Water Level Sensor
The water level sensor is attached to the bottom of the fuel conditioner replaceable element. The sensor is exposed to the fuel and operates when it comes senses water inside the filter. If water level is too high, a water-in-fuel light on the instrument panel will come on until the water is drained.
NOTE:
When the water-in-fuel light comes "ON", the fuel conditioner should be drained as soon as possible to prevent damage to the injector pump.