greetings,
In fsx there is no way to start every flight with less fuel (like 1%) . Every time the flight is loaded the fuel is always 100%. Hence manually setting the fuel quantity to a less quantity becomes cumbersome.(if fuel is 100%, and if we select a percentage option for refilling in gsx menu , the truck does not refill as there is already 100% fuel) If it is possible for gsx when refueling automatically, make the fuel quantities to like 1% and then start refilling ,it would be easier.
Hope i conveyed my point.