I second the fuel dot. It's the cleanest and easiest solution. However, if you do want to stay with a 2 line system and aren't overly hung up on looks there is an easy solution. Simply drill two small holes in your cowl. Have the line from the tank to the carb exit one hole and go back in to the other hole. Have a split in the fuel line that is joined with a small bit of brass tubing. This way you can just pull the line apart to fill the tank.

Ken