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John Deere Tractors Discussion Forum
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39 A Gas in Cylinders

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AllanR

03-17-2007 13:29:36




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Today I went to start my tractor and the cylinders were half full of gas. The gas tank was empty. When opened the shut off valve for the gas, it was not closed tight, allowing the gas to seep through. I checked to see if the float in the carb was stuck, it was free by the time I got the bottom off of the carb the float was free. The tractor ran fine after getting all the gas out and changing the oil and filter. I always close the gas valve to turn it off, and never saw this before, having the tractor 30 years. Could this be an indication that the float may have a hole in it to cause this.

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flying belgian

03-18-2007 05:38:06




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 Re: 39 A Gas in Cylinders in reply to AllanR, 03-17-2007 13:29:36  
same problem with our 36 B. hole in carb float. "The float had sunk"



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Steve Crum

03-17-2007 16:31:16




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 Re: 39 A Gas in Cylinders in reply to AllanR, 03-17-2007 13:29:36  
I had to replace the sediment bowl/shutoff assembly on my 44' A. Seems after 62 years, the seat of the shutoff was corroded and pitted enough that no matter how tight you closed it, it would still leak gas by. Don't expect a positive seal on the needle and seat either. Especially with the Chinese rebuild kits.



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AllanR

03-17-2007 16:38:56




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 Re: 39 A Gas in Cylinders in reply to Steve Crum, 03-17-2007 16:31:16  
The sediment bowl shutoff is not to old maybe 5 years. But it could still be bad. I have never changed the needle and seat though. Thanks Steve.



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Duane Larson

03-17-2007 14:09:54




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 Re: 39 A Gas in Cylinders in reply to AllanR, 03-17-2007 13:29:36  
AllanR,
If your float was bad, ie, with a hole in it, it would likely have been full of fuel and the tractor would not have run well after you got it started. My guess is there is a slow leak in the needle/seat, and that allowed the fuel tank to empty when the fuel shutoff was not tight. Before doing anything, I would run the tractor, shut it off by turning off the fuel, and when it stops, put a can under the carb bowl drain and open the drain. Some remaining gas will drain out - dump that and put the can back under the bowl drain. Make sure the fuel shutoff is closed, and watch the can to see if any fuel is leaking through the carb bowl. That test will indicate if you have developed a new problem - if no fuel in the can, your shutoff is working and you are back to normal. There is in principle a "double shutoff" to keep fuel from flowing into the cylinders - the first stop is the fuel shutoff and the second is the needle/seat/float combination.

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AllanR

03-17-2007 16:34:16




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 Re: 39 A Gas in Cylinders in reply to Duane Larson, 03-17-2007 14:09:54  
Thank you Duane.



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