I have problems with my tucson car

I have problems with my Tucson someone can help me.
Every time I turn on the air conditioning of my car, a smell of gasoline enters when I have a full fuel tank in the car or in half it works well but when it reaches 30% of its capacity the problem begins and I have to turn off the air and come the ventolors so that the smell is scattered.
Thank you.

Hello Pablo, the only relationship that I see with the gasoline smell when it is under the deposit, is that there are more vapors, than when the air conditioning operates, the fans are activated and assuming that the carbon or canister filter of the purge of vapors of the tank (if it carries it in the front) or some of its hoses are broken and released to the atmosphere the vapors. Draged towards the entrance or filter of the habitaculus ... (It is just a conjecture), it may also be that the APORADOR Board is not stagnant, or simply have some leak in some gasoline sleeve ... Look at it to see. NO SMOKING!! (For now ..) Greetings !!