A fuel filter's main purpose is to remove contaminants from fuel before it reaches the engine. By doing so, it helps keep the engine clean and running smoothly. Fuel filters are typically located between the fuel tank and the carburetor or fuel injectors. Some engines have an in-line fuel filter, while others have a canister-type filter. Fuel filters come in different sizes and styles, but most work in a similar way. Contaminants such as dirt, dust, and rust particles are trapped in the filter media as fuel passes through. The filter media is made of pleated paper or synthetic fabric that captures contaminants and allows clean fuel to pass through. Over time, the filter media can become clogged with contaminants, restricting fuel flow and causing engine performance problems. When this happens, the filter needs to be replaced. Fuel filters are an important part of any engine maintenance program. They should be checked regularly and replaced as needed to keep your engine running smoothly.