How Many Kilometers Should a Fuel Filter Generally Be Replaced?

[Claire]

External fuel filters can be replaced after the car has traveled approximately 20,000 kilometers, while built-in fuel filters are generally replaced every 40,000 kilometers. The main function of a fuel filter is to remove impurities from the gasoline. A clogged fuel filter can lead to reduced fuel supply pressure and poor fuel atomization. Long-term clogging can worsen the blockage of the three-way catalytic converter and contaminate the spark plugs and front oxygen sensor, resulting in various fault symptoms. Symptoms of not replacing the fuel filter for a long time include: 1. Difficulty starting when the engine is warm; 2. Severe decrease in car power and shaking while driving; 3. Idle shaking. When the fuel filter gradually begins to clog, it can cause insufficient fuel pressure, leading to idle shaking.