[hharney]

I can't dismiss your theory. It is definitely possible and not completely rare. With the sequence you are describing it sounds really possible. I have had intrusion of water from a pump once that I remember. Sometimes I purposely allow a little fuel to over spill in the service port to visually see the fuel and if there are any signs of contaminates. Be careful because fuel spills these days are like big red flags at some of these places. Sure glad you didn't have any problems during the flight. Consider yourself very fortunate.