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John Deere 318 Needs Choke Out To Run

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10-17-2020 11:22:07

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Late model John Deere 318. My brother was mowing and started to run poorly.....pulled choke out and seemed to help in order to finish. Then started to run like too much fuel......pushed choke in and ran OK for awhile. This scenario was repeated several times. What would be some high probability things to look at or diagnose ? Thanks

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10-17-2020 13:21:35

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 Re: John Deere 318 Needs Choke Out To Run in reply to casechev, 10-17-2020 11:22:07  
I have two Onans in Wheel Horse tractors, Usually at least one of them a year will start surging really bad. I think it's from a plugged air bleed in the top of the carb. I take the air filter out and the plastic piece over carb. throat and spray carb. cleaner around the top inside of the carb, let it set awhile then blow that area out with air, keep a rag kinda covering it so you don't get a face full of gas.

You still could have some crap inside but I've had good luck with the carb. cleaner and air for a bad surging problem.

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Wore out

10-17-2020 12:01:22

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 Re: John Deere 318 Needs Choke Out To Run in reply to casechev, 10-17-2020 11:22:07  
The carburetor needs to be cleaned, a COMMON issue with the Onans, and it's a miserable job to remove the carburetor to clean t thoroughly due to all the shrouding on the engine.

Also, the intake manifold is made in two pieces and sealed together with silicone (DUMB) and they can fail over time and leak air into the fuel mixture causing a lean condition.

But from your description, the problem comes and goes, pointing to a carb issue.

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