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Mitch suggests that the mechanical pump will eventually draw fuel from an auxiliary tank after you've run the lines dry, with air bubbles in them. It's the first time I've heard of it. I'm under the impression that the mechanical pump will not draw fuel, which is why the POH makes it clear that you should draw from the auxiliaries in the middle of your cruise (not at the start, when the mains are full, and not at the end, when the mains are dry). Even if Mitch is right, who knows how long it takes. I think the safest approach is just to assume that it won't work.
Ernie
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