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Replacing a fuel filter used to be done in the course of routine car maintenance every 10,000 to 15,000 miles. Thanks to cleaner gas and better fuel filter technology, however, today's new car fuel filters only need to be replaced every 50,000 miles or so on newer cars.
Today's fuel filter keeps debris and other deposits from entering your engine. A clogged fuel filter can result in reduced engine performance and fuel efficiency, and will ultimately lead to more serious problems. If you have an older car, change the fuel filter every year. Fuel tanks corrode and debris accumulates inside over the years, this can clog the fuel filter much faster than on newer cars.