Jepp, it's broken.
Doing a Flight with max Fuel Capacity in all Tanks.
Starting the Engines with Main Only, then switching to Auto and watching the Fuel Indicators in Flight.
Tip Tanks are draining and Main is raising up.
Tip Tanks reaching the Level from the Outer Tanks and now both Systems are Draining. Main still raising up.
Tip and Outer Tanks running Dry and the Engines are out. Switching Auto Fuel System Off and Restarting the Engines didn't work because Main Tank is not used.
Next Test. Only Fuel in Main. Auto Fuel System Off, Outer and Tip Tanks with no Fuel.
Starting the Engines did work but after a Minute, they Shut Down. Main Tank is not used for Feeding the Engines, only the Wing Tanks, but the Wing Tanks still feed up the Main Tank over the Limit.
Next. Fuel in Main and Outer, but not in Tip. Auto Fuel System Off. Engines Running, feed from Outer, Main is not raising up.
Waiting until the Level is about 100 lbs in the Outer Tanks. Now adding Fuel to the Tips. Auto Fuel System still Off. Fuel Level in the Tips is now Draining but no Feeding to the Outer or the Main. Tip Tank is reaching the Level from the Outer Tank and now the Level off both Systems is draining again.
Filling up the Tip again and now Auto Fuel System to Auto: Main Tank is filled up very quick (was at 600 lbs) until its normal Full Level is reached, then the Filling Rate slows down but the Main is still feeding with Fuel. Tip is loosing Level at the same Rate (First quick than slow), Outer is not filled up. Not with Auto Fuel System ON or OFF. It looses Level when the Tip Tanks are reaching the same Level.