Since you’ll never be sending fuel
to the engine
from the converted tank (only to bilge
tank, which supplies engine
& has a fuel
return), you won’t need a new fuel return line, and gravity should work.
If this tank is the same material as the other water
tank (likely?) that’s leaking at a welded seam, it’s probably not extra low carbon S/S (316L
). The reason low carbon S/S is used in fuel tanks
is to mitigate the problem of corrosion
in welded S/S (intergranular corrosion
of welds and/or stress relieving).