuel injector and extend the service life of engine. The principle is mainly based on the density difference between water and fuel oil, using the principle of gravity sedimentation to remove impurities and water separator, there are diffusion cones, filters and other separation elements inside. The oil-water separator also has other functions, such as pre-heating the fuel to prevent wax formation and filtering impurities.

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