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For those of you that have installed your fuel flow
transducer
upstream of the gascolator, have you found
the need to install any sort of
fuel filter? I'm
using the Floscan 201B )for a RMI uMonitor) and
was
concerned that any largish chunks that aren't caught
by the finger
strainers in the header tank, might be
large enough to jam the small turbine
wheel in the
transducer and shut down the flow. I contacted
Floscan
and couldn't get them to give me any sort of
answer on how large a particle
the transducer could
tolerate. Some of the RV guys have installed
fuel
filters upstream which have also helped to reduce the
pulses from the
mechanical pump which had caused some
of them to get inaccurate
readings. Any of you do
this? Thanks.
Scott
The Floscan fuel transducer on my bird is mounted on the firewall down
stream from the gascolator and boost pump. I use straight fittings both in
and out of the transducer. The transducer is interfaced to a RMI
uMonitor.
I get very accurate readings of the fuel flow to actual fuel usage.
The RMI uMonitor is programmable so the user can dial in the actual engine fuel
flow.
In my case, I have it dialed in a little high, so I most always have about
5 to 1 gallon more of fuel actually remaining when dipping the tanks
after a flight. Sort of a little 'peace of mind' that I have at least
the fuel that it shows and maybe a little more remaining. That is about
1.5% to 3% more flow indicated than is actually occurring. So, at cruise,
when the uMonitor is indicating 8.5 GPH, 8.25 GPH is actually
occurring. All that is close enough for me as there is always some
inaccuracies when dipping 3 tanks. Being off by just a .25 gallon per tank
when dipping; well there is .75 gallon right there.
Of the RV's on this field, and there are several, I have not heard of
anyone speak of pulses from the mechanical pump causing inaccurate flow
readings. If there are inaccuracies, it may be they used 90 degree
fittings at the transducer instead of straight fittings. If I recall, the
RMI instructions indicate to use straight fittings in and out to reduce fuel
turbulence. But that is another subject.
This post may be a little off of your direct questions, but it is directed
to the point about mounting the fuel transducer up or down stream from the
gascolator.
Gary Edwards
N21SN 235/320
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