Other Fuel System Tank Filling/charging problems of the 2006 Mercedes Benz E500

After filling gas tank, whiled stopped, there is a strong odor of gasoline evident. The small seems to originate near the rear passenger side. Sometime it's detectable inside the car, but mostly it's readily apparent outside the vehicle. After driving the car for 10-30 miles, the smell goes away.

I have a 2006 E500 sedan. Just before the three year warranty expired, we notice a strong fuel smell in the car. We had a mercedes dealer, check it out and the serviceman said he found the problem with a seal on the fuel pump panel below the left rear seat. Said he had the problem fixed. This was the area of the problem but he didn't stop the leak. After the warranty expired we had the car serviced and the dealer found a bayonet fitting to a overflow cannister disconnected. The leak problem still persist and I have resorted to not filling the car up with gas. I have had to rip out the sound proofing blanket under the rear seat because of fuel odors. ( it got soaked. ) the seat foam got wet in the area just above the fuel access panel. Is there a seal (o-ring or otherwise in the fuel tank o cap in that access area) should I take the cap off and look for a burr on the tank? what torque value or how tight should this cap be screwed on the tank?.

Strong odor of fuel inside vehicle after filling the fuel tank at station. Smell went away after approximately 50 miles.

After filling the fuel tank last September I noticed a very strong gasoline smell in the cabin of the vehicle. This happened 2 more times before bringing the vehicle in to my mechanic. He explained that there was a leak at the top of the fuel tank.