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  #1  
Old 12-27-2011, 11:06 AM
dmcewen dmcewen is offline
 
Join Date: Jan 2005
Location: Henderson, NV
Posts: 16
Default Dynon fuel quantity

During construction I calibrated the fuel quantity gauge according to the plans. During phase one flight testing on a high angle of attack power on turning stall I think the float in the tank got stuck somehow. For the next 15 hrs. the quantity on the Dynon read 14 gallons, then yesterday during a flight it droped suddenly to 0. After the flight I disconnected the lead to the sender and measured the resistance on the float (246 ohms) then added 7 gal of fuel, resistance stayed the same. I am thinking the float may have failed in the tank someway. Any thoughts/ideas?
Dick
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  #2  
Old 12-27-2011, 11:16 AM
JBPILOT JBPILOT is offline
 
Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,613
Default Hey Dick - -

Be sure you have a good ground. I did so good dipping the front plate screws, I did not have a ground. Had to run a separate wire to the sender itself. With your meter, check from the terminal to the aircraft frame.

John Bender
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  #3  
Old 12-28-2011, 06:03 AM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
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Default

Quote:
Originally Posted by JBPILOT View Post
Be sure you have a good ground. I did so good dipping the front plate screws, I did not have a ground. Had to run a separate wire to the sender itself. With your meter, check from the terminal to the aircraft frame.

John Bender
Same here - ground wire fixed the problem. I suggested adding this as standard but Van's didn't think it was necessary.
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  #4  
Old 12-28-2011, 10:11 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,958
Default

Quote:
Originally Posted by BigJohn View Post
Same here - ground wire fixed the problem. I suggested adding this as standard but Van's didn't think it was necessary.
A different (simpler) change was made.... Added an internal tooth lock washer to one each of the sender flange and cover plate screws, to make a good ground connection through a film of tank sealant.
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  #5  
Old 12-28-2011, 10:35 AM
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Tony_T Tony_T is offline
 
Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,238
Default Page 37-04 no internal tooth lock washers?

Quote:
Originally Posted by rvbuilder2002 View Post
A different (simpler) change was made.... Added an internal tooth lock washer to one each of the sender flange and cover plate screws, to make a good ground connection through a film of tank sealant.
Good information, I plan to do this with the fuel tank mod, but I don't see them on the latest revision of the fuel tank plans.

How about including them in the fuel tank mod kit, or at least spec them out so we can buy them .

Tony
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Last edited by Tony_T : 12-28-2011 at 10:42 AM. Reason: sp
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  #6  
Old 12-28-2011, 10:38 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,958
Default

Quote:
Originally Posted by Tony_T View Post
Good information, I plan to do this with the fuel tank mod, but I don't seem them on the latest revision of the fuel tank plans.

How about including them in the fuel tank mod kit, or at least spec them out so we can buy them .

Tony
Hmmmm... I was pretty sure a revision had been implemented for this. I will try and remember to check when I am no longer "on vacation".
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  #7  
Old 12-29-2018, 02:05 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 35
Default

Bob and I will check for ground wire to sensor in fuel tank also. N836BL 2015 build RV-12. Thanks!
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  #8  
Old 12-29-2018, 02:59 PM
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DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,962
Default

Lock washer didn’t do it for me. There seemed to be no good ground to the fuse after our tank overhaul and SB work. I had to add a ground wire.
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  #9  
Old 12-29-2018, 04:03 PM
Michael Burbidge Michael Burbidge is offline
 
Join Date: May 2006
Location: Sammamish, WA
Posts: 592
Default Stewart-Warner?

I assume we're talking about the Stewart-Warner senders, correct?

Originally when I built my plane I used Vans round gauges. The fuel gauges generally worked.

I recently installed a JPI EDM 740 engine monitor. The engine monitor is more finicky when it comes to the resistance coming from the senders. I am having problems with the left side. When I measured the resistance I found that I don't have a good ground.

Are you suggesting removing one of the fuel sender mounting screws and putting a lock washer under it. It seems that would introduce a fuel leak at that screw.

I don't see any other way to mount the ground wire to the sender. I've considered glueing the ground wire to a bare spot on the sender mounting plate using electrically conductive epoxy.

Next time, I would modify the mounting plate to include a grounding screw.

Michael-
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  #10  
Old 12-29-2018, 08:40 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,757
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Electrically conductive epoxy might conduct static electricity. I doubt that it would conduct low voltage signals.
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