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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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 Posted: Mon Sep 17, 2007 8:48 pm Post subject: Fuel Tank Calibration Problem (Dynon FliteDek 180) |
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OK guys. I could use a little help here. I tried to calibrate my fuel gages
tonight but no joy. I have SW resistive floats and as I fill the tanks, the
Dynon system says the readings from the tank doesn't change as gas is added.
It's possible that the float is stuck, the wiring is incorrect, the Dynon is
bad or not setup correctly, or maybe the SW gage is bad. However, both tanks
act the same. I'm trying to remember how the gage is wired internally. There
is only 1 screw on the outside of the tank, that's probably the center tap
of the variable resistor attached to the float. How is the thing grounded
internally? I can't remember what it looks like inside. Does anyone have a
picture of their gage before it was installed in the tank they can share
with me? Did we have to ground the gage internally and I forgot to do that?
Thanks in advance,
Albert Gardner
Yuma, AZ
N991RV
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RV-9A N872RV
RV-10 N991RV |
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Dave(at)AirCraftersLLC.co
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| Posted: Mon Sep 17, 2007 9:35 pm Post subject: Fuel Tank Calibration Problem (Dynon FliteDek 180) |
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Albert,
You should be able to bend a coat hanger 90 degrees and thread it throught
the sump hole, then push up gently on the float arm. With a meter you
should see the resistance change between the center pin and any good ground.
I think the resistance is 40 to 240 ohms. That should troubleshoot the
float.
Good Luck,
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
831-750-0284 CL
www.AirCraftersLLC.com
--
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Mike Whisky
Joined: 05 Jun 2006
Posts: 336
Location: Switzerland
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| Posted: Mon Sep 17, 2007 10:13 pm Post subject: Re: Fuel Tank Calibration Problem (Dynon FliteDek 180) |
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Hello Albert,
check out the linmk below. Hope that helps.
http://www.wellenzohn.net/RV10Wings/fuellevelsender.html
Michael
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RV-10 builder (flying)
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jesse(at)saintaviation.co
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| Posted: Tue Sep 18, 2007 3:09 am Post subject: Fuel Tank Calibration Problem (Dynon FliteDek 180) |
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The first thing to try would be to see what resistance you have to ground
on the lead wire. It is possible that you don't have the right wire
connected to the sender. If you read a resistance at one level, then add
fuel, the resistance should change if the float is working (or the coat
hangar trick is a good idea). It should start changing almost immediately
if the float is installed correctly, as it ready accurately usually from 0
to 24 or 26 gallons, at which time the float is all the way at the top of
the tank and can't read the last 4-6 gallons.
If you do get resistance changes when you check at the float, then make
sure you have the right wire going to the Dynon (I can't remember which
pin it is right now, but will be in your installation manual) and make
sure you have continuity from the sender end of the wire to the pin in the
back of the connector. If this is shorted that would cause it not to
work. Also, if you somehow have the wires switched so the left is going
to the right and vice versa, then you would also be getting this problem
most likely, since the Dynon is specifically reading one pin for left and
the other for right. If this is the case, you can either re-route those
two wires or just switch them in the connector, depending on how "buttoned
up" your wiring is.
Before draining the tank and trying anything else, I would just test the
resistance as you add fuel (or even as you rock the wings as the float
will move if there is fuel in the wings when you rock it). You could do
it just by jacking up one wing to fake the float out in case you end up
having to remove all of the fuel you have put in already and don't want to
add more for this reason.
Hope this helps.
GOD BLESS!
Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
www.saintaviation.com
352-427-0285
Albert Gardner wrote:
| Quote: |
OK guys. I could use a little help here. I tried to calibrate my fuel
gages
tonight but no joy. I have SW resistive floats and as I fill the tanks,
the
Dynon system says the readings from the tank doesn't change as gas is
added.
It's possible that the float is stuck, the wiring is incorrect, the Dynon
is
bad or not setup correctly, or maybe the SW gage is bad. However, both
tanks
act the same. I'm trying to remember how the gage is wired internally.
There
is only 1 screw on the outside of the tank, that's probably the center tap
of the variable resistor attached to the float. How is the thing grounded
internally? I can't remember what it looks like inside. Does anyone have a
picture of their gage before it was installed in the tank they can share
with me? Did we have to ground the gage internally and I forgot to do
that?
Thanks in advance,
Albert Gardner
Yuma, AZ
N991RV
|
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Fri Sep 21, 2007 5:11 pm Post subject: Re: Fuel Tank Calibration Problem (Dynon FliteDek 180) |
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Albert,
I just finished installing mine and pressure tested it. I think the ground is the mount's screws attached to the airplane. The center screw picks up the resistance. Frankly, I don't think it makes any difference which way you wire it since it's just ohms, but I ain't no electrician....
Maybe you don't have a good ground. Put an ohmmeter to the big screw and one of the mounting screws to see what you got. The swing on mine was 31 full, 245 empty. Good luck.
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