My tanks have normal vents like any other tank, it's that the fill caps are on the tanks themselves. When filling, the vent is not in play, it vents through the big fill opening. When running the vent is in play.
I probably am violating a rule by being able to spill fuel into bilge, but I like better this way. Filling normal tanks almost guarantees spilling fuel. Never had a spill on mine.
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