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John Deere Tractors Discussion Forum
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Fuel shutoff question

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John from Minn

10-24-2007 12:34:50




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Can I replace the diaphram in my sediment bowl on my 50 without draining the gas tank? Also, if the diaphram is leaking now and I turn the fuel off with the shutoff valve on the sediment bowl, will gas still leak into the crankcase? Thanks!




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John T PS

10-24-2007 15:37:12




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 Re: Fuel shutoff question in reply to John from Minn, 10-24-2007 12:34:50  
If you have the auto shut off type sediemnt bowl assembly it has small copper/brass lookin oil lines to a brass lookin T on its side with one lil line up to the oil pressure gauge n the other to the engine. On those you can unscrew a lil knurled nut on top and depress it (same as oil presure pushing diaphram down) to override the shut off so gas can fill the bowl to get it started if shes dry and then when finished screw it back out to close off any dirt etc gettin in. If its the auto shut off it has the lil knurled nut on top and the oil lines and usually NOT any other manual screw in sut off valve.

If theres no oll lines to it but a manual shut off its NOT the auto shut off type.

You have to remove it to replace the 2 rubber diaphrams and be sure n get the lil convex shaped center down the same way it came off. I always replace the lil rubber O ring washer on the vertical plunger assembly which actally turns the gas off n on.

John T

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Mike M

10-24-2007 13:24:59




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 Re: Fuel shutoff question in reply to John from Minn, 10-24-2007 12:34:50  
To change the diaphram you will need to drain out the gas and remove the whole assy. from the tank otherwise I don't think you can get at the screws. If you have the diaphram type shut off there is no manual shut off on them ? And yes if just sitting there with engine off they can leak back into the engine in time. Scribe mark the housing sections before taking them apart and put it all back the same way. I also start all the screws and then push down on the top center plunger while tightening the screws to prestrech/preload the diaphrams.

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John from Minn

10-24-2007 13:35:25




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 Re: Fuel shutoff question in reply to Mike M, 10-24-2007 13:24:59  
Thank you. I am a bit confused though. I will need to check out my tractor better. According to the serial number it should have the automatic shutoff. I just bought it on Saturday and it was out of fuel. The sellers dad told me it should have the auto shutoff so we needed to squirt some gas into the spark plug opening and run the tractor that way long enough to get the oil pressure up high enough to allow the fuel to flow to the carb again. On the other hand, I do for sure have a manual shut off on the side of the top of the sediment bowl just like I had on my '48 B and it does shut off the gas when screwed in all the way. What do I have? Would someone have replaced the sediment bowl with the old style?

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Mike M

10-24-2007 20:13:52




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 Re: Fuel shutoff question in reply to John from Minn, 10-24-2007 13:35:25  
I think the early model 50 tractors had a manual shutoff. Some were likely updated to the auto type. And I bet some auto types were changed over to the manual type too.



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