The fuel filter is a pipeline in series between the fuel pump and the throttle valve body inlet. The function of the fuel filter is to filter the iron oxide contained in the fuel. The structure of the fuel filter is composed of an aluminium shell and a stainless steel bracket. The bracket is equipped with high efficiency filter paper, which is chrysanthemum-shaped to increase the flow area. EFI filters can not be used with carburetor filters. Because the EFI filter often withstands the fuel pressure of 200-300 KPA, the pressure strength of the filter is generally required to exceed 500 KPA, while the carburetor filter is not necessary to achieve such a high pressure.