Keep that brass tube for the third line bent up toward the top of the tank near the front, right next to the muffler tube. That way when you fill the tank and it spurts out the muffler tube, you can be sure it's full to the "brim". If the line is in the back, there may be a 1/2 oz less fuel in the system when it spurts out the muffler tube. Stub that third line off with a tight fitting socket head screw or anything else too big to fit in it very easily.

Let it dangle and go flying...stop worrying whether or not it will start again...it will.

jw