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Bill,
I see the layout ...
The fuel lines from the wing tanks both flow to the crossflow valve. Think of
a line running along the cockpit floor connecting the left wing tank to the
right. Now put a valve right in the middle to allow or prevent the fuel in the
wings from flowing back and forth (by gravity if one fuel level is higher than
the other). Then, on either side of this "crossflow" valve insert a tee. Each
tee connects to it's respective Facet pump.
So the Facets are between their tees and the header, and the crossover is before the tees?
Okay, then the output from each Facet pump flows to the header tank via it's own dedicated line. Hence, the two lines to
the header.
Then you say...
With the crossflow valve open, gravity keeps fuel available to either pump
untill both tanks are completely empty.
What happens when one tank (not completely filled at the last stop) runs dry first?
It can't suck air until there's no
more fuel left. Even if it did (prolonged slip?).
But, wouldn't the wet fuel-pumping Facet draw the less-resistant air through the open crossover and into the pump and lose its prime?
Has anyhone tested this?
Terrence
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