unusual fuel tank leak issue

[b1gw0mp66]

Hello! First time posting here. Have an issue i’ve never seen before and really can’t find much info anywhere about. Am finding that whenever i fill my ‘08 Yaris up to full, gas leaks out from under that red plastic ring where the filler neck attaches to the tank. Quite a lot gushes out, seemingly until the extra gas in the filler neck is emptied out. If I don’t fill it to full I don’t seem to have any leaks whatsoever. That red ring doesn’t seem to have any visible cracks but it does look somewhat warped at the bottom (know the pic isn’t too hi-res to demonstrate). In my research, this does not appear to be a part you can simply remove/replace, but may be mistaken. Seems to just be built into the gas tank. Realize the only solution may be to replace the whole gas tank, but just want to see if there’s any possible way to repair/seal/replace this. Any input is appreciated, thanks!!

Matthew