Thanks very much for taking the time and doing that,it gives me something to think about re cowling access.The problem right now is the cline regulators and rotoflow tank still hav'nt arrived so it's a frustrating wait.I can't finish the decathlon and test run the engine till they get here.With this fuel set up the tank will be back nearer the cg and mounted with the tank bottom inclined downwards at about 40 degrees because it's a bit cramped back near the servo tray.Do you think that not having the tank level will make any difference? cheers mate.