Can't imagine any Toyota dealership handing over a gas tank without installing it. Liability concerns are what I believe would preclude that happening.
Just last week got the recall done on my 87 FJ60 at Kelly Toyota in Hamburg PA. No questions asked, they even ordered a new suction tube filter (that I had to pay for). It was a no sweat deal. I have no idea what brand hose material they used but it looks all good underneath.
Did someone...