...it ever produce fruit? this tree is potted as I am in the pocono mountains and can't plant it outside.

Most fruit trees require two trees to be near each other in order to pollenate and produce fruit. I would say that you are short one tree.

That's very impressive. Congratulations on producing a tree like that.

It might, I've heard the seeds sometimes can take 15 years to flower. It's just got to make the changes, to change it's hormones to produce flowers.

I think they are self fertilizing, but you may want to transfer the pollen from the stamens with a paint brush.

I believe most grapefruit is grown from clones (cuttings).

NO!!

Grapefruit needs heat for sweet-tart fruit: best in the desert where fruit ripens in 9 months (can take a year or longer where there is less heat). It will NEVER get warm enough in your indoor location!!

Good Luck!!