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Date: Fri, 20 Apr 2012 09:21:11 -0400
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Subject: Fuel Tank Calibration Followup
From: Dennis Ramsey <doramsey@gmail.com>
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Thanks to all who responded both on the LML and privately.  In the end I
had an issue with incorrect pinnout on a DSUB for the right wing input.
When I discovered  that problem (after two days of troubleshooting and
testing wires) and corrected the pinnout and drawings, the problem went
away.  And for the record the system easily recognizes one gallon of fuel (
I have the Garmin G3X).   I have an old kit so the probes are the 8 foot
probes originating at the wing root.   I am very pleased with the probe
overall.  I added a gallon at a time to the wings and got  a good detection
of each gallon up until about 39 gallons in my 40 gallon wings.   I have
heard stories of high quantities of unusable fuel in these birds.   Granted
this is not a completely valid test because it is not simulating the
backpressure of the engine, but the pump loss of flow coincided with the
fuel level reading zero gallons.    I would be interested if others had
experienced similar results.   I am curious as to what the real world
experience has been on unusable fuel and how you tested it.

Thanks again!   Dennis

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<div>Thanks to all who responded both on the LML and privately.=A0 In the e=
nd I had an issue with incorrect pinnout on a DSUB for the right wing input=
.=A0 When I discovered=A0 that problem (after two days of troubleshooting a=
nd testing wires) and corrected the pinnout and drawings, the problem went =
away.=A0 And for the record the system easily recognizes one gallon of fuel=
 ( I have the Garmin G3X). =A0=A0I have an old kit so the probes are the 8 =
foot probes originating at the wing root.=A0=A0 I am very pleased with the =
probe overall.=A0 I added a gallon at a time to the wings and got=A0 a good=
 detection of each gallon up until about 39 gallons in my 40 gallon wings.=
=A0=A0 I have heard stories of high quantities of unusable fuel in these bi=
rds.=A0=A0 Granted this is not a completely valid test because it is not si=
mulating the backpressure of the engine, but the pump loss of flow coincide=
d with the fuel level reading zero gallons.=A0=A0=A0 I would be interested =
if others had experienced similar results.=A0=A0 I am curious as to what th=
e real world experience has been on unusable fuel and how you tested it.=A0=
</div>
<div>=A0</div><div>Thanks again!=A0=A0 Dennis=A0</div>

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