How Often Should the Fuel Filter Be Replaced and at What Mileage?

[Rosalie]

For external fuel filters, replacement is typically required every 20,000 kilometers driven. Built-in fuel filters generally need replacement every 40,000 kilometers. Below are the hazards of not replacing the fuel filter for an extended period: Difficulty Starting When Hot: Issues like faulty ignition coils, dirty throttle bodies, or spark plug problems can cause difficulty starting a cold engine. However, if the engine struggles to start even when hot, it may indicate a fault in the fuel system. Severe Reduction in Vehicle Power: A clogged fuel filter can lead to low fuel supply pressure, reducing engine power. It may also cause decreased injection pressure, resulting in a lean air-fuel mixture, incomplete combustion, and symptoms like engine shuddering while driving. Idle Vibration: As the fuel filter begins to clog, it causes a gradual drop in fuel pressure, making fuel delivery increasingly difficult. Insufficient fuel pressure can lead to idle vibration.