Filters regardless of where they are installed perform just one basic function and that is to prevent the passage of any particles that could become a source of contamination. Unfortunately, filters after prolonged usage can get clogged and damaged. Once this happen, the particles that they are trying to prevent from entering can finally get inside, in automobiles contamination especially of the fuel can lead to rapid wear and failure of the fuel pump and injectors. Damaged filters have to be changed immediately. But of course make sure that you get only high quality filters like the Sankei filters.Sankei filters are excellent when it comes to screening out dirt and rust from the fuel. These filters also improve the performance of a vehicle. The lesser the contaminants present in the fuel the more efficiently that it can be burned. As mentioned, filters can also fail in their function especially if they have not been changed for a long period of time. Most vehicles have filter schedule indicated in their owner's manual. It is vital for a vehicle owner to be aware of this schedule in order to prevent any damage on the vehicle. Filters need to be changed at regular intervals and you can actually do it yourself.The process of changing the filter involves disconnecting the filter from the fuel line and replacing it with a new one. Again, it would be best to get a high quality fuel filter like the Sankei Filters Fuel Separator because of its efficiency in filtering fuel contaminants plus unlike the other brands this brand of filter is more durable allowing you to enjoy its benefits for a longer period of time. Regular maintenance of the fuel filter can also help a lot in prolonging the life of the fuel filter.