It's not a matter of refueling or not. It's a matter that, unless you can make gravity do the work for you, like inside of a star, fusion reactors tend to consume far more energy than they generate, because they need insanely powerful magnetic fields to contain the plasma and said electromagnets have to be energized and cooled using external fonts of power.

Even if the dip was as low as 1%, which it's not, it would still make it impractical. You would have to reverse entropy, which is impossible as [@Raineh Daze] said, to be able to make it work.