Fuel Gauge Problem
 

I bought a 02 C320 a while back and started having problems with the fuel gauge not working. The needle sits on empty and the low fuel light wasn't coming on at first. I reset the computer and checked all the fuses and the low fuel light is now staying on causing the reserve tank malfunction, but the needle still sits on empty with a almost full tank of gas. Any suggestions besides fuses and resetting the ECU?

That system uses 4 computers to monitor the fuel tank quanity & also 2 sending units.

Diagnosis is done thru a MB scanner...NOT ODB2.

Ok, I'll try to make it to the shop soon. I also have a issue with my ESP. Even if I turn it off it will eventually give me an ESP malfunction while driving and ask me to visit the shop, but this doesn't bother me like the fuel gauge problem.