ORIGINAL: bigbird007
This is also my first gas engine and after reading about Tygon fuel lines it seems I need fuel barbs. I understand you can solder one on before inserting the tube into the cap on the fuel tank but don't see how you could solder the other one without melting the tank stopper.
Another way to consider is soldering a small dab of solder on one end of the tubing, slide it through the stopper from the inside and then just slightly flare the other end with needle nose pliers or something similar.
If you are concerned about melting the stopper, this will work just as well.
Just remember to secure the Tygon onto the tubing with a small tie wrap after you assemble everything into place