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  #1  
Old 03-23-2014, 07:24 AM
TIPSYNIPPER TIPSYNIPPER is offline
 
Join Date: Jan 2014
Location: Ardleigh, Essex, UK
Posts: 55
Red face 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 07:47 AM.
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  #2  
Old 03-23-2014, 07:32 AM
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blueflyer blueflyer is online now
 
Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,084
Default

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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  #3  
Old 03-23-2014, 07:34 AM
TIPSYNIPPER TIPSYNIPPER is offline
 
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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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  #4  
Old 03-23-2014, 08:55 AM
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rzbill rzbill is offline
 
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,752
Default 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.
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ME/AE '82
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  #5  
Old 03-23-2014, 09:04 AM
TIPSYNIPPER TIPSYNIPPER is offline
 
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Location: Ardleigh, Essex, UK
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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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  #6  
Old 03-23-2014, 09:07 AM
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kinger kinger is offline
 
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Location: USA
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Quote:
Originally Posted by TIPSYNIPPER View Post
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
If you only need a small amount?

http://www.vansaircraft.com/cgi-bin/...eal&action=add
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  #7  
Old 03-23-2014, 09:10 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,772
Default proseal

Quote:
Originally Posted by TIPSYNIPPER View Post
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
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.
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Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
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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  #8  
Old 03-23-2014, 04:35 PM
kiwipete kiwipete is offline
 
Join Date: Oct 2007
Location: Birmingham United Kingdom
Posts: 436
Default 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
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  #9  
Old 03-23-2014, 05:37 PM
TIPSYNIPPER TIPSYNIPPER is offline
 
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Location: Ardleigh, Essex, UK
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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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  #10  
Old 03-23-2014, 05:56 PM
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Bob Ellis Bob Ellis is offline
 
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.
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