The printer loaded the inks
Please say you didn't use the 10 year old cartridges... that is one of the early all-pigment ink printers and I shudder to think what ten years would do to it.
The printer won't have had any ink in the lines at all when it was shipped. The pumps are designed to charge the lines and should be able to work through any air locks. I
think that printer uses peristaltic tubing pumps, but some of those old industrial Epsons had print heads that had the power to pull the ink through the front-loading cartridges to the heads. Ten years shouldn't be long enough for tubing to have dry rotted, but that depends on what they used in the tubing. Even a peristaltic pump won't pull anything through if there is even a small crack in the tubing.
Did it finish the initial charging process? How long did it take, and did you get any errors?
I don't have a repair manual handy for it, but I'd get one and check. That printer is 100% worth the effort even if you have to redo the tubing.