RE: 3 line tanks - 3rd line bend tubing or use tubing with clunk?
ditch the brass!!!
i use 3 lines, but i don't bend the 2nd, one clunk, on fill line thats either moulded at the top or just squirts inside from somewhere. 3rd is the exhaust which is bent up. to empty i use the engine line, but...!!!!!
i love that idea of a bent tube down ( no clunk ) got a couple of planes that could do with that.