Model 4-1200 gas tank drain loose info needed.

[Bourneredi]

I recently bought a model 4-1200. I just replaced the CAV-110 quick drains in the wings. The left drain was weeping fuel prior to replacement. The old drain came out very easy but the new drain will not snug up and just keeps turning as I attempt to tighten it. I have not put hardly any pressure on it so I think this is why it was weeping. The new drain is not stripped and so I assume the fitting in the tank is stripped or has come loose and is spinning. I did not build my plane and do not have the original plans for it. I can't really see how/ what the tank attachment is without cutting the wing covering which I obviously don't want to do. Has anyone built one of these tanks or do you have plans which show this area? Any help on this would be greatly appreciated. Thanks!

Randy

[Oneninerwhiskey]

Search the forum for "stripped threads in fiberglass".

[Bourneredi]

Search the forum for "stripped threads in fiberglass".

Thanks for the heads up!

[Lion8]

I have never tried this, but there is a product from #M, called 5200. My son used it on his boat. I have never seen anything like this stuff. Toughest sealant I have ever seen. I would recommend testing this if you decide to try it. Drawback?, expensive.
While I have the floor, I just found out that Fastenal co. carries AN fasteners. Hope this helps someone.

[Paul Z]

Here is the way I have seen composite aircraft tanks built. It look like a pain in the rear, but you will not have it go bad. The Aluminum Flange is available at Aircraft Spruce, it is an aluminum welding flange and it comes with pipe threads tapped into it. Just a suggestion.

[Slyfox]

my thought is to get a step up reducer. meaning, go to a bigger size fitting with the center being the same size as the drain. once you find that, you just drill out the tank and cut new threads for the fitting.