there is no reason that the tank would be bad. i wouldnt worry bout replacing it. on a ranger there are no lines that are built into the tank. its all on the sending unit that mounts from the top.
I had that problem with my 77. It was just no gas getting up to the pump. So I just unhooked the rubber hose from the pump and siphoned gas up the line to where I could make sure gas was atleast getting up to the front of the truck to the pump. Then I connected the rubber line back to the pump and every thing was fine. Primed the carb with a litte gas down it cranked right up. Good luck!