My '96 C280 has just developed the same intermittent problem. After searching the forums it appears that the fuel level sensors are the most likely culprit. However, when my fuel gauge "drops" to empty, the low fuel warning light does not come on. Does yours? With the needle on empty, shouldn't the low fuel light come on even if the information from the sensors is wrong? I'll see if the warning light still comes on normally when the fuel level is actually low (it does light up with the other panel lights when starting the engine) and the fuel gauge is acting normally. I would also appreciate info on replacing the sensors. Thanks