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Fuel Vent 003.JPG [ 234.75 KiB | Viewed 8612 times ]
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Fuel Vent 001.JPG [ 289.3 KiB | Viewed 8612 times ]
You mean something like this ? Got it from
http://www.aircraft extras .com . I do not have a gravity system but this little gizmo has been on for over 200 hours with no problems . Not sure if Aircraft Extras still makes them/sells it . They may have some old stock . I think I paid $20.00 for 2 + shipping . Looks good and stays out of the way . The aero engineers can jump in here , but I don't think it takes much positive pressure to "pump up the tank ?" Sorry it is a little "fuzzy"
but I think you get the idea .
RB