
Buy a pair. Use one, keep one as a spare. You don't have to replace them too often. Periodically check the water content of the fuel with a clear jar or cup. Pour in the contents of the filter, let it sit for a few minutes and see how much water you have at the bottom. If it is over 1/4, you need to watch it closely and replace the filter twice per season as the filter element is clogged with water. Unless. Check it once a year.

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