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Posted for [EMAIL PROTECTED]:
If you are using Vision Microsystems fuel quantity monitoring system, you
are limited to a minimum probe length of about 14 inches. The three wires
at the probe are ground, +5 volts and a square wave frequency resulting
from a resistance capacitance (amount of fuel) circuit. I used an 8-9 inch
vertical probe in my header tank that produced a frequency too high for the
computer with less than 3 gallons in the tank. Frequency counts are what
you report to VM for fuel level calibration.
I constructed a bump in the cable using the available power to drive a CMOS
frequency divider. Thus, the halved frequency was compatible with the
computer and provides me with a very accurate measure of remaining header
tank fuel.
Scott Krueger
N92EX
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