Citroen fuel C3

Hello friends,
I require your wisdom to solve a problem with my Citroen C3 year 2011. It happens that days ago I filled the fuel tank and when leaving it full began to fall abundant benzine under the tank, but after a few minutes it began to decrease until it stopped leaving. But the interior of the vehicle was left with an unbearable smell of benzina, someone could tell me what it can be.
I await your opinions