fuel used from tank 1 and 4 747-400

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Can anybody tell me how to stop the plane using tank 1 and 4 fuel when I still have more fuel in tanks 2 and 3? Also when using center tank fuel it starts using 1 and 4 fuel.Thanks,Marco Koolstra

[Qavion 19]

"Can anybody tell me how to stop the plane using tank 1 and 4 fuel when I still have more fuel in tanks 2 and 3? Also when using center tank fuel it starts using 1 and 4 fuel."Marco... I'm probably trying to teach granny how to suck eggs here, but...Sounds like you haven't got all your pumps on or the crossfeeds aren't open.Also... Note that when certain tank quantities are low, the fuel pump output pressure may be lower, allowing the check valves on some of the other tanks pumps to open prematurely (I believe this is modelled in PMDG).Cheers.Q>

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Never mind, stupid mistake. Please delete this question. Thanks anyway,Marco