Hi,
on both fuel tanks on my 401´s was corrosion (al versus fe...). A lot of very small holes.
Repair was very easy to do: cleaning al and using Devcon Aluminium Putty (very expensive, but great quality!).
Between al-tank and fe-staps I have put a rubber-seal (no contact between fe and al!).
No problems any more!
German TÜV (your MOT) agreed in this method!
No costs beside Devcon Aluminium Putty. And some dirty hands...
Klaus
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