REFLECTOR: Fuel sight guages..why?

[David Bertram]

Al I also have the Atkinson sight gauges and I also use mogas.  Both of my
gauges are stopped up.  Where exactly did you drill through the gauge and
did you go all the way into the tank?  Dave Bertram
 
-------Original Message-------
 
From: Velocity Aircraft Owners and Builders list
Date: 02/15/08 11:37:51
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Fuel sight guages..why?
 
Alex wrote:
 
The fuel flow computer can be pretty accurate for burn rate, but not always,
especially on mine, which has a return line, so there are 2 transducers and
the computer needs to do the math to figure out how much is being burned- so
less accuracy- also any cavitation in the return line will make them even 
less accurate- so I won’t really rely on them, 
 
I agree with these comments – when using flow scan type flow measurement. 
If the measurement is made by using the fuel injection pulse width and pulse
count on electronic injection system – as mine is; it is very accurate. 
After some calibration adjustment the fuel burn is within a couple percent
of measured.
 
Terry wrote:
 
I have the Akinson sight gauges, and for some reason my LH one is blocked. 
It worked fine for one day only when I was doing my mo-gas slosh of the
tanks during construction,
 
As I learned the hard way; the white plastic backing in the Atkinson sight
gauge swells in the presence of auto fuel, and will cause the small holes to
the tank to close. I was able to open mine a couple of times using a wire
through the filler cap (my cap is closer to the fuselage than standard); but
it always closed again.  Vance sent me a new gauge which includes metal
grommets to put in the holes.  
 
Rather than remove/replace the gauge, I drilled ¼” holes through the clear
from the cabin side, inserted the grommets and closed the hole with EZpoxy
microglass.  Now it works.
 
Al
 
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