I am having a problem filling the fuel tank of my 1998 Mercedes ML320; The gas pump keeps cutting off before the tank is full. Could this be caused by either a defective fuel tank pressure sensor or vent valve? I understand the function of the vent valve but what is the purpose of the pressure sensor? Thanks

make sure the pump nosell dosen't touch any part of the interior of the gas tank. this happened w/ my 95 c220. took me a while to figure out wut happened. I believe that the sensor is on the pump, and not actually in the car itself.

The fuel pressure sensor I am referring to on the ML320 is attached to the filling tube neck just below the filler cap (US models only). The sensor in the pump nozzle keeps cutting the gas flow off and it takes numerous attempts to fill the tank. I have seen posts suggesting that a faulty vent valve, resulting in increased fuel tank pressure, might cause this problem. However, I wondered if the pressure sensor, which I believe is part of the evaporative emissions system, could be a factor?