The experts say about every 30,000 miles or every two years to change a fuel filter. You can remove the filter and blow through it to check for dirt. If you can blow through it fine it doesn't need to be replaced.
〉 Answered on Sep 4th, 2012 by Colleen McGee, Driving Instructor at Americas Driving School
General rule recommends changing fuel filters at 50K miles.
〉 Answered on Sep 4th, 2012 by Jo An Holt, Automotive Journalist at Holt & Associates
George, vehicles can vary on the recommended interval, but a good general rule of thumb is every 30,000 miles, if it has an external filter. Some vehicles are equipped with a filter in the gas tank that is not serviceable. When in doubt, your manual will have the specific recommended interval for your car, otherwise contact your local service professional and they can look the information up for you on your specific vehicle.