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How often should I replace the fuel filter?

As the filter gets dirty the fuel pump has to work harder (draws more current), and will burn out faster. Also, most fuel systems are “return” types: excess fuel pumped from the tank to the fuel pressure regulator gets returned to the gas tank. Any crud that isn’t filtered out can keep getting recirculated blocking injectors/screens and wearing out the fuel pump. Putting in a new filter every 2 years/30,000 miles is cheap insurance and good preventive maintenance.
There are a number of things that should be done if you plan on keeping a car past 100,000 miles, but most car makers know that most people won’t, so they don’t mention them.