Thanks fro replying!
Amazingly you are almost totally right!
1. I did notice the cruise control not working at all last saturday when I took a trip on expressway. I have never had a problem with CControl before. Your second point is also right! Couple of times during this trip I was able to engage cruise control for maybe 5 minutes and than it stoped. Point 3. Yes after the engine dies at the stop there is no problem starting the engine back again.
No, I did not change the fuel filter for while.
What is the technical name of the Hall Effect Sensor, so I can buy it from the mercedes dealer, or maybe the partsshop has it in stock? Where is the speedometer located? Tail light bulbs seems fine, but I will check it again tomorow. Thank for your help, if you have any other suggestions please let me know