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aux fuel burn
Somewhere I read or heard about the fuel return from the engine driven pump returned fuel to the respective main whether using main or aux fuel. So far the only picture I found showing that is from an O2 manuel.
I plan aux fuel to use for one hour, and get itchey after 50 minutes to return to mains, but have ran the auxes dry and switch back to mains as soon as I see a fuel flow twitch. This also depends on the power setting you are using. I usually burn 8-9 gph per eng. My longest bladder test has been 5+50.
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