rhp454

When I come out in the garage the next day for the first time I have a gas fume smell. It seems to only be there if the tank is half full or more. I just replace the gas tank with a new one. Ran the vent lines from the back to the loop pipe that goes into the trunk and back down and rebuilt the carb too. I just ordered a new front to back gas line from in line tube and will try that. There is no visible gas leak any where I can see. Suggestions?