Several years ago I had problems with my fuel level sensors on both my 1995 C280 and 2000 ML320. This started happening after I had started using BP gasoline. I am not sure what additives are used in this product versus other fuels but I noticed a direct correlation. Since it happened in both of my Benz's after switching, I switched back to using Mobil/Exxon products and after several tanks of gas the fuel level sensors went back to operating normally.

Some might say it was moisture in the tank of the BP station I was using but that was not the case since my wife was filling her vehicle at one BP station and I was using a different station.

It has been several years now and I have not had another fuel level sensor problem and the fuel level sensors have not been replaced. All I know is that I stay away from purchasing the BP product due to problems I have noted.