Extreme Gas Smell

I have a 1992 Honda Accord EX Automatic.

I have an extreme gas smell, that seems to come in through the A/C. This only occurs when the outdoor temp is 100 or above. I live in Arizona. I have had the fuel lines replaced, the charcoal cannister, the filler neck, the gas cap, the cannister solenoid, the fuel pump, the fuel filter, the pressure relief valves, and 3 different Honda dealers cannot figure it out. I have called American Honda, in the USA as well as Japan. The shops I have talked to say that it cannot be repaired. In the winter it is perfect,

This gas smell is not a mild smell, it is huge. Can anyone offer any advice? I even had a smoke test done, showing no leaks. Thank you, Mike