Fuel Operated Auxiliary Heater, Checking [2017-2018, B4204T11 | 2016, B5254T12]: Adjustment

Ensure that the fuel quantity is approx. 10-15 liters, that is just above the point where the low fuel level indicator lamp goes out.

Adjust or drain the tank as necessary, according to:

Perform fuel tank draining, refer to: FUEL TANK DRAINING