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petcock leak

Engine, Fuel and Exhaust

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Old Sep 16th, 2009, 08:37 PM     #1
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petcock leak

Is there a special sealer or method of installing the "cross-over" style petcock and tube on an older fatbob tank? It leaks at the "banjo" fitting on the petcock. Regular teflon tape is no good, as is regular permatex. Thanks.
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Old Sep 17th, 2009, 03:49 AM     #2
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Re: petcock leak

Not sure if it will work but you can try a Pipe Sealant that contains Teflon made by Loctite.

I hope it helps

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Last edited by CatWoman; Sep 17th, 2009 at 03:50 AM. Reason: Spelling
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Old Sep 17th, 2009, 10:16 AM     #3
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Re: petcock leak

Quote: Originally Posted by Glassbreaker View Post
Is there a special sealer or method of installing the "cross-over" style petcock and tube on an older fatbob tank? It leaks at the "banjo" fitting on the petcock. Regular teflon tape is no good, as is regular permatex. Thanks.
If I read this right the threads are not leaking. The thru bolt to the banjo fitting should have a copper washers on each side of the "banjo". Sometimes they become "work hardened" from use. Try some new ones or heat the ones you have with a propane torch. You can see them change color slightly. Then let air cool. DO NOT USE WATER TO COOL. Rapid cooling will harden the copper again. The heat will soften the copper and sealable again. Not 100% sure it will work for you, but I have done this with pretty good success on some equipment when I was a millwright.

Last edited by Redfish-Joe; Sep 17th, 2009 at 10:17 AM. Reason: spelling
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Old Sep 17th, 2009, 09:16 PM     #4
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Re: petcock leak

Quote: Originally Posted by Redfish-Joe View Post
If I read this right the threads are not leaking. The thru bolt to the banjo fitting should have a copper washers on each side of the "banjo". Sometimes they become "work hardened" from use. Try some new ones or heat the ones you have with a propane torch. You can see them change color slightly. Then let air cool. DO NOT USE WATER TO COOL. Rapid cooling will harden the copper again. The heat will soften the copper and sealable again. Not 100% sure it will work for you, but I have done this with pretty good success on some equipment when I was a millwright.
i'm currently a millwright/industrial maechanic (10 years) the heating up and air cooling will most likely work/new will prob be very cheap and worth the peace of mind
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Old Sep 17th, 2009, 10:01 PM     #5
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Re: petcock leak

Quote: Originally Posted by 00BUCKSHOT View Post
i'm currently a millwright/industrial maechanic (10 years) the heating up and air cooling will most likely work/new will prob be very cheap and worth the peace of mind
I agree. Just depends on availabilty and desire to ride
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Old Sep 18th, 2009, 10:50 AM     #6
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Re: petcock leak

This kinda goes along the lines of a new copper "crush" gasket for the spark plug days and the banjo fitting for the brakes hoses. Technically, you "should" use new ones, but many opt to reuse "one more time..." because necessity sometimes outweighs "convenience"...
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Old Sep 19th, 2009, 02:11 PM     #7
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Re: petcock leak

I have a new banjo fittind and washers. Still leaks. I'm using a sealant and letting it dry for a few days before putting gas in. Then using a dye to see where the leak is, if it's still there. Thanks all .
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