1998 Renault Espace Petrol smell inside renault espace when

Hi there. Can anyone help me or give some suggestions to the problem of petrol smell inside my renault espace 1998 model with windows closed and air con with engine on. When the engine is off with air con on, there is no smell.

Have it checked with 2 different renault service station but the problem is still there.

Could not check any leaks from the fuel pump or tank or petrol hose. The air con air intake valve in front and that near the breather valve at the back (the place where prtrol is pump in ) has been sealed.

Any suggestions is highly appreciated. Thank you in advance.