I have a good used Chevy / GMC van gas tank for sale. Came off a 2000 GMC Savana 3500. It's a replacement tank that was only on the van for 2 or 3 years. It does have some surface rust on the outside but is still good & solid. No leaks.
I believe this is a Spectra Premium part number GM58A tank (or equivalent). It's listed as fitting 1996 through 2002 Chevrolet Express and GMC Savana 1500, 2500, and 3500 vans.
Price: $20 Available for local pickup in Sherman.
Trades: Will trade for good used Guide tractor lights like the example shown in the last photo.