Fuel tank over full?

Yes fuel expands when hot.
And it will MAY damage paint if it stays wet below the fill.
I know.
But unless the tank is under some kind of excessive pressure I don't think a grommet should leak.
I've only ever had one do that.
B body with a repo neck that didn't fit right the first install .
It was under stress and I had to relive the body to make it fit without being under interference and cocked.