Paul,
     FWIW: To help narrow down your options:  I believe my Lancair ES has
the
     same EI fuel probes as yours, but mine are connected to a standard
     EI fuel
     gage.  I have no problems with wandering indications in flight.

     Composite wings do generate static charges in flight--especially in
     light
     rain.  I flew through a very light rain shower enroute to Oshkosh in
     2003.
     The electric trim position indicators went absolutely wild, flashing
all
     kinds of lights, and then went blank.  The trim motors still worked,
     and the
     EI fuel gage indications remained steady.

     Tom Parkes



Tom,
Are your gauges affected by the nav/com?

Mark


Not that I recall.  I hope to give an update on this before the end of
March.

Tom

Could the pressure increase inside the tank going up with speed
via the venting cause a capacitance variation thus a different DC reading.

It could be verified on the ground by increasing lightly the pressure in the
tank.
Or in flight taking a reading in slow flight and another one at cruising
speed.

Just guessing have no logical explanation for such a phenomena.

JP


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