Tank Filler Pipe And Cap problems of the 2003 Mercedes Benz E55

I came out to my car the morning after filling up the tank fully and smelled a strong odor of gasoline inside the car. I drove it to the dealer and it turns out the fuel filter/fuel sending units had cracked and were leaking fuel. There is a sending unit on either side of the fuel tank under the rear passenger seats, and the fuel was leaking out the tops of these sending units into the cabin of the vehicle. Because I caught it early, the gasoline had only pooled on the top of the fuel sending unit and not spilled into the seats and footwells. The dealer diagnosed the issue as cracked sending units and said both needed to be replaced. I did some research online and found that there had been a voluntary recall on my car in 2008 by mercedes-benz for this exact issue. The recall had been performed but clearly had not fixed the issue, as these parts failed again less than 2 years later. This complaint is the same as another complaint already filed on this vehicle model and year. The dealer replaced both sending units as a repair to the issue. Updated 05/02/11.