How do fuel guages work?

From: (Ken E. Ward)
Organization: Apple Computer
Date:         08 Aug 95 02:14:39 
Followups:    1 2
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Or more to the point, could an airliner experience a failure in the fuel
lines, which resulted in the loss of fuel, combined with a failure in the
fuel guage (or whatever fuel-available monitoring system exists), such that
everything would appear normal until the engines quit due to fuel