RC-Av8tor, I would use the line set-up that is posted by mecam. Do not use the check valve in the vent line on gas engines. The vent inside the tank should be as close to the top and as far forward as possible. It also helps if the front of the tank is just a little higher than the back in level flight. The Walbro carb on you FPE will not allow gas to pass when the engine is not running so there is no need to pinch the line during fueling. Gas has a much higher evaporative pressure than glow fuel, its the wooosh you here when you open the tank in your car, some liquid venting is normal but it shouldn't be more than about a teaspoon a flight.