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Old 07-01-2009, 08:26 PM   #1
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Removing carburator off a 4000 onan

unit will not stay running after 5 seconds of starting even if I keep the start switch down. I have plenty gas going into the carb and I removed the spark plug and grounded to frame it has a good spark. So I decided to remove the carburator but can't see the two bolts that hold it to the intake because of the plastic that holds the air filter. Does anyone know the size of the bolt head? I did fill the gas tank to half full and replace the battery.
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Old 07-01-2009, 08:43 PM   #2
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Location: Florida Keys
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Does your start switch flash a code (check manual). I had the same symptoms and it turned out a mouse had chewed through some of the wires that you can't see from the front.

Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 19 years & 150,000+ miles
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Old 07-05-2009, 08:56 AM   #3
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Fiash code

Called Onan company and they said that the Microlite doesn't have the flash code system. Removed the carburetor bowl and found the float stuck in the open position. Got the float to move up and down, reconnected the carburetor and restarted but have to manualy move the choke to get it to start and runs for about 20 seconds. I guess it's time for a new carburetor..
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