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I mean when you are pouring out the fuel. Without a vent to allow air in as fuel leaves you get that surging...glug...glug...glug. That is easy to remedy thoughWhen sitting closed containing fuel?
They don't, same as Your chainsaw fuel tanks (though those can breathe IN!).
Thick plastic holds the pressure.
They just breathe with the fuel, expand on heat & retract on cold.