----- Original Message -----
Sent: Friday, April 06, 2007 08:27
PM
Subject: [LML] Testing for fuel leaks and
fuel probes to use
I use sight gauges for all three tanks.
The top of the gauge is connected to a T at the wing
tank tip vent with a tube, called the reference leg, to provide proper
pressure to balance the fuel column.
During testing I accidentally ran a tank dry due to
condensation in the reference leg causing a pressure differential that
resulted in a high reading. I solved that by collecting pitot air pressure
with a tube on the belly and metering it with an orifice through the reference
legs keeping them clear of condensation. It has been trouble free since then,
2000 hr.
I always keep plenty of fuel in the
header.
If there is serious interest I will take some photos
and draw a sketch.
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