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Fuel/exhaust smell in car

Heating and Ventilation

Vehicle Information: Model: C4; Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 3.6; Total Mileage: 42000;

My car developed a fuel smell in my trunk. I took it to the dealer only to have them tell me that they could not detect a leak anywhere in the car. It seemed to get worse over time and finally after extensive research on websites including this one I found that Porsche had updated the fuel filler neck not once but mutiple times. I purchased the most recent updated part and had the dealer install it. Along with the new part installed they steam cleaned the carpet to try to remove the smell of gas. It didn't help. I drive the car infrequently and when I drove it recently it not only had a smell of gas but I could smell exhaust in the car. Needless to say I took it back to the dealer and they are telling me again that they cant find anything. The service writer says he can smell it, but the mechanic says he cant detect anything. This is becoming very frustrating and somewhat expensive. I'm running out of options. Any thoughts? Do you think it's possible the charcoal filter is not working properly? My car is very well maintained and has low miles. I thought for sure that they would tell me the heat exchanger or piping is bad. Nothing. Please help!

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