I let my 640 cool down for 15 to 20 minutes after a hard session of bush hogging. When I cracked the gas cap to check the fuel level a geyser of hot fuel shot 10 feet or more straight up out the filler hole. I'm ok, tractors ok, no fire thank goodness. I can't even find the gas cap, it was brand new, bought from the same online vendor that I bought the new tank from. Must not have been vented. I've noticed pressure being released before when I opened the cap. The location of the gas tank, sitting right over a hot engine still scares me. Heat shields are in place. In the future, that cap (vented now)stays in place until everything is stone cold.
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