Pete, you wrote in a previous post, "The goal is to always keep the main tank
full until the wings are empty". That seems reasonable. It is hard for me to
understand how the fuel computer knows when to open and close the wing tank
valves when there are only two level sensors in the main tank, high and low. It
would not be desirable to let the main tank fuel level go down to the low level
sensor before opening the wing tank valves.
Suppose the computer closes the wing tank valves when the main tank is full.
As fuel is used, the high level sensor tells the computer that the main tank is
no
longer full. The computer could then wait for a period of time, say 5 minutes,
before opening the wing tank valves again. That time delay period needs to be
short enough to keep the main tank relatively full. The time delay also needs
to
be long enough so as not to wear out the solenoid valves due to short cycling.
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Joe Gores
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