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The filtration mechanism of the fuel filter is basically divided into two types: interception filtration and adsorption filtration. When the filtration efficiency requirements are not high, for example, for the filtration of particles over 30 microns, the basic particle diameter is larger than the pore diameter of the filter material, it is a typical interception filter, but for particles under 5 microns, the diameter is smaller than the pore size of the filter material, and it belongs to the adsorption filter, which is mainly used for high-performance diesel filter, and applied in electronic control common rail system diesel engine. The paper filter element is widely used in gasoline and diesel fuel filter element, which has the advantages of good passing performance, high filtering efficiency, simple structure, low cost and easy maintenance.
As a fuel, it is inevitable to the quality and cleanliness of oil has certain requirements. Because of the reason of refining processing, the finished fuel contains some impurities, moisture and colloid. The function of the fuel oil filter element is to filter out these sundries in the fuel oil and supply clean fuel oil to the engine. If the fuel filter is bad, the debris in the gasoline easy to plug the carburetor in the small hole, make the carburetor work bad, flammable mixture become thin, diesel fuel debris into the fuel injection pump, easy to accelerate the wear of precision parts, reduce pump oil pressure. If the water in the fuel, the colloid enters the cylinder, can cause the combustible mixture to burn badly, causes the engine the power performance to drop. The gasoline fuel filter element generally only has one stage, is installed between the gasoline tank and the gasoline pump or between the gasoline pump and the carburetor. In order to improve the filtration efficiency, there are usually two or more grades of diesel fuel filter element, because there are three kinds of precision couplings in the diesel engine supply system, which require a higher degree of cleanliness of diesel fuel and a higher content of colloid in diesel fuel, diesel fuel is divided into coarse and fine filter, also known as oil-water separator and diesel fine filter. Are installed in the diesel tank and fuel pump, fuel pump and fuel injection pump between, some diesel engines are also equipped with a precipitation cup, used to precipitate the moisture and impurities in diesel fuel.