Where did my gas go?

[skeazle]

I have a 1930 Tudor sedan that I keep at my In-laws garage when I'm not using it. About a month ago I took it over there and parked it there with about a quarter tank of gas and today I went over to start it up to bring it back home and it ran for maybe 1 minute then quit. I looked at the fuel gauge and it was plum empty. We know there is no foul play involved and there is no puddle on the floor so where could the gas have gone? Is it possible for it to have evaporated from the tank? The garage is not hot inside and the gas cap is on. This also happened to my sister-in-laws 1930 Woody after it was stored over the winter months. They know it had plenty of fuel when they parked it but when they went over to get it out of storage it was empty of fuel. Has anyone else ever had this happen? Lucky I only live 1 mile away so I put 1 gal.in and got it home. Jim