The structure of the diesel filter is roughly the same as that of the oil filter. There are two types: replaceable and spin-on. But its working pressure and oil temperature resistance requirements are much lower than those of oil filters, and its filtering 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.

Diesel filter can be divided into diesel water separator and diesel fine filter. The important function of the oil-water separator is to separate the water in the diesel. The presence of water is extremely harmful to the diesel engine fuel supply system, rust, wear, seizure and even worsen the combustion process of diesel. Due to the high sulfur content in Chinese diesel, when combustion occurs, it will even react with water to form sulfuric acid to corrode engine parts. The traditional water removal method is mainly precipitation, through the funnel structure. Engines with emissions from National III and above put forward higher requirements for water separation, and the higher requirements require the use of high-performance filter media.

Diesel fine filter is used to filter fine particles in diesel oil. Diesel engines that emit from National III and above are mainly aimed at the filtration efficiency of 3-5 micron particles.

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