Two problems related to other fuel system tank mounting have been reported for the 2005 Mercedes Benz E320. The most recently reported issues are listed below.
Began noticing gasoline smell in garage. Traced smell to the car. The smell has now intensified that I can smell fuel as soon as I exit the vehicle. The smell is now prevalent regardless of the amount of gas in the tank! it smells really strong in the driver side rear wheel well. I can no longer park the car in my garage for fear of fire. The smell is now becoming noticeable in the cabin as well. My understanding is NHTSA is aware of the problem and Mercedes Benz will not acknowledge a design flaw. I suppose I or some other owner will have to go up in flames before anyone decides to do the right thing. How sad.
Our car was purchased off lease around November 2008. It had 47,000 miles on it when we purchased it. We noticed that when we filled the gas tank up the gas fumes were strong in the garage since the time we purchased the car. In March 2012 the check engine light came on while on a trip shortly after that gas tank was filled. I read the manual and stopped by an auto zone and they told me it was probably due to the gas cap being loose and the fuel tank loosing presure and they cleared the warning. The light has come on a few times since then and I have had it cleared twice at auto zone since I did not think there was a big problem and I was in between services. Within the last six months I have had it the mercecedes service department and they told me they did not know why the check engine light was on and that they did not have enough time to find out what was wrong. Yesterday, September 25, 2013, I went to a Mercedes Benz specialists, local mechanic that only works on mercedes and uses mercedes parts, for an annual oil change and checkup and asked him to check out the problem that the mercedes service department did not know what was wrong. He tested the fuel tank using a system to detect leaks and noted that the top of the fuel tank had a crack and I need to replace the fuel tank and it would cost $2,082. Over the past few years I just filled the tank to half or three fourths so it would not emit fumes, however, I filled it up for a trip last week and you could smell the fumes badly in the car. Our car has about 134000 miles on it now.