The cap has nothing to do with it. You have a fuel breather line on the inside right of the tank and a water drain line on the left The water drain is exterior of the tank and passes threw the tank and out the bottom. Both lines meet at a y connection near the pivot point of the swing arm. What you are seeing is just fuel vapors that are condensing in the vent line and running out. Its perfectly normal. Just more pronounced when the bike is in the sun.
2012 Vegas Eight ball
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Last edited by Sponkey#1; 08-17-2014 at 10:23 AM.