Tank Filler Pipe And Cap problems of the 2007 Mercedes Benz E350

Excessive gas smell inside and outside of vehicle. After tightening the gas cap and trying to figure out what the problem was, I contacted the main new jersey office Jan 24 to report that I was afraid to drive the car any longer. That day, the car was towed to the local Mercedes Benz; I was initially informed that the smell was due to a leaking gas tank. However the leak was coming from the fuel filter/seal/cover ring for which I was charged $570. 70 to replace. At that time, mileage was 128,318.