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Ernest,
One thing that you might want to consider ref the "jet" pump is the effect
that high altitude might have on the operation of the pump. I have not
looked into it but wonder whether the lesser air density would affect the
amount of pressure differential produced. Whether there might be a point
where the jet just ceases to pump.
Ed A
Looking over the diagram in the PDF that Ed sent. The jet pump works
all the time, constantly pumping fuel from the bottom of B into A, where
the main pump can pick it up. An important element to this is that
there is a large return path for fuel to go from A to B. If the tank is
half full or more, all the fuel moved by the jet pump just flows back
over.
In the airplane transfer, you'd want two lines. One from the bottom of
B to the jet pump. Another from the mid level of A to the top of B.
The lines need to stay below the tanks. At no point will the the sides
ever be more than 1/2 a tank different. Consider:
A is full, B is empty
Fuel will flow from A to B via the return line, until A is half empty.
B is full, A is empty
Fuel will flow to A via the jet pump, until B is empty.
A and B are both half full
Fuel will flow to A. If A gets more than half full, fuel will flow
back to B.
A and B are both full, and you park sideways on a hill.
Fuel will flow to the ground until the high tank is empty. Doh!!
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