My mini doesnt have an interior at the moment so I can hear all the noise and smell al the smells as there no carpets, seats, etc. to block any of it. I only hd 1/4 tank in there yesterday and not a whiff of petrol. I put £20 in which filled the tank up to the neck and the petrol guage was passed the last marker

I've checked the neck of the tank, and the petrol outlet pipe (brand new) and their not leaking. I've attached the rest of the brand new hose onto the vent at the top and the other end out the hole beside the engine feeding one but its still a bit stinky inside!
Is this because I have no interior? Filled it too much? Or is everyones this way?