RE: 3 line tanks - 3rd line bend tubing or use tubing with clunk?
Funny, I use 2 clunks, with the filler-drain clunk 2/3rd of the way to the back of the tank and was wondering the exact opposite - I can never get all the fuel out and was thinking of changing it to having a brass tube bent a little over 90 degrees towards the front corner of the tank. I'd have it actually touching the bottom of the tank with a notch cut into the end.
I suppose the tank is always better drained on the other side of the fence.