You're off to a great start, Andrzej
I used to top off until I saw the foam, but then noticed that this usually ends in 1-3 liters of fuel under the car - not good for overall consumption IMHO. I suspect it is some kind of overflow or air vent, or maybe a small hole or crack, but never found it when inspecting. A shame, because that extra fuel after the first click could extend a tank by as much as 100km. Hopefully you won't these problems, so enjoy the longer tanks
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread