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Originally Posted by Bebopp I don't see how this can happen - the water in gasoline is already "condensed", i.e. it's already in the gasoline, and the only way for it to condense in the tank walls is for it to evaporate from the gasoline. This means you have to heat up the gasoline to get the water to evaporate, then the evaporated water can condense to go back in the gasoline... this clearly doesn't happen.
Once there is water in the gasoline, and you pump it in your tank, it will stay there until it gets sucked into the engine, or it gets mixed with the ethanol.
Water in gasoline is rarely a problem in city environments - maybe in remote areas where storage or transport isn't perfectly sealed... |
When you draw fluid out of closed tank, you will pull a vacuum in the tank which will prevent fuel draw and cause pump cavitation. The pressure is equalized through vents which let air into the tank to replace the volume of the fluid withdrawn. The air is of course, ambient air, which contains moisture. If the tank is refilled while the temperature of the air is above dewpoint, the "moist" air will be expelled during the filling process (which of course with today's vapor recovery systems, means that moist air will go back into the underground storage tank). If the tank cools below dew point (say, you fill up in the morning, drive off some portion of the tank which is replaced by ambient air, then park the car for the night), the moisture in the air will condense, just as it does on the outside of your car (dew).