Summertime: Gas tank overflow question

[dspeer]

I am a new, proud owner of a 1972 280SE 4.5.

I recently took the beauty to work. It was about 90 degrees, and the sun was shining. For the first time ever I filled her up completely, not remembering that in hot weather you're not supposed to do that.

About 30 minutes later there was a puddle of gasoline under the tank. It was dripping pretty good until I opened the gas tank. The tank was under A LOT of pressure. As far as I could tell it was dripping from the area where the hoses are attached to the tank.

I tried to read up on this but couldnt' find an answer: Is this was it's supposed to do when the pressure in the tank gets too high? If so - where exactly is it dripping from?

If not - what is likely to be the problem? Insufficient ventilation of the tank? How is the tank ventilated anyway? Should I take the tank off completely to find out?

Any response or link to another source appreciated!

Thanks!