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Message: <blockquote data-quote="AlanT" data-source="post: 499844" data-attributes="member: 30185"><p>Yes, LDUBS, I've converted my gas cans to vented to avoid spills.  Ridiculous.  I believe you are correct that I will still need a vented tank because I haven't found documentation that states a demand fuel valve will also allow air into the tank.  It seems to me the only purpose of a demand fuel valve is to prevent a siphon effect caused by a pressurized tank resulting in a large fuel spill in or outside the boat.  I'd like to know the statistics on that.  I'm pursuing the vented cap, but doesn't seem like the demand valve is needed with a vented tank.  I dunno.  This stuff makes no sense.  The EPA police will need to come get me.</p></blockquote><p></p>