Also if I have a feature card that gives me a VP when I gain a fuel, can a universal resource token count for that? Would I need to immediately convert it into fuel?
I'm not sure about this one, but I think you can gain the VP as you say.
I don't think this is correct. The description for Tank says that you gain a 1VP token "for every gained Fuel token." The universal resource token is not a Fuel token, even if it can be used as one.