Sealant For my petcock

[Guest]

I'm going to go later and get some sealant to try and fix my leak that I brought up in another thread. My question is what kind should I get.

[bonanzadave]

I use polysulfide to seal gas tanks. ProSeal. Its awfully expensive.

http://www.aircraftspruce.com/search/search.php?query=proseal&searchsubmit=Search&search=1

[Guest]

I use polysulfide to seal gas tanks. ProSeal. Its awfully expensive.

http://www.aircraftspruce.com/search...earch&search=1

I'm needing something that will seal the petcock to the tank. heres a link to my other thread.

http://www.thegsresources.com/_forum/showthread.php?t=195221

[tas850g]

I use the OEM rubber gasket and I've had no leakes. I've had to use a white thread sealer for the screws though. Not locktite.

[Nessism]

No monkey snot bandaids. Fix the problem. Gasoline is nothing to play games with.

[Guest]

Using sealant is my last resort. As stated in my other thread everything has been replaced with new OEM parts. The mounting surface is clean.

[Nessism]

Using sealant is my last resort. As stated in my other thread everything has been replaced with new OEM parts. The mounting surface is clean.

You must be overlooking the root cause of the problem then. I strongly advise you to fix the problem properly, without sealer. What about draining the tank and introducing some air pressure while using soapy water to find the leak location?

[tom203]

All new parts.... but have you checked depth of o-ring groove- if it was made too deep (easy manufacturing error), the o-ring couldn't seal. My old petcock had depth of 2 mm.

[Loki]

I use polysulfide to seal gas tanks. ProSeal. Its awfully expensive.

http://www.aircraftspruce.com/search...earch&search=1

Bingo. I sealed the 1000 tank I welded back together with 1422 A-2 thinned with MEK. Good for about 35 years. Makes for great bed seals also for parts, like petcocks.

[Loki]

Using sealant is my last resort. As stated in my other thread everything has been replaced with new OEM parts. The mounting surface is clean.

Could be a hairline crack in a bolt hole.

[Tola]

3m weatherstripping sealant, fuel and oil resistant, it works.

[Nessism]

3m weatherstripping sealant, fuel and oil resistant, it works.

Weatherstrip sealant to keep fuel off the top of the engine, just inches from your crotch?

[Tola]

Sometimes we can make things sound much worse than the reality of a situation. Sealant is not a substitute for o-ring but it there is a small amount of seaping it works. A small leak prior to adding sealant is not going to turn into a spontaneous huge leak, drip gas on the engine and set your balls on fire.

[rustybronco]

Why are you trying to seal the petcock to the tank? Wouldn't it be better to find the source of the leak and fix that. Did you try a leak tracing powder to find the source of the leak yet?

[Guest]

Pingel supplies Hylomar with their petcocks. Works very well.