RCGF 30CC-Twin Operator's Manual page 8

It's a good idea to add an extension to the vent line as shown, that goes up and to the
rear of the tank. This helps to avoid draining fuel from the tank when the model is pointed
down.
4. Install the throttle servo at least 12" [305mm] away from the engine. Make sure that
you get the carburetor's full range of rotation with your servo travel. Be sure to use a non-
metallic linkage.
5. Install the choke servo (optional) at least 12" [305mm] away from the engine. Be sure
to use a non-metallic linkage. A high torque metal gear servo is recommended to operate
the throttle.