Leaking steel Fuel Tank

[petri oosthuizen]

Hi All
The old GS has a small leak on the RHS of her fuel tank, on the "seam".
I noticed it 2 days ago.
It was wet then, but completely dry since, and funny enough, the fuel level was almost empty when it was wet.
Anyway.
How to fix??
Thanks

 

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[petri oosthuizen]