Technical Fuel Leak when filling tank right to top?

[northcave]

Hi all. I have a 2009 Petrol Doblo. When I fill it, sometimes just as it gets full, fuel leaks onto the forecourt. I can't quite tell where its coming from... perhaps a breather pipe or overflow pipe. Maybe this is a difficult question to help with as I can't for sure determine exactly where it is coming out.

Thanks