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Old 25th February 2008 | 12:38
  #402 (permalink)  
bsieker
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Joined: Jul 2007
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From: Germany
snanceki,

The scavenge pumps have float-operated shutoff valves, to keep them from pumping (a) out of a full centre tank and (b) into a full wing tank.

The boost pumps have no such valve.
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