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Message: <blockquote data-quote="LDUBS" data-source="post: 498567" data-attributes="member: 21536">Looks to me like the vent is built into the Perko fill cap.  If you can access under, there should be two hoses from the tank to the fill cap.  One large diameter for the fill, and one smallerl diameter for the vent.  Problem could be a blocked or kinked vent line.  Or an obstruction in the fill hose.   Additionally, at some point (I don't know the year) EPA required some kind of device in the vent line to prevent vapor release.  I don't know what it is called or how exactly it works.  Seems reasonable if that device malfunctioned, it would be an issue.   This is really conjecture on my part.  Hopefully someone who has actually dealt with this will chime in.</blockquote>