^^^do that and see if it changes the issue. Or if you can get a vented cap for that tank. Or drill a few small holes in the one you have.
A pricey way to do it is this:
https://www.iimuch.com/collections/f...erential-vents
Guys swear by these, no gas smells in their garages that an open vent often allows.
On the return, when the early EFI swap guys were on the power tour in the early 2000s, many had hot fuel issues due to returns from the engine. it was causing fuel pump cavitation. that is when the corvette fuel filter with the regulator came into vogue. Note Chevy doesn't return hot fuel back to the tank.
OEs do things for reasons.