A body Gas tank?

Look for "mini fuel tank sump" on eBay. They are about $25.00 "mtltek" is the name of the vendor. And yes I bought a new tank for mine. Had a buddy weld it. There is another pic in my build thread.
Ebay GT45 + 5.9 Magnum + E85 blow thru
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Apparently the sump can be treated so it doesn’t rust, but I’m not sure of the product or process.