After setting up a keybind and making sure it was not conflicting w another. It didn’t work…BUT.
In this case I used ALT+R. It did not respond to ALT+R but it DID respond to R+ALT and topped up my fuel.
So not really sure what is going on with keybinding.
Edit: AT this spawn location I am able to request a fuel truck. It arrives but I get no POP UP to refuel. It does nothing.