by 
The Curious Bag
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<h4 class="dechead">On One Hand: Replace It Every 12 Months
You should replace the fuel filter on your vehicle every 12,000 miles or 12 months. The filter helps trap rust, dirt and other contaminants that may find their way into the pressure regulator, injectors and the combustion chamber. A dirty or clogged filter will prevent the fuel from burning properly.
On the Other: Some Car Models Vary
Some vehicle manufacturers recommend replacing the fuel filter at longer intervals, about 30,000 miles or more. These are special filters designed to keep working for a longer period without much impact on fuel system pressure.
Bottom Line
Change the fuel filter at the specific intervals recommended by your vehicle's manufacturer. If you don't replace the filter every 12 months, however, it's a good idea to check the fuel system pressure at regular intervals after that period. The rapid accumulation of contaminants on the filter element will restrict adequate fuel flow at high engine speeds, reduce engine power and affect fuel pump operation.
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