Welcome to the forum.
With a liner as old as yours I'd bet you destroyed it by draining. You should have just removed all the crap you can then deal with the water issues. The vacuum is used before and during the initial fill. It sucks the liner against the walls until there is enough water to keep it there. Older liners lose flexibility and that's why I think you have a problem. However...you have nothing to lose by trying to refill. If the thing isn't ripped then give it a try. Refill slowly and see what happens.
Good Luck,
Al
Bookmarks