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03-23-2014, 06:24 AM
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Join Date: Jan 2014
Location: Ardleigh, Essex, UK
Posts: 55
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Fuel leak thru BNC fuel sender plug
Hi Guys (Girls)
I am a new RV4 owner and have found that the BNC fuel tank sender "chassis plug" at the wing root are leaking through the center of the connector. This is covering the small PCB in fuel and is corrupting the data for the AFS3400 EFIS so I get erratic fuel contents indications.
Is this a common issue, is there a repair scheme?
I have no invoice to see where they were purchased from, can anyone advise a replacement source?
Thanks for your help.
Neil
http://s98.photobucket.com/user/Tips...]=1&sort=1&o=0
Last edited by TIPSYNIPPER : 03-23-2014 at 06:47 AM.
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03-23-2014, 06:32 AM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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neil,
to post a photo, upload the photo to photobucket, or any other photo hosting site, and place the link to the photo in your post on this forum.
upon uploading to photobucket, photobucket generates a link to the photo that I then copy into this forum, and viola, the photo appears in my post. hope that helps.
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03-23-2014, 06:34 AM
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Join Date: Jan 2014
Location: Ardleigh, Essex, UK
Posts: 55
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...thanks, will do, shame we can't upload direct from the confuser, I don't use photobucket but will sign up for it.
Neil
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03-23-2014, 07:55 AM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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Needs more sealant on the inside
This problem was commonly discussed about 5 years ago and comes up from time to time.
The most likely cause is the application of tank sealant. In order to prevent fuel from seeping through the center connector, the whole BNC inside the tank and a few inches of the connected wire need to be covered in sealant.
If the BNC is only sealed around the penetration hole, fuel will seep into the wire strands and migrate into the connector and around the center pin.
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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03-23-2014, 08:04 AM
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Join Date: Jan 2014
Location: Ardleigh, Essex, UK
Posts: 55
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Hi Bill,
Thank you very much for the prompt reply.
That sounds very much like the issue I have. What would be your recommendation for a repair scheme please?
The fuel tank sealant comes in a large tube, I will only need a small amount, any suggestions?
Neil
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03-23-2014, 08:07 AM
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Join Date: Jan 2007
Location: USA
Posts: 256
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Quote:
Originally Posted by TIPSYNIPPER
Hi Bill,
Thank you very much for the prompt reply.
That sounds very much like the issue I have. What would be your recommendation for a repair scheme please?
The fuel tank sealant comes in a large tube, I will only need a small amount, any suggestions?
Neil
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If you only need a small amount?
http://www.vansaircraft.com/cgi-bin/...eal&action=add
__________________
James King
RV-7
919
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03-23-2014, 08:10 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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proseal
Quote:
Originally Posted by TIPSYNIPPER
Hi Bill,
Thank you very much for the prompt reply.
That sounds very much like the issue I have. What would be your recommendation for a repair scheme please?
The fuel tank sealant comes in a large tube, I will only need a small amount, any suggestions?
Neil
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There must be RV builders over there. Almost every builder has some left. If not, Vans sells a smaller container.
Depending on how the access plate was attached, you may need some to reseal it as well.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-23-2014, 03:35 PM
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Join Date: Oct 2007
Location: Birmingham United Kingdom
Posts: 374
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Try LAS
Neil
LAS aero sell a small kit that you can mix up as much as you need and keep the rest for another time.
Also it looks like if you open the inspection plate it would be a good idea to refit it with sealant as well plus put some on each screw as you refit it.
Cheers
Peter
__________________
RV7 G-PBEC Flying
RV10 Finishing
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03-23-2014, 04:37 PM
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Join Date: Jan 2014
Location: Ardleigh, Essex, UK
Posts: 55
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Thanks Guys,
Larry, your blog helps no end as I am now better informed as to what I am going to find when I open up the inspection hatches. What have/are you using to seal your inspection hatches? I am reluctant to use proseal, as it is a bugger to get apart once cured I would think, and if I need to get inside the tank again that may be a problem. I am thinking of using Permatex?
If the wire is just soldered to the center pin I don't see that fuel seeping down the wire can be a problem, it must be coming from around the center pin, possibly due to excess heat when soldering and not coating the chassis plug with sealant? or even a defective chassis plug? I will know more once I get inside. I think maybe using permatex to seal the chassis plug?
Neil
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03-23-2014, 04:56 PM
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Join Date: Jul 2007
Location: Pembrokeshire, UK
Posts: 224
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Hi Neil
I used Permataex Form A Gasket for my inspection plates and no leaks to date (140 hrs/nearly 2 years). If you contact me off list I may even have some left from the project if its not lifex.
__________________
Bob Ellis
www.rv-8.co.uk
G-JBTR Having a ball flying this wonderful machine
Donation July 2016
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