LarryRosen
Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ
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 Posted: Sat May 12, 2007 4:10 am Post subject: QB Wing Inspection and Questions (fuel sender installation) |
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Its not fun.
From my archives:
I built my own tanks but still had a lot of difficulty getting the
sender on one side to go thru its full range of motion without
hitting/binding on a stiffener at either the top or bottom. It only
happened on one side. I finally determined that the angle that the
sender unit was mounted to the attach plate was different that the other
unit. No amount of bending would help because anything that I did to
make it better on one end of the travel only made it worse on the other.
They are assembled using a single large rivet. And appparently the
quality control is weak. I was able to 'adjust' the angle with some
encouragement from the vise and a pair of channel locks, and the problem
disappeared as the 'swing plane' was now correct.
Deems Davis # 406
Wings- finishing
http://deemsrv10.com/
Larry Rosen wrote:
This is how I installed the fuel sender into my quickbuild wings
I bend the rod per the plans.
I attached safety wire to the rod
The safety wire was fished through the bottom drain opening (VA-112)
I connected a multimeter to the fuel sender and measured the resistance
through the range of the fuel sender using the safety wire to move the
float up and down.
I would shine a flash light through the finger strainer (VA-141) on the
inboard side of the wing and try to look through the drain opening with
the safety wire to see where the float was hitting.
Then remove the fuel sender, tweak / rebend the rod, re-install and
check the range of motion with the multimeter.
Do this over and over again until you get the full range from the float 
Real pain in the a$$.
In the end I got resistance reading
Right tank: empty 247 ohms, full 29 ohms
Left tank: empty 246 ohms, full 33 ohms.
There is a picture of the safety wire through the drain opening on my
website. Now I need to add the commentary to have it make sense. The
photo is here
<http://lrosen.nerv10.com/Construct/Log/Wings/FuelLevel/index.html>
Larry Rosen
http://lrosen.nerv10.com
Tim Lewis wrote:
| Quote: |
I ran a piece of string through a couple of holes (in the access
plate, as I recall) allowing me to pull the sender up and down (using
the string). I had the same problem with limited movement.
I suggested to Vans that the fuel sender be included with the QB wing,
and that the sender arm be bent when the tank is being built.
Otherwise, as you noted, it's difficult (I gave up) to get it adjusted
so it moves freely without binding on stiffeners somewhere.
Tim
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Dave Leikam wrote:
| Quote: | How do you adjust the fuel sending floats in the QB tanks? You cannot
access the inside of the tanks to adjust travel of the floats.
Dave Leikam
40496
QB wings
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_________________
Larry Rosen
#40356
N205EN (reserved)
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