How do I replace the fuel level sensor on my 2006 ML350 on 2006 Mercedes-Benz ML350 4MATIC

Gas gauge show the car is empty at all times.

1 answer
I HAVE LOOKED IN TO THIS MATTER , BECAUSE MY FUEL SENSOR WENT OUT INSIDE THE TANK, THEY WANT 1000.00 TO FIX IT. THIS IS CRAZY.