Quote:
Originally Posted by CZroe
I assume the vent is deliberately constricted so it isn’t just breathing in nightly condensation to fill up with water or evaporate fuel.
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The vent should be free to let pressure in or out pretty quickly. They do get clogged though, and if the vent gets partially blocked it might let enough air leak in to let the engine run, but not fast enough to prevent a vacuum if you get a sudden cooling situation. It's not designed to be partially restricted like that though.