leaking nose tank

[Victor Gisclair]

Re: leaking nose tank

Marty check the filler neck where it joins the tank, I bet that it is comming from there. easy fix.
Vic
N95110

[M Towsley]

Re: leaking nose tank

Vic,

That is what I thought, however, the small panel that covers the neck looks heavily painted over. Plus, somehow, I think I have to remove the hinge line holding the upper cowl to be able to remove it. All the screws, etc., have paint over them. Am I assuming correctly the plate over the filler neck has to be removed? I removed the flat rubber o-ring from around the neck, but cannot get to the actual neck because of the close tolerance of that cover plate. Let me know if this is the way to go, and when I have time I will try and remove that cover plate. Thanks!

Marty

[Robert Lees]

Re: leaking nose tank

Marty:

There shouldn't be a plate there, unless there was reason for a previous repair to the filler neck. Perhaps a previous "fix" has become "unfixed".

Rob

[M Towsley]

Re: leaking nose tank

Whatever it is, it was nicely done! When I get a chance I will send you a picture off line.

Marty

[Carl Ellis]

Re: leaking nose tank

Along these lines....I have smell of fuel in the cockpit, more so when the tank is full and sloshes.
Marty
'46 BC-12D

Marty -

My F-19 has a short rubber vent line that attaches at the top of the tank. The rubber failed resulting in a bad fuel smell if the tank was overfilled or sloshed.

The line was replaced from the top by removing the deck above the tank and panel.


- Carl -

[VictorBravo]

Re: leaking nose tank

Gentlemen... I believe there are one or more "fuel tank sloshing compounds" that can be used to fix pinholes as long as the tank is structurally safe. These compounds are certified. The only trick would be (without removing the tank) properly cleaning out the tank with solvent and then getting the sealant into all the corners without rotating the fuselage. But, a good spray wand or custom made long bent brush should be able to get it done.

Bill

[Robert Lees]

Re: leaking nose tank

...but check that the sloshing compound is unaffected by aromatic fuels, alcohol, mogas etc.

[Karl Rigdon]

Re: leaking nose tank/filler neck

Years ago I had to do some engine work. After the engine and mount was removed I decided to remove the boot. The filler neck was held in place with several screws through a flange. At this stage I thought this was normal. As the last screw was removed there was a loud noise of something hitting the bottom of the tank. With the filler removed I could see where the filler neck had been removed by using a saw. A flange was fabricated and welded to the filler neck. Now the retaining plate was in the bottom of the tank. With a magnet I got the plate to the opening. That is when I asked myself how did they get the plate through a hole smaller than the plate. There was a slot in the plate so it could be sprialed to the inside.
The flange and retainer plate were drilled and the inside plate tapped. Using a threaded rod the plate can be held held in place while the gasket and filler neck are threaded into place and the screws installed.
The IA that maintained this airplane before I aquired it was very clever mechanic and a outstanding fabric man. I am sorry to say he has been gone several years and that expertise is gone forever.

[mhorowit]

Re: leaking nose tank

You have checked to insure there is no seepage around the cut-off valve stem? - Mike

[Victor Gisclair]

Re: leaking nose tank

Marty I had to take my tank out to repair it where the fuel shut off value goes in. My filler neck was lose. I was able to pull it up and out. I then Put Pro seal around the neck and reinstalled it. It been working great sence then. I am sure that I could remove the filler neck by removing the rubber around it and then pulling it up. I hope this helps.
Vic
N95110

[M Towsley]

Re: leaking nose tank

Thanks guys, I was out-of-town for a week and just got back. I will do some further investigation.......

Marty