I would bet it is rusted up and frozen inside, which is why it won't bleed. I replaced mine on my 1997 Land Cruiser, it was a ball of rust and I had to saw it off, the gas tank blocks access to the bolt heads abd the bolts probably would have broken anyway.
There is always a big debate about this at IH8MUD, lots of guys are pretty cavalier about taking them off and running straight lines or maybe some kind of manually adjustable valve. I am on the side of, the Toyota engeineers probably know more about it than I do, and they think it's a good idea, so I'm not going to disable a major Toyota-designed safety feature on the truck. But lots of guys sneer at me on the forum.
The great news for you is, it's so accessible! Won't be hard at all to change.
Last edited by MMM; 10/28/20.
