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Subject: Shutoff valve

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Frank (WNY)    Posted 05-17-2020 at 09:51:38 [URL] [DELETE]        [Reply] [Email]  
  • Shutoff valve
  • Last fall, my 50 8N was dripping gas from where the fuel line goes into the right filter screen on the carb. The knob on the shutoff was closed tight. I disconnected the fuel line from the filter and saw a steady drip, about 1 every 5 seconds. I drained the tank and tried cleaning the valve with no success. I just replaced the whole sediment/valve assembly with a new one from Just 8Nís and applied Gasoila. It sat for about a week. I started to put the bowl on and touched the hole on the bottom of the assembly and felt a drop of gas. The tank was still drained and the knob was closed. I havenít tried to put any gas in the tank yet. The valve I replaced was also new from Just 8Nís and installed about 3 years ago. Anybody else have problems with the quality of these valves?

    Gary in GA    Posted 05-23-2020 at 23:14:01 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Shutoff valve
  • I have the same problem. My original had so much corrosion in it I couldn't clean it. Seems the metal over the years deteriorated and blocked up the assembly. I opted to buy one from Steiner. The new one works just fine except for a leak where the glass bowl inserts into the valve body. No matter how much I tighten the thumb wheel it leaks. Apparently the cork gaskets these days are not like the originals. I need to find a way to seal it better before I have a fire on my hands. Open to suggestions....

    g    Posted 05-22-2020 at 18:31:45 [URL] [DELETE]        [Reply] [Email]  
  • Re: Shutoff valve
  • Like you, my gas shut-off valve leaked. I had it replaced with the China one which also leaked out of the box. I went to Ford-New Holland and requested a new USA made valve. Took them several days to chase down, cost much more but works perfect. I was so happy I ordered a second for when my Grandkids inherit the 641 and need to replace it. Just looking at the 2 valves you can see a big difference in workmanship. Gary

    Frank (WNY)    Posted 05-23-2020 at 08:27:41 [URL] [DELETE]        [Reply] [Email]  
  • Re: Shutoff valve
  • Thanks for the information, Gary. Could you let me know if it was leaking through the valve (from the tank into the sediment bowl) or around the stem near the knob? It seems like the end of the stem doesnít make full contact with the seat on mine.

    Gary in GA    Posted 05-24-2020 at 08:30:28 [URL] [DELETE]        [Reply] [Email]  
  • Re: Shutoff valve
  • As far as I can tell, the fuel is leaking from between the glass bowl and the gasket. I have cranked that sucker down and the leak seems to get worse. Iím thinking of using a liquid gasket material on both sides of the cork to see if that works. This is such a simple device I donít see how you mess up the reproduction of it. If the Chinese cannot make acceptable reproductions of these parts, itís no wonder their buildings fall down.

    Frank (WNY)    Posted 05-24-2020 at 11:05:00 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Shutoff valve
  • Everything around the bowl assembly was tight and no external leakage. I wouldnít have found the leakage through the valve if I hadnít seen it dripping around the fuel line flare fitting going into the carb fuel filter. Luckily I had just cleaned and rebuilt the carb so it wasnít flowing into the engine.

    Frank (WNY)    Posted 05-23-2020 at 08:38:26 [URL] [DELETE]        [Reply] [Email]  
  • Re: Shutoff valve
  • Also, was the leaking valve a Sparex brand? They have a 1 year warranty.

    Frank (WNY)    Posted 05-17-2020 at 16:18:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: Shutoff valve
  • I did a quick search and found a blog from 3 years ago about this problem. Here is the website: https://syonyk.blogspot.com/2017/12/ford-n-series-sediment-bowls-suck.html The reason he gives makes sense to me because I can see the wear mark on my old one only goes halfway around. Not to sure about the fix he gives. It sounds like when you buy one it is a hit or miss proposition of getting one that seals properly.

    Tim Daley(MI)    Posted 05-17-2020 at 11:08:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Shutoff valve
  • HiYa Frank-
    I haven't had issues with Just8N's or Carpenter parts but did have issues with a Sediment Bulb and two Valve Stems I got from that popular "tractor supply" place in town next to McDonalds. The Bulb had mucked up NPT threads on it and it did a number on the gas tank, but I was able to repair and used a lot of Gasoila doing it. The valve stems used vinyl for the internal seal -supposed to be oil and gas resistant rubber, and leaked. I'd determine if the leaking is coming from the valve stem or from the brass elbow inlet on the carb. You probably already know this, but all the threads on the fuel line are a special thread size, made for brake, fuel, and oil lines only at 7/16-24 UNS. If the Bulb fuel valve stem inlet and/or the fuel line outlet, or the brass elbow gets cross threaded or chased with the wrong size tap, you'll never fix that and leaking will be prevalent. So, to test the valve, pull fuel line off the brass elbow and slide off to a container. Open knob 2 Full Turns. Observe stem to see if leaking is from there. YES? Ensure the stem is seated correctly. Always hand start threads and screw in as far as it will go before tightening with a 7/16 flare nut wrench -never use pliers, channel locks, or a crescent wrench -those will round off the hex nut. Open and close the valve a few times and feel tightness of unit before final sequence. If not leaking there, then it has to be in the brass elbow. The elbow has an NPT male thread on it and the carb has a female NPT thread. Often fellas don't know this and try to chase it with a standard tap and end up crossthreading it. Likewise, the female port accepts the 7/16-24 fuel line thread and can be boogered up as well. Once leak is stopped, put a dab of thread locking goop on the small 8-32 screw that secures the Valve Stem/Bulb knob on with. This ensures the knob won't fall off in use. You don't realize it fell off until you get back to the barn and go to kill the fuel. Always kill/shut off fuel valve when not in use. See if this helps -post back.




    Tim Daley(MI)

    Frank (WNY)    Posted 05-17-2020 at 13:14:14 [URL] [DELETE]        [Reply] [Email]  
  • Re: Shutoff valve
  • Thanks for the response Tim, The fuel line that came with the tractor was kinda beat up and I had to tighten it down at the inlet to the carb a few Timís whenever I put it back on To make it stop leaking there. I have a new one that I am going use once I get.the valve leak solved. The stem on the valve I took off and the new one are tapered at the end. The picture you attached is the same as the picture on Just 8Nís with a flat tip. The seat in the valve is beveled to mate with tapered tip on the new one. Right now I have the valve assembly threaded in with cured sealant. I donít see any gas around the bottom of tank. The fuel line and bowl are not installed. There is a little residual gas in the tank. Nothing is dripping, but you will get your fingers wet with gas if you feel around the hole in the middle of the screen. This is with the valve closed. I think I will connect the new fuel line to the valve, install the bowl, and put gas in the tank and see what happens...

    Bruce(OR)    Posted 05-17-2020 at 10:59:50 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Shutoff valve
  • Email sent.

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