I am ready to get this engine off of the ground this weekend when I solve this issue. I have got everything set up in the cowl (so I thought). I tried fueling up my airplane tonight and am getting fuel dripping from the carb at about a 1/2 full tank. what setup are you using in you're in cowl engine? I have the saito 100 engine, have all lines running correctly, carb is closed all the way when fueling, I installed the Hanager 9 fueling app. ( threaded tube with plug ) along with a tee inline to the carb. I know they sell a switchable valve for this but I am asking what else is out there or have I set this cowl rigging up incorrectly? or is that what I have to get without having to find the carb line and pinch it off.....Thanks Jeff.