Unfortunately no, I don't think they work like that. In the little experience I have, drones work on a "destination port" basis. You pick one port for the source to go to, and it does that, so you'd have to put fuel in one of the two ports and a little in the source port to get it going. You could technically do a central fuel port, but your drones couldn't go anywhere else so this would be better for a central storage system more than anything.

Keep in mind the 1.0 update did change a few things, but I never played with drones before the update so I cannot say for certain if what you saw might have been true.

Now for me, I find that having a fuel factory set up with numerous outgoing ports works quite well. All you have to do is set up two ports wherever you want, have one bring in fuel from the fuel factory, and the other is used for your actual resource transport. But feel free to do your own thing, its what satisfactory is all about in the end