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Fuel tank float switches are far from ideal.  The float is designed with
enough volumn to displace fuel equal to its weight plus some.  The problem
is that in a turn or in turbulance the float will weigh more and probably
sink.  This will cause transfers of fuel when the tank is already full,
false fuel low warnings and etc.

There are optical fluid level switches that are not affected by "G" loads
and cost only slightly more.  I used two such switches with excellent
results for my automatic fuel transfer and advisory system.

Jim Frantz
jim@angle-of-attack.com