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12-27-2011, 10:06 AM
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Join Date: Jan 2005
Location: Henderson, NV
Posts: 16
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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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Dick McEwen
RV-6A
Henderson, NV.
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12-27-2011, 10:16 AM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,657
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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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12-28-2011, 05:03 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Quote:
Originally Posted by JBPILOT
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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Same here - ground wire fixed the problem. I suggested adding this as standard but Van's didn't think it was necessary.
__________________
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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12-28-2011, 09:11 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by BigJohn
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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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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12-28-2011, 09:35 AM
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Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
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Page 37-04 no internal tooth lock washers?
Quote:
Originally Posted by rvbuilder2002
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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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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Tony
E-LSA RV-12 ULS
Last edited by Tony_T : 12-28-2011 at 09:42 AM.
Reason: sp
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12-28-2011, 09:38 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Tony_T
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
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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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12-29-2018, 01:59 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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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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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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12-29-2018, 03:03 PM
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Join Date: May 2006
Location: Sammamish, WA
Posts: 654
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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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Michael Burbidge
Sammamish, WA
RV-14A Empennage
RV-9A Flying?340 hours!
Last Donation: December 2019
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12-29-2018, 07:40 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Electrically conductive epoxy might conduct static electricity. I doubt that it would conduct low voltage signals.
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Joe Gores
RV-12 Flying
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