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In the early '80s I worked at a small airport as an aircraft mechanic and also did aircraft refueling. Every morning we stuck our underground fuel tanks for level, and we used a paste on the stick that showed how much water was in the tank. Each tank had about 5" of water in it. After we'd receive a load of new fuel we'd stick the tank to confirm the amount delivered. The paste showed about an inch immediately after the delivery. We checked it after several deliveries and found it took almost an hour for the water level to return to normal, so we made a rule that we wouldn't fill the tanks on the refueling truck less than 2 hours after receiving a load. Water in aircraft fuel is potentially deadly. Every morning we drained 5 gallons of gas from each tank on the truck to remove the water that accumulated overnight.
Since then I've never gassed up at a station getting a delivery.
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