I highly recommend one of 2 methods for minimal problems.

1. Use a 3rd line system. What this involves is havining 2 clunks in the tank. One line with a clunk goes to the carb, the other line with the clunk goes to a fuel dot or other means of plugging the line, yet still be able to access it. DuBro "Fuel It" is an excellent setup and is complete. The "fuel dots" are just the plug for the fuel fill line and the retainer to hold the plug. You have to supply the additional tube for the tank, fuel line and clunk for the tank. The typical installation for the fuel dot retainer is to drill a (usually) 1/2" hole in which the retainer is fastened. The plug part is either a press fit or screws in with your fingernail.

2. Use a 2 line system, but have the line going to the carb come outside the plane/cowl. This line then has a short piece of copper/brass tube slid in one end. The other end has the fuel line that goes to the carb. To refuel, you disconnect the carb end of the fuel line from the copper/brass tube and put your fuel fill line onto the tube and fill/remove your fuel. There is a commercial system out there for this, but I don't know the supplier/manufacturer.

I use the DuBro Fuel It system on my planes. I have not had any problems with it and I like the idea that I can locate (conceal) the fuel fill/removal where I want. With the DuBro Fuel It or a fuel dot, make sure the throttle is closed when refueling (prevents flooding the engine) and watch the muffler. When fuel comes out of the muffler, the tank is full. With the 2 line system just watch the muffler.

Hope this answers your question.