It happened to me too. In Germany when I was 750 miles from home. Absolutely pissing down when I came out of the hotel. I wanted to check how much petrol I had in the tank and when I open the cap all the water that was gathered in the rim fell into the tank. It seemed like it was a lot of water but in reality it was very little. With little option to ride on the bike never missed a beat.
MH
MH