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If I follow these last messages, and excess fuel is Y'ed and goes back both to the main and aux tanks, then the 6 gal always left in the aux makes sense: it's excess fuel that was put there AFTER you switched back to the mains. The problem now is this: what happens when you take off with full fuel tanks? Is the excess arriving at the aux tanks blown overboard? That can't be, so there must be more than meets the eye here.
Ernie
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