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Rob, Et al.

My interpretation of the Pillar Point switches is the same as yours (http://www.ppavionics.com/).  However, the sensors sound terrific.  I built an automatic "keep the header full" system that uses a float switch to detect full and shut the pumps off, and the same switch and a timer (to eliminate turbulence induced low readings) to start both pumps.  This keeps the header tank between 8 and 9 gallons.  Building today, I would use two Pillar Point sensors putting one about 1.5 inches above the other, using the top one to shut the pumps off and the lower one to turn them on.  Of course, there would be manual override switches.

My Vision Microsystems fuel probes are very accurate.  When the wings indicate zero (0 to 1 gal), I am running on "Reserve" and looking to land.  If necessary, I will run the pumps until the header stops filling (a rare once-a-year occurrence) and I would like a better way to know when the pumps are running dry.  I placed my pumps in the stub wings and, during flight, I cannot hear the pitch change as the pumps run dry -- maybe someone with pumps under the seat and ANR headsets can hear them run dry.

Scott Krueger
N92EX

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