Two problems related to tank assembly have been reported for the 2003 Mercedes Benz C320. The most recently reported issues are listed below.
I purchase my 2003 mercedes from carmax in 2 years ago. It had 45,000 miles when I purchased it. From the time I purchase this car I had to replace the sunroof motor, replace the shocks, replace the truck lock, replace the fuel tank, and I had some transmission work done. My biggest problem is having to replace the low beam lights every 6 months. I suspect there is an electrical problem, but cannot completely prove it with the manufacturer. With 1 year, I had to replace the bulbs 3 times. I had to replace the front low beam bulbs and the brake lights. This is surprising since this car (under my ownership) has never been in an accident. I am so disappointed I purchased this car!.
The fuel gauge failed to function. It didn't register the correct gas level in the tank. The digital console light malfunctioned. It would either not illuminate when the vehicle was started or when illuminated it will suddenly go out. The vehicle hesitated upon acceleration when driven for long distances.