Gas cap leak

[herbie]

First fill up on my new Brozz resulted in a wet tank from the gas cap leaking, next fill up I didn't put as much in and it was better. But I like to take long rides sometimes and I like plenty of gas so thought I would try something to see if it would help. I took an O ring out from my trusty ole harbor freight kit and found one that would fit over the locking mechanism and under the rubber seal like in the picture. I only filled it up once so far but it didn't leak at all, I don't know the long term effect of the O ring but I will see how long it lasts.