Thanks for Reply. The Issue was the center tank pumps. 
I use Honeycomb yoke and Bravo Throttle Quadrant.
I turned off all the Keys, which I don’t need. New Config only for PMDG 737.
Now is the center tank Pumps on.
Thanks for Reply. The Issue was the center tank pumps.
I use Honeycomb yoke and Bravo Throttle Quadrant.
I turned off all the Keys, which I don’t need. New Config only for PMDG 737.
Now is the center tank Pumps on.