The main materials are high-quality materials of international brands and domestic joint venture brands, of which the filter materials are imported from South Korea Oslon Ahlstrom, American Hollingsworth & Vose, German Gesno Gessner and other imported filter materials and domestic high-quality filter materials, and the filter paper is thermally cured. Reliable removal of contaminants. Because the fuel system uses high quality filter media, it can be protected from very small pollutants, so it will not be damaged by corrosion. This not only protects the engine, but also ensures the efficient operation of the vehicle. By adjusting the pressure and by re-circulating the excess fuel from the injection pump to the tank, the required stability of the fuel supply is finally achieved.