The fuel tank on my plane has three lines. One to the carb, one to the muffler, and one to fill. The tank is completely hidden from view. My question is, how do you know when the tank if full of fuel, other than waiting to see it coming out of the muffler! This obviously floods the engine every time. Is there a better way? By the way, the lines are hidden behind a cowling, so it's not possible to easily disconnect the line to the muffler.