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Factory Five Roadster Fuel System Install O Ring Seal

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The fuel-level sending unit is retained just like one from a classic Mustang or other Ford, with a square-cut O-ring seal and a lock ring. Again, a small amount of assembly grease here will hold the O-ring in place while seating the sending unit. We always recommend a brass punch or a block of wood for loosening or tightening the lock ring on a fuel tank to prevent sparks, but since this is a brand-new tank with no fuel in it, a standard punch will work fine.
Factory Five Roadster Build Part 8 - EFI Fuel System

 The fuel-level sending unit is retained just like one from a classic Mustang or other Ford, with a square-cut O-ring seal and a lock ring. Again, a small amount of assembly grease here will hold the O-ring in place while seating the sending unit. We always recommend a brass punch or a block of wood for loosening or tightening the lock ring on a fuel tank to prevent sparks, but since this is a brand-new tank with no fuel in it, a standard punch will work fine.  View Related Article