What are the fuel filter principle and fuel filter maintenance?

Summary: It is very important to clean the fuel filter. The fuel filter is stringed on t...
It is very important to clean the fuel filter. The fuel filter is stringed on the pipeline between the fuel pump and the fuel inlet of the throttle body.


The function of the fuel filter is to remove the iron oxide, dust and other solid impurities contained in the fuel, prevent the fuel system from clogging, reduce mechanical wear, ensure the stable operation of the engine, and improve the reliability. The structure of the fuel filter is made of an aluminum alloy. The shell is composed of a stainless steel bracket inside. The bracket is equipped with a filter paper assembly. The filter paper is seen as a chrysanthemum to increase the flow area. The EFI filter cannot be used in common with the filter of the carburetor. Because the EFI filter often bears the fuel pressure of 200~300kPa. Therefore, the pressure strength of the filter is generally required to reach more than 500kPa, and the filter of the carburetor cannot meet the requirements.


BMW-X1(E84)、X3、X4 Filter


The fuel filter must be replaced every 30,000 kilometers. If the fuel content is large, the driving distance should be shortened accordingly. The arrow on the fuel filter housing indicates the direction of fuel flow. When installing the fuel filter, it is not allowed to install it upside down. Even if it works in the flip-chip state for a short time, it must be replaced.