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Wing Tank Venting..

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mjk51

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My Firebolt has a Steen built upper wing tank. Unvented gas tank cap. Typically vented overboard thru a vent tube at the belly, gear leg.... What are your thoughts on venting the cap and eliminating the vent line. Since the tank must be empty for aerobatic flight a separate vent line seems unecessary??? If so what size vent hole in the cap?
 

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