If God is perfect and his creation is perfect, why should he have to refuel anything?
That's a good thought.
Some immediate thoughts come to my mind (not saying they are right):
How do we really know that there isn't already something different about the sun than all the other stars in the solar system? I'd be interested if this can be disproven.
How do we know that angles don't have the assignment to prevent the star from dying. I know this is out in left field but according to the bible we will never fully understand the creation of Jehovah.
Also, isn't most of what we know about a star's life-cycle from what we observe about others? How many years into the past have those events been? How sure are we that the "time-machine" of space observation is how things are currently happening now? Could there have been other physical laws in place before jehovah was done with creation? I know this is all specultive. I'm just saying we don't know everything.