I don't know my car is much different then yours. Every fuel tank has to have a vent line somewhere, mines underneath near the diff. The FSM should point out its location.

After making sure the hose is not kinked, I'd stick a wire up it and see if something is stuck. It may have a check valve or something that is failing, the gas cars are a bit different.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200