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Old 01-05-2021, 11:23 AM
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Quote:
Originally Posted by GregH View Post
Do they simply work on the principle that gas will float on top of the water?
No, they have a fine mesh screen made of some hydrophobic material. The water's high surface tension keeps it from flowing through, while the gas goes through freely.

There are some downsides. The flow rate is somewhat slow, so fueling takes longer. And there is always a small "sump" at the bottom that retains the water and a small bit of gas and must be disposed of. Both of these pale in comparison to having flush and clean out the whole fuel system!
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