not a particularily fun discovery when you are +3000 kms from home !

But I was lucky it’s just for the connection between the two lower tank halves, so I just closed the tap. This means that I now have a 15 liter tank instead of 19 liter – and only 20 km on reaerve. But it’s not a big issue, and I can always get hold of the remaining 4 liters by tilting the bike to the left.