I have heard of this, its the fuel evaporating causing the air pockets at the highest points.
If the filter is horizontal, air will got to the top and fuel on the bottom. If the filter is vertical, fuel will fill up from the bottom, thus displacing the air as it fills. Then, as the fuel evaps when hot, it will vent at the carb and out its vent.
I would like to read of others opinions......
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