I was filling my tank with gas (regular E10 mogas) to check it prior
to bonding it into the module, and noticed something strange that I
could not explain. I have the outlets sealed off. I poured 10 gallons
in and closed off the inlet and the vent hole with rubber caps. After
5 minutes, when I open one of the caps, I can hear a pop, and a puff
of gasoline vapor. I close it off, wait another 5 minutes, and it does
the same thing. I put a tiny hole on the rubber cap to prevent
pressurization, but I am dumbfounded by this observation. Surely, the
vapor pressure of gasoline cannot be higher than atmospheric pressure?
Both the filled jerry cans and the tank have been in the same location
for a couple of weeks, so they should be at the same temperature. What
could be causing this?
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