206 gti smells a lot of gasoline help inside

My friends have a smell like fuel smell or exhaust gas that cannot be solved for a long time and it makes it very uncomfortable. But still it continues the same way. The smell ... The master couldn't find the reason. Does anyone have any information about this? There is such a thing about it.

there is a leak, the car is quite old, so it is normal, so in this way, if you bought the sadija or the original, if you bought the side industry, the fire will come out or the original 420 tl side industry is 120 TL quality