A140 has gasoline smell

Hi all,
Since a month my A140 has a weird problem. When I drive for about 10km or so and I stop driving, a gasoline smell get's into the car. It disappears when I drive further and after about
40km it is all gone. Sometimes it occurs when the engine is cold, sometimes when it's warm. And it doesn't appear always!
My garage mechanics have searched it extensively and don't have a clue about what can be wrong. They investigated all gasoline lines, they looked at the injector, ... nothing found.
Me and my dad searched the engine for leaks with a meter, but didn't find anything either.
So it's a big mystery where the smell comes from. It is certainly a pure gasoline smell, not hot oil or exhaust gasses.
Anybody an idea?
Car: Mercedes A 140 (1998) One of the first on the market, so not quite 'mainstream constructed' (even my garage holder finds things he has never seen in other A classes).
Regards,
--
Toni Van Remortel
http://www.nokelu.be
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Its a well known fault on "A Class" cars the petrol line from the injector rail goes porous it's under the air box assembly. If I remember correctly it's normally the fuel return pipe to the tank.
John.

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