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Fuel sender mount heads-up

 
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Deems Davis



Joined: 09 Jan 2006
Posts: 925

PostPosted: Sun Feb 05, 2006 6:51 am    Post subject: Fuel sender mount heads-up Reply with quote

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:

Quote:


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 Sad
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:

>
>
> 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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Dick Sipp



Joined: 11 Jan 2006
Posts: 215
Location: Hope, MI

PostPosted: Sun Feb 05, 2006 8:35 pm    Post subject: Fuel sender mount heads-up Reply with quote

Guys:

Remember the fuel tank sender units supplied by Van are two different part
numbers and are "left and right"

Quote:
From page 18-7 second line' "Use part number IE-385B for the left fuel tank;
use IE F-385C for the right tank."


I'm not sure if this is related to the issue being discussed but a
possibility at least.

Dick Sipp
N110DV #40065


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ddddsp1(at)juno.com
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PostPosted: Mon Feb 06, 2006 1:01 am    Post subject: Fuel sender mount heads-up Reply with quote

I want to thank Larry Rosen for his idea on using the OHM meter to measure the travel of the fuel senders on the Quickbuild installation.  On both tanks originally I was hitting the vent tube with the sender float.  On the left tank there was not enough room between the vent line and stiffener for the float anyway.  Considered cutting the float back or sticking a bar in the tank and pry the vent tube over to make room.  I did neither.............ended up twisting the wire holding the float 90 degrees.  By doing this the float easily fit between the stiffener and vent line AND still had full travel.  We measured the OHMS with the sender on the workbench to determine FULL travel.  When we got done positioning them in the tanks as detailed aboved..........we got the same readings on the OHMS meter................32 OHMS and 250 OHMS.   Thanks again LARRY R.
DEAN

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PostPosted: Mon Feb 06, 2006 3:03 am    Post subject: Fuel sender mount heads-up Reply with quote

Van's original shipment to me had both senders for the left wing.
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PostPosted: Mon Feb 06, 2006 3:04 am    Post subject: Fuel sender mount heads-up Reply with quote

Be sure and bend that 90 into the last half inch of the sender. I examined a friend's 8 and found he has not bent the 90 and as a result would have fishing his sender from the tanks at some point. Do not archive.
[quote] ---


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LarryRosen



Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ

PostPosted: Mon Feb 06, 2006 8:12 am    Post subject: Fuel sender mount heads-up Reply with quote

Thank you, but I cannot take credit for the idea. It came from someone else on this list a few months back.
I cannot imagine trying to get through the build without the support of this community.
Larry
http://lrosen.nerv10.com
DO NOT ARCHIVE
-------------- Original message ----------------------
From: "ddddsp1(at)juno.com" <ddddsp1(at)juno.com>
Quote:
I want to thank Larry Rosen for his idea on using the OHM meter to measure the
travel of the fuel senders on the Quickbuild installation. On both tanks
originally I was hitting the vent tube with the sender float. On the left tank
there was not enough room between the vent line and stiffener for the float
anyway. Considered cutting the float back or sticking a bar in the tank and pry
the vent tube over to make room. I did neither.............ended up twisting
the wire holding the float 90 degrees. By doing this the float easily fit
between the stiffener and vent line AND still had full travel. We measured the
OHMS with the sender on the workbench to determine FULL travel. When we got
done positioning them in the tanks as detailed aboved..........we got the same
readings on the OHMS meter.................32 OHMS and 250 OHMS. Thanks again
LARRY R.
DEAN

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PostPosted: Mon Feb 06, 2006 10:50 am    Post subject: Fuel sender mount heads-up Reply with quote

Yep, I had the same thing except mine were in the correct boxes.  Ended up re-doing one of them so it would work.  Fun trying to figure out if you have two left or two right when the boxes are correct.  If I had to do tanks again I would do capacitance just to reduce the likelihood of any future problems.

Michael Sausen
-10 #352 Fuselage

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