Dear Grant Harbor,
If you want to determine the remaining fuel of the tank by ultrasonics,First you must have a floating porbe that touches the liquid surface always.
Second, you must konw the velocity of sound in that particular liquid.
If you have both devices then you cam program your calculation based on the front surface echo.
For more details contact me.
I believe this measurement problem can easily be solved with distance measurement by air borne sound. You might get some helpful information at www.opara.deRegards,
P. ToebbenStressTel Europeptoebben@aol.comwww.stresstel.de
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