if you must have a cowled airplane one of the most impotant components you can have is a fueling valve great planes has one for $11.99 from tower hobbies. i have scetched a little diagram of how to intsall you can put it eather on the cowl or on the front of fuse eather works fine i have used one several time.as far as fuel going to the carb with the fueling valve when you insert your fueling prob provided with the valve it cutts flow to carb and only goes to tank.the part number is GPMQ4160. just my 2 cents i have been in modles for over ten years now i am building a p-51 mustang right now be off the building board soon. thanks.