The rear vent on the tank is broke that goes to vacuum canister. Any suggestions on how to obtain the part. It's discontinued thru dealer and aftermarket providers. I've called alot of salvage yards and nobody has one.

 

Is the break on the exterior if the fuel tank? If you still have the original pieces, you can try to JB Weld them together.
Option 2. Find someone who has a 3D printer and make a new similar
It looking connector