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Message: <blockquote data-quote="LDUBS" data-source="post: 505710" data-attributes="member: 21536">I thought the new EPA tanks allow pressure build up to prevent venting.  If I recall, they are supposed to vent after reaching 5 psi (why plastic tanks expand like a balloon).  On my previous Merc, I installed a fuel demand valve in the fuel line.   The idea was to prevent gaso from being forced through the fuel hose because of the pressure build up before the tank would vent.  If the tank won't vent when the motor is running it would create a vacuum.   I forgot to open the vent on the plastic tank once.  It started to "deflate" (don't know how else to describe it).  Either way, I hope you find the issue.</blockquote>