I was having the same issue with the Beaver, but now I know to cycle on things like Ferry flights, all good. Don’t need any fancy third party bindings if you have concerns about fuel, just go into the controls and bind something to add fuel.
Did run into one nightmare in a Pipistrel ferry, about midflight the sim gave me a generator fault, battery lasted a while, but then a while later all the electronics shutdown … ok, fine. Got to the destination and landed, parked up, but the mission would not complete … why? Because the dumb mission scripting required me to make the landing radio call, which I could not make because all the electronics were dead 