Other Fuel System Tank Mounting problems of the 2007 Mercedes Benz C230

When I fill up with gas, the car salon fills up with the gas smell. The problem should be in the fuel pump or so. The smell is persistent in the garage. While driving, I did not notice. When the amount of gas in the fuel tank decreases, the smell goes away. I removed the back seat and so the gas residue over the pump.

Balance shaft is bad mercedes wants $5833 to fix it now they have a class action lawsuit against them for that they should have to pay the whole amount to fix it as I looked for recall I found the problem for my gas tank that should have been recalled to if you fill the car up you can smell gas need help to fix this.