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John Deere Tractors Discussion Forum
:

Deere B Float, Flooding

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Steve in IL

06-10-2021 19:08:33




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I wanted to pass this by the experts, to ensure that Ive got this right... Friends Model B runs good, as long as the gas petcock (on the fuel bowl) is turned off (runs until fuel runs out). If you turn on the fuel, it will start (after a few seconds) making black smoke and missing, until it dies. Removing the plugs at this point, the cylinders will be wet with raw fuel.

Thinking its a float issue. it has to do with the float allowing too much fuel in. Could be: 1. Float height setting, 2. Non-floating float (hole), or 3. poor needle valve sealing.

Folks , based on your experience, what do you think? Any suggestions are welcome

Thanks.

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Maw7989

06-11-2021 18:40:52




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:08:33  
Pull bowl off, turn gas on and move float up to test the needle and seat. Adjust it down according to book.



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teddy52food

06-12-2021 06:40:42




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 Re: Deere B Float, Flooding in reply to Maw7989, 06-11-2021 18:40:52  
Most times the float has a hole & gas in it.



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David from Kansas

06-11-2021 06:54:12




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:08:33  
Had the exact same thing happen on my '36 JD A. The float had a pin hole and was leaking.



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John T

06-11-2021 04:22:35




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:08:33  
I agree with the other gents, its EITHER the needle valve is failing to rise and close off gas due to rust, corrosion, crud, gum n varnish orrrrrrrrr The float has a leak and is full of gas so its not rising/floating to close off the needle valve orrrrrrrrrrr the float level is set wayyyyyyyyy to high

John T



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Lon in NE

06-10-2021 20:36:09




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:08:33  
Put some really hot water in a pan. Submerge float. If you see bubbles, you've go a leak. Replace float.



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greenmech

06-10-2021 20:19:10




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:08:33  
Take the bowl off and check the float, if it has gas in it replace it. Could be dirt in the seat. Ron MN



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old

06-10-2021 19:30:21




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:08:33  
Good chance it has to do with the float and or needle seat/needle. #1 could be dirt/rust in the seat so the needle cannot stop fuel flow.
#2 bad float and it needs to be replaced. #3 sticking float due to rust or a float that has been messed with incorrectly.

So what is the back story?? Did this just happen out of the clear blue or has he had the carb opened up



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Steve in IL

06-10-2021 19:44:45




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 Re: Deere B Float, Flooding in reply to old, 06-10-2021 19:30:21  
Tractor has been sitting in a barn for 13+ years. Fuel system wasnt too bad, but theres likely debris in the system. When this condition started, we took the carb apart.... it wasnt bad, but I didnt perhaps pay enough attention to the float/needle valve.



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old

06-10-2021 19:51:15




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 Re: Deere B Float, Flooding in reply to Steve in IL, 06-10-2021 19:44:45  
Any dents in the float?? If yes the float is bad



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