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Looking at the pictures above, it looks like the bottom of the filler "well" is alloy already?
I wonder if it's possible to cut that out and clean it up well enough to weld to the ali inner tank?
It would then need the plastic outer sealing back down to it to prevent fuel leaks running down between the inner and outer and the cap would fit in the normal way.
I think the pump flange is metal too? so the same would apply.
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