I took another look at the engine manual and see that the third line is indeed capped. I didn't notice that before. Installing a third line with a second filter/clunk for fueling is a good idea. Thanks.
ORIGINAL: Dano101
Roadtrip, I used three lines. One for the vent / pressure to the pitts muffler, and the other two for fuel with two clunks. The two clunks are set up for one to the carb and the other for fueling and de-fueling. Hope this helps.
Dano