Heavy gas smell

This is on a notchback, so I will go out and look at it tonight and see if there is a vent tube that runs next to the filler tube. I know the previous owner said they replaced the fuel tank. I also saw online where tanks are listed as having 2 vent lines, so I don't know where those would be or if he one not connected to anything. I've run into other strange things the previous owner did on this car, so nothing would surprise me at this point.