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Tricks for stoping a leaky valve?

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Mike CA

11-24-2007 16:01:55




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The valve in my sediment bowl is leaking just a bit when cranked fully closed. The Mrs. is going to want no gas leaking in the garage, so I need to lock that thing up. Any suggestions? My friend said if it was worn and/or pitted, it would cause the leak, but he didn't have a fix suggestion. Replacing it with a new one would run $50, so I'm not keen on that idea.




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LenNH

11-25-2007 06:48:26




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
If gas is leaking on floor, it would do that either with fuel needle valve ON or OFF, no?
Sounds like the leak is AROUND the shaft. I don't know what the original packing is like, but I think, like some of the helpful people who wrote here, that some sort of plumbing packing might work. If you have ever repacked a standard plumbing valve by wrapping a little teflon plumber's packing OR the string-type of packing around the stem and then putting the nut back on and tightening a bit, you'll know what I mean (both types of packing sold in plumbing section of hardware stores), you'll know what I mean. Can be done in five minutes.
Agree with others here NOT to tighten the fuel valve too much. If it is correctly shaped and smooth, it will shut off the fuel. Sometimes after years of wear, a groove gets cut in the tapered part of the valve, and there will be a leak through the fuel line, but this shouldn't affect the seal at the packing nut. Everything here is probably brass, and can take only so much pressure. This includes the brass nut that the packing would go into.
Hope this helps a little. It is great how people share their ideas with one another here.

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Armand Tatro

11-25-2007 03:47:22




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
I think that their are a lot these packing type gaskets used in the navy. I would think that someone in the maintence section on your base could explain this to you and show you one.(Might be on a bigger scale but the function would be the same.) Armand



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Mike CA

11-24-2007 21:25:12




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
I'll put pictures up when I get a chance.



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Mike CA

11-24-2007 18:10:21




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  

old said: On those valves there the part you turn to tun on the gas and just behind that is a packing nut. Most of the time the leak is because either that nut is loose or the packing is old/bad. I would try to tighten up the nut a little bit at a time. Don't tighten it down hard just a little bit at a time and most of the time thats all it takes


I don't think there is anything in the nut. There is supposed to be 'packing' in the nut? What is packing, and why would lack of it cause the valve to leak where it is seating?

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old

11-24-2007 19:13:01




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 18:10:21  
The packing is sort of a felt or rubber washer sort of thing. Sort of like the packet glans on a ships screw shaft. Only way you can tell it is still there is to take the valve apart and then depending on what type it is you maybe able to repalce it or you may not be able to.



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Janicholson

11-24-2007 17:43:51




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
I assumed below that the valve leaked on the inside allowing fuel to go to the carb when shut. JimN



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old

11-24-2007 17:18:50




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
On those valves there the part you turn to tun on the gas and just behind that is a packing nut. Most of the time the leak is because either that nut is loose or the packing is old/bad. I would try to tighten up the nut a little bit at a time. Don't tighten it down hard just a little bit at a time and most of the time thats all it takes

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Janicholson

11-24-2007 17:15:56




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
Dear Mike the solution is simple, and includes two steps if one fails to work, try the second.
Using a pair of pliers wit tape on the jaws to prevent marring, tighten the valve (from where it is by finger) 1/8 turn tighter with the pliers. Then turn it back and forth at that place about 10 times. This seats the needle into its seat. Do not over do this, it won't take much to wreck it.
If it still leaks, the valve and packing will need to be taken out. then a drill that fits nice down the hole is used to resurface the seat.
If there is a groove in the needle, it should be resurfaced as well. JimN

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Janicholson

11-24-2007 17:24:00




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 Re: Tricks for stoping a leaky valve? in reply to Janicholson, 11-24-2007 17:15:56  
Do not use anything but your fingers on the drill bit, and keep it straight into the hole. take only a tiny bit out, then shine a light in and look. JimN



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Mike CA

11-24-2007 17:04:13




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  

glennster said: bowl or valve leaking? ... if its the valve, try and tighten the outer nut (packing nut) a wee bit and see if it stops. in a pinch, (emergency farmer repair with incorrect parts) back the packing nut all the way out, put a couple wraps of teflon tape around the shaft and screw the packing nut back in. (i know the correct police 'll get me) p.s. dont drop the glass bowl, it breaks!!!


I don't understand that second nut. It doesn't seem to make sense of why it's there. Whether it's loose or tight, I don't see how it would affect whether gas would leak through at the tip?

I'll give the teflon tape a try, but I just don't understand that fix.

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Armand Tatro

11-24-2007 17:04:30




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
Be sure to give a slight spin to the sediment bowl as you tighten the locking nut to get the bowl to seat properly or it will leak at the gasket. You also need to do this with the oil filter canister as you tighten it or it will leak also. A farmer friend of my Dad showed me this trick years ago. Armand



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RedNeckSuperC

11-24-2007 16:38:46




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
Unless things have changed in the last year or so, the valves are not that expensive. $20 would be in the ballpark. I gave $13 for mine a couple of years ago. Ask Santa for one:)



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glennster

11-24-2007 16:31:45




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
bowl or valve leaking? if bowl gasket, remove glass bowl, be sure gasket is in straight, if its cork, you may need o replace it, be sure the sediment screen isnt in there crooked. if its the valve, try and tighten the outer nut (packing nut) a wee bit and see if it stops. in a pinch, (emergency farmer repair with incorrect parts) back the packing nut all the way out, put a couple wraps of teflon tape around the shaft and screw the packing nut back in. (i know the correct police 'll get me) p.s. dont drop the glass bowl, it breaks!!!

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Ron in Nebr

11-24-2007 16:30:12




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 Re: Tricks for stoping a leaky valve? in reply to Mike CA, 11-24-2007 16:01:55  
Mike, sometimes things just have to be replaced....but, when the money isn't there, the money isn't there. How about disconnecting the fuel line at the carb, sticking a rubber hose onto it, and simply draining the gas out of the tank into a suitable(non-leaking) gas can until the next time you're gonna need it? That'd get ya by until you can manage a new shutoff valve.



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