Here is a one that gets all our engineers going against our pilots.
We shut down the wing tank pumps and they want one on the left wing on to feed the APU. Reason being the apu pump is a DC pump and therefore not as powerful and tends to fail.
Correct me if I'm wrong but that pump only runs when there is insufficent pressure and due to the weight of the fuel in the wing I was always under the impression that it gravity feeds.
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Gravity always wins....