My Fiat Uno Petrol Tank makes a sudden inrush of air noise, when I
> open the Fuel Filler cap. I have heard of cases on other makes of car,
> where the petrol tank vent gets blocked, and the petrol tank is
> basically sucked flat by the petrol pump sucking all the air out. I
> checked the pipe that runs parallel with the filler pipe, but it seems
> to just open out into the inside part of the filler cap, and no vent
> to the outside world, is this correct?, is this behaviour normal for a > Uno? TIA
>
> 999c Fire Uno 45 1991
I think it is normal, my "98 Punto does the same thing, at least for the Punto it is normal (the man in the garage told me recently).