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But the fuel filter is in series between the pump and throttle body inlet piping. The effect of fuel filter, is to put the containing iron oxide in the fuel oil, dust and other solid impurities removed, to prevent the fuel system block (especially the nozzle). To reduce mechanical wear and ensure the stable operation of engine, and improve the reliability. Structure of fuel is an aluminum shell and an inside of the stainless steel stents, on the stent is equipped with high efficiency filter, filter paper pieces into chrysanthemum, to increase circulation area. Efi filter cannot with the oil filter. Because efi filter often bear the fuel pressure of 200-3000 kpa, so the strength of the filter pressure is generally require reached more than 500 kpa, while the oil filter is not necessary to achieve such a high pressure.