The Saito 100 has a different fueling system. It doesn't have a built-in regulator, so you cannot use T's to fuel and defuel unless you clamp the line to the carb shut. The fuel line arrangement for the Saito 100 is much easier: you have one line from the tank to the carb and another line from the tank to the pressure fitting on the muffler. On a non-pumped engine such as this one, some people use quick fueling valves to fuel and defuel, but I never had good luck with those, so I always use a third line to the tank with its own clunk for fueling and draining. The line to the carb doesn't need to be clamped shut if you use the third line to fill the tank.