i have a superlong fueline and a short one stashed on thee bike.
normally i have the long one on (my petcock is rigged so it only works on the off position matches the reverse on/off switch) it winds around the carb and cdi box so that its topmost loop is at the level the tank is 1/4 full.
there will be an air bubble on top if it goes below that.. it also collects particulates the filter misses in the bottom . if i run out, i have no reserve function. but if i need to. i switch to the small line and i can go another 5 miles.