One problem related to tank mounting has been reported for the 2002 Mercedes Benz C230. The most recently reported issues are listed below.
The car stalled on me twice. One time on the highway going 65 m/h. The engine completely shut off and came back on. The second time on a street road going 25m/h. The dealership checked it both times and they said the computer shows no malfunctions and they can't figure out the cause. Horrible experience.