I think it is around 18". I know that is a long line but never had a second of pressure of fuel flow problem. I also use a remote fueler which fueling and un-fueling is a snap. Knock on wood, never had a single dead stick or even a sputter with the nose up. At our last fun fly we had a larger than normal crowed. I flew the Patriot around with some low high speed passes with the wing Whistles doing their thing.[>:] I was feeling froggie and went almost full on flaps. she came in very very slow with the nose up. She touched down like a real jet (nose up)[X(]. I pulled her into the pitts and she was still running smooth. The engine was not lean, rich, pressure lost, just running as smooth as when I first cranked her. The fuel system me and my friend did on this patriot works very well. I promise
