Roll-over protected re-circulation nipple

The present invention relates to a tank fuel system, comprising a filler neck extending from a filler opening towards a fuel tank and a recirculation line, extending between the filler neck and a canister, the recirculation line being connected to the filler neck by means of a nipple which allows vapour recirculation from the filler neck to the recirculation line during refilling, wherein the nipple comprises a nipple line the first end whereof is connected to the recirculation line, which nipple line extends in the filler neck from the connection with the recirculation line, in a direction away from the filler opening.