Need help with a fuel tank leak.

[brenegan]

So lemme picture this... in the center of the connector on the
outside of the tank you have some bubbling?


And you opened the tank back up and gooped more proseal on the
connector and wire. IMHO, won't help. Wick some green loctite.
You didn't say if you tried it... I'll bet you didn't.

[AX-O]

Originally Posted by brenegan

So lemme picture this... in the center of the connector on the outside of the tank you have some bubbling?

Yes, that is correct.

Originally Posted by brenegan

And you opened the tank back up and gooped more proseal on the
connector and wire. IMHO, won't help. Wick some green loctite.
You didn't say if you tried it... I'll bet you didn't.

I opened the tank and apllied proseal to the connector and wire. I did not try the green loctite. Where do I find it and how durable would that method be? Will it still be good 5 years from now? Thanks for the help.

[brenegan]

I can't tell you about 'five years from now' sorry.... My tanks aren't flying yet. What I can say is this, the stuff wicked in very well, didn't affect
electrical conductivity and resolved my problem. That's what I can attest to.
I pressure tested this tank for several days on accident because I went on
a business trip at the time. Search for 'green loctite' on this site and you'll
see it's used to resolve issues in other cases of tank leaks and is very
durable. Google for green loctite for places to buy it. Make sure you get the 'loctite' brand.

[RV8RIVETER]

I am sorry I saw this thread late. I had the same problem. I reopened and then packed the proseal as hard as I could and then taped a shop vac to the outside of the connector and pulled a vacuum on it for about 45min to an hour. Had no more leaks. If I were to do it again I would spend the $ and buy an aircraft grade, tank bulkhead BNC.

[brenegan]

Originally Posted by RV8RIVETER

I am sorry I saw this thread late. I had the same problem. I reopened and then packed the proseal as hard as I could and then taped a shop vac to the outside of the connector and pulled a vacuum on it for about 45min to an hour. Had no more leaks. If I were to do it again I would spend the $ and buy an aircraft grade, tank bulkhead BNC.

I bought some of those 'Aircraft grade' bnc connectors at boeing surplus
before the retail store closed; never used them. strictly speaking, you don't
need them; but they would probably eliminate the leak if installed correctly.
Then again, the kit supplied connectors won't leak either imo.

[AX-O]

Well, the tank leak is fixed (99% sure)

I did not want to use the loctite method because I did not know how permanent that fix would be and I would not want to deal with it after I was flying. I decided to try something else. I mixed a batch of proseal and poured MEK in the container to thin out the proseal. After I was happy with the proseal (consistency like runny toothpaste), I used a toothpick and placed proseal on the small hole in question. Instead of putting a vacuum on the tank, I decided to connect the line that I was using as the manometer on the outside of the BNC connector and blew the proseal inwards by using my mouth. I repeated that step 3 times until no more proseal would go in. I placed proseal one more time on the middle hole of the BNC connector and then used about 20 psi to blow the proseal inside the connector (tank was free to vent in case I blew out the BNC connector). Once that was done I cleaned the excess proseal from the connector and waited almost 2 weeks prior to testing. The tank was tested for about 16 hrs and the water level actually went up. One more major step accomplished.

[Lucio I-NLCM]

hello gent

After 6 years and 630h I found the same fuel leaking problem, my left wing leak fuel from bnc connector.

so after years from your leak fixed, I’m wondering if it still doesn’t leak or…

I’m doing the same way in first, hoping to fix it without pull access plate.

thanks a lot

Originally Posted by AX-O

Well, the tank leak is fixed (99% sure)
I did not want to use the loctite method because I did not know how permanent that fix would be and I would not want to deal with it after I was flying. I decided to try something else. I mixed a batch of proseal and poured MEK in the container to thin out the proseal. After I was happy with the proseal (consistency like runny toothpaste), I used a toothpick and placed proseal on the small hole in question. Instead of putting a vacuum on the tank, I decided to connect the line that I was using as the manometer on the outside of the BNC connector and blew the proseal inwards by using my mouth. I repeated that step 3 times until no more proseal would go in. I placed proseal one more time on the middle hole of the BNC connector and then used about 20 psi to blow the proseal inside the connector (tank was free to vent in case I blew out the BNC connector). Once that was done I cleaned the excess proseal from the connector and waited almost 2 weeks prior to testing. The tank was tested for about 16 hrs and the water level actually went up. One more major step accomplished.

[Lucio I-NLCM]

hi
I did exactly the same like AX-O and fix the problem; no more any leak from bnc connector.
Just to know, I used tank sealant expired from 2009 it work perfectly
Yes guys, I’ve checked before use it

thanks AX-O