Interesting stuff!
What could go wrong?
I'd still like to know if venting a tank could possibly mess up starting a "known-happy" engine with an unvented tank. Still makes no sense to me unless the engine had somehow been running great with reduced pump pressure, then objected to a few higher psi at the carb inlet. Even that doesn't make sense to me for starting, as it would take a while for vacuum to build in a tank.
As to atmospheric pressure changes acting on large volumes, my favorite example are snack chip bags. Living at 6000 feet, we are blessed by chips getting saved from being crushed because they were packaged at lower altitude. A potato chip bag on our store shelves usually looks like a balloon.
Doesn't take much pressure differential to create a LOT of force on an area as big as a gas tank.
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