[jcondo]

Thanks everyone for the info.
Upon talking to the P.O. and doing more digging around in the truck this after noon, I have found out that it did not come with a factory auxiliary tank.
P.O. and RPO codes confirmed this, he claims to have added an aftermarket fuel tank on the drivers side. He says that it never had an actual duel tank set up and that the added one just pumped over to the original tank on the passenger side.
So depending on what I find out with the passenger side tank I may just eliminate it and patch the hole when I get the rust repaired, or ill figure out a way to make it useable.