If you're using TRS06, I believe that all three of the built-in SD70 units would have re-fueling capabilities. They come from World of Trainz, and all of Phil's other engines are equipped with this setup.
Of course, I don't have TRS06 installed at the moment, so I could be wrong, as I haven't used those units in quite a while. It would be a good place to start though.
Patrick