What all does the fuel tank vent consist of on a 68 barracuda fastback? I see a hose running off of the filler neck, does that just go into the frame rail somewhere?

The car is fuel injected and I have had some fuel heating issues. I have never touched the vent on the car in the 22 years I have owned it. So when I got home with hot fuel and a screaming fuel pump I popped the gas cap and it had a lot of pressure in it, way more than i would have ever thought. So that has me thinking I need to address a vent situation. It has never seemed to have issues of pulling a vacuum on the tank but I was surprised to hear and feel the volume of pressure come out when I popped the cap. Thoughts?

Stock fuel tank, baffled sump welded in for EFI, OEM line plugged at sender, and fuel is returned in the spare tire area of the tank.(took out spare tire well)