i have a similar problem on my sei, the smell of fuel on hot days makes me feel ill after a while, i can see petrol on the ground when the car is parked in the wet or on a hill, but i cant find a leak anywhere!!!!! it seems to be nearer the engine its leaking, but the tank seems to be where the vapours are worst, ive checked the tank and it seems the centre seam is just starting to get a bit rusty, but isnt leaking, the fuel lines are fine and theres no sign of any leaks round the engine, its puzzling me where its comming from, according to the fiat dealer who is utterly useless, there is no leak (despite photograpic proof of puddles and trails of fuel) and even better no petrol fumes in the cabin!! (with their cheif technician sitting in the car saying this as i could smell the fumes from 5 feet away!) apparently its all in my head that im getting gassed by petrol and the puddles of fuel and all the splashes and trails of fuel along my route are all my immagination, along with my shocking fuel economy (£10 of fuel gives me about 40 miles), so thanks anyway arnold clark fiat in dundee, if you could have you would have reffered me to a psychiatrist rather than a mechanic, unless i payed £500 to get it looked at all the fuel system replaced of course!
i swung by my local independant i normally use and they agree that theres a horrific smell of fuel, they will be looking over it tomorrow as a matter of urgency
not just better service but their hourly rates are a third of the price, and the quality of the work has always been top notch!, i've decided i will not be buying a fiat 500 from ac in dundee as i will not give them the custom now or ever.
sorry for hijacking the thread a bit there, this whole petrol topic that is getting on my nerves as nobody seems to know or isnt willing to say what my problem is on my sei, hopefully youve found your problem before you get idiots like my local fiat dealer involved mate
keep us informed of whether you've got it sorted