Back in the 70's, I found water 4 or 5 times in the fuel samples taken from the wing tanks of my C-170B based at Manassas, VA. The amount was from a few drops to a couple of ounces. Each time I would rock the wings back and forth and re-check; and I did get more water on two occasions. Interestingly, there was no water in the gascolater on any of these occasions, but there was a couple of ounces of water in it on the next check after one of the occasions when I had a couple of ounces in the wings. I assume that it had been from the time before. I always made it a practice to fill up after flying, since it could be up to a month between flights.
Allen G. Wiesner KR-2SS/TD S/N 1118 65 Franklin Street Ansonia, CT 06401-1240 (203) 732-0508 flash...@usadatanet.net