A small side project: Since two years, our Cheyenne is always half filled with fuel when we pull her out of the virtual hangar. So nearly never a need to watch on the fuel quantity gauge. No need for fuel management. No need for refueling. This is boring!
So I did first add a system that saves the fuel status and reloads it at the next flight. This will give the fuel quantity gauge a sense. But refueling with the menu does not increase the realism so much. Does it? Better is a gas station next to the simulator:
https://www.youtube.com/watch?v=sEURUQLn0hw
The power of the pump and the price per liter can be adjusted. The system must be switched on and the tank can be selected. The Cheyenne does only have two of them. Boring again, I know.
You can test the unit, reset the display of the fuel that has been pumped into the aircraft. If you hold the button for a few seconds, it will also reset the costs. There is another button that will display the overall costs. Holding it for about 30 seconds will erase the costs that have been accumulated over the years. This is just to clear the fuel I did pump during testing. 
The overfill lamp will warn you if the selected tank is nearly full.The system is already mounted onto the wall and a first traffic pattern with virtually pumped fuel was wonderful.
