A fuel filter is a component of the engine system that purifies the fuel, removing any impurities and dirt particles from the fuel before it reaches the engine. The fuel filter is installed in the fuel line, between the fuel tank and the engine, and prevents impurities from entering the engine, where they can cause serious damage. The filter works by trapping dirt and debris, preventing them from passing through to the engine. Over time, the fuel filter becomes dirty and clogged, which can affect engine performance and fuel economy. Therefore, it is necessary to change the fuel filter regularly to maintain the engine's optimum performance.