high friends.in the case of fuel tank design we have encountered a confusing problem.if sight tube reads the amount of fuel consumed in endurance event so there is just the fuel inside the filler pipe between lower and higher lines marked on sight tube on debate.so even with so a wide fller(let's say 50mm in diameter)we need at least a 60cm long filler ?!!!so wath about the rest of the tank?and realy what is the rest for?if anyone may give help I'll be so much greatefull.