<<My solution was to get VM to burn a new chip for my unit that ignores
low fuel so that I am not constantly explaining to my passengers that
"Yes, we really do  have enough gas and that it is just a gauge problem".
I have learned to live with it and to make sure I don't try to use the
VM information within about 2-3 minutes  of a radio transmission.
Fortunately, I have not yet seen any fluctuation of the fuel totalizer
so I tend to rely on it quite a bit.

  Sorry I don't have solutions to offer.  I'm not sure there are any.
Good luck.

  Jim Scales>>

The gage is off for "a few minutes" after a transmission?  There is nothing
in the sensor circuitry that has a memory that long, but the display unit
could have software that averages the reading over a long period.  The
problem could be in the display.  Incidentally we (Kavlico Corporation)
build capacitive probes for oil and other level sensing requirements.  We
could easily adapt our technology to fuel level sensing and our sensors are
thoroughly hardened against EMI.  I wonder if there is any interest in such
a thing.  One thing for sure - they probably couldn't be any cheaper than
the existing probes as there just isn't enough market to pull the price
down.

Gary Casey