Why do Fuel Filters need replacing? It may be obvious that a Fuel Filter filters the fuel in your car. Why is a Fuel Filter important? A Fuel Filter helps protect your Engine, since it filters impurities and particles out of your fuel before it reaches the Engine. Over time, these impurities build up on the Fuel Filter. As your Fuel Filter gets more clogged, less fuel can reach your Engine. If your Car is sluggish when driving up hills, you may need to replace a clogged Fuel Filter. However, since Slow Engine Performance can result from several issues, it’s a good idea to check in with us at 360-688-7111, or stop by 16326 State Route 9 (at 164th) in Clearview anytime.