When my Legacy fuel pump starves out, I can
get no more than a couple of drops out of the fuel tank sump. That would
indicate that there is no unusable fuel in the tank. The problem is that I
am certain that would not be the result in flight. Sloshing fuel would
unport the inlet. My personal minimum is 5 gal or (in my case) 1/8th
tank.
B2
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dennis Ramsey
Sent: Friday, April 20, 2012 9:21
AM
To: lml@lancaironline.net
Subject: [LML] Fuel Tank
Calibration Followup
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.