I do not remember how to select Center tank so that it is used before auxilliary tanks in FS9...?
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I do not remember how to select Center tank so that it is used before auxilliary tanks in FS9...?
I'm not sure on the 737, but try turning off the boost pumps for the wing tanks and close the valves after making sure the center tank is flowing.
In my setup with PM-systems it draw fuel only from center tank until I switch off fwd fuel pumps. Then the fuel from wing tanks will be used:)
Do you have PM-systems? If so, check that the switches are wired the right way. :)