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Let us assume the excess does go back to the aux tanks, why is it not useable? The POH says 18 gallons of the 19 in the aux tanks is useable.
From the diagram, you cannot tell if excess go to aux or main tanks.
If I recall, when this occured, I had switched from the aux to main after one hour. Later in the flight, My partner said switch back to aux and use the other fuel remaining in the aux. Shortly after I switched, that is when the fuel ran out. So, in theory, if I had use one hour of aux, and the excess went back to the mains back to the auxs, it would appear there should have been enough fuel to fly a half hour longer on the auxs.
This is a very interesting issue. I really would like to get the answer to the puzzle. I would like know what is going on when I am using the aux tanks.
I do really appreciate all of you offering your thoughts. Hopefully, we will all be able to come to a common conclusion.
Let me know anything else you can think of.
John
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