Posts: 186
Since: 10/5/2005
Region: Swansea, UK - now live in Staines
Status: offline
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Hi Bruno,
Not a silly question, a good one.
I have not noticed any noise from my car. I do know that there can sometimes be pressure build up do to the petrol warming up a little, perhaps after a run or when sitting in the sun. However a good filler cap should hold the pressure in unless its too much where it will release some.
However if it is happening often then maybe you need to replace it? Do get it checked as it can be dangerous, someone lighting a cigarete nearby and boom! 
Cheers
Gavin
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Gavin
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