I dunno, up here in the "great white north" these fuel tanks rust pretty badly. Most get to the point where they are not repairable. Most all cars nearing 20 years old up here, that are still on the road, are on their 2nd plus gas tank.
I would look at patching a rusty tank only as a complete last resort. Perhaps you can source one from down south somewhere which might be in better condition?
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