One problem related to tank assembly has been reported for the 2009 Mercedes Benz E550. The most recently reported issues are listed below.
Please reference NHTSA action# pe12001. After filling the car with gasoline, there is a very strong odor of gasoline. The smell of gasoline goes away after using about a 1/4 of the tank. I am aware that this is a widespread issue with e class (w211) vehicles and Mercedes Benz has been denying any responsibility. I have not taken the car to the dealer yet and would be more than happy to allow the NHTSA to inspect my vehicle.