Leaking gas tank filler tubes ?

GTGrinly said

Kind of makes sense that it could happen, but your gas cap gasket is supposed to prevent this I would think. What is the mod, a baffle of some sort?

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I believe it is.

Even with a good gasket, the gas comes out,
onto the paint. :(

I bet even a gas theft spring would help,
but I haven't seen one of those in 25 years.