It is recommended to replace the fuel filter of the truck every 5000 kilometers. The function of replacing the fuel filter is:
1. The function of the fuel filter is to prevent particulate matter, water and impurities in the fuel, and to ensure that the precise components of the fuel system are protected from wear and other damage;
2. The fuel filter is connected in series on the pipeline between the fuel pump and the oil inlet of the throttle body, and the structure consists of an aluminum shell and a bracket with stainless steel inside;
3. Generally, 4S recommends that the fuel filter needs to be replaced once when the truck is 5,000 kilometers away. However, it actually depends on the quality of the fuel used by the vehicle. If the fuel impurity content is low, it can be extended to about 30,000 to 40,000 kilometers.

The fuel filter must not be replaced. The fuel filter is generally replaced every 20,000 kilometers. Depending on the brand and model, the replacement time will vary. For the specific replacement time, it is recommended to check the vehicle instruction manual (maintenance manual), which will have a detailed explanation. The fuel filter is also known as the fuel filter element, its main function is to filter the impurities in the gasoline. Gasoline is not pure, it contains a lot of impurities. First of all, gasoline is refined from crude oil through a complex process, and some impurities cannot be avoided during this period. And in the way of transportation to various gas stations, it is inevitable that some impurities will be mixed in. In addition, with the prolongation of use time, impurities will also increase. At this time, the role of the gasoline filter is revealed. When the gasoline filter is used for a long time, there will be more impurities filtered, and there will be clogging, and it needs to be replaced at this time. If the gasoline filter is not replaced in time, the oil circuit will be blocked and the combustion will not be good, which will lead to a large amount of carbon deposits, the vehicle will be dull, abnormally shake, and finally the car will not catch fire, or suddenly turn off while driving. Seriously, the engine is scrapped.