For what its worth,there are more ways to get uninterrupted fuel flow from a stock tank without welding on a sump. I used an in-tank pump that feeds a remote mounted surge tank to feed my EFI'd motor. Simple plumbing including adding an upsized return line provides me with airless continuous fuel flow even when the tank is down to the last gallon or two.

Modified a factor style fuel sending unit, added a narrow piece of Holley Hydromat to it (not pictured) and bolted in a surge tank. Easy and much more effective than using just a sumped tank.