| Onan Carb Problem [message #215595] |
Wed, 24 July 2013 18:43  |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
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Senior Member |
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Bamboozeled by the Barbarian
I noticed that my carb was flooding and was able to verify this by holding the prime switch on with the engine off. So I did a visual check of the carb, tightened everything up and retried it. No joy. So I took off the bowl so I could see the float and needle valve, turned the carb upside down so the weight of the float was holding the needle valve in the closed position, coated everything in the bowl area liberally with bubble solution and pressurized the fuel intake with air. No bubbles. Hmmm. I'm out of ideas. Anyone else solved a similar problem or have other ideas?
Other points:
The generator runs
The float is adjusted per the spec
The carb is clean
The float isn't full of liquid
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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| Re: Onan Carb Problem [message #215598 is a reply to message #215595] |
Wed, 24 July 2013 21:08  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| captjack wrote on Wed, 24 July 2013 19:43 |
Bamboozeled by the Barbarian
I noticed that my carb was flooding and was able to verify this by holding the prime switch on with the engine off. So I did a visual check of the carb, tightened everything up and retried it. No joy. So I took off the bowl so I could see the float and needle valve, turned the carb upside down so the weight of the float was holding the needle valve in the closed position, coated everything in the bowl area liberally with bubble solution and pressurized the fuel intake with air. No bubbles. Hmmm. I'm out of ideas. Anyone else solved a similar problem or have other ideas?
Other points:
The generator runs
The float is adjusted per the spec
The carb is clean
The float isn't full of liquid
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Jack,
My interpretation of what you are saying is that if you run the fuel pump with the engine still, fuel runs out of the carburetor. Is this correct?
Your test did not exclude a leaking needle and seat unless you put liquid around the needle and that is very difficult.
There could also be a leak or porosity in the area of the seat that is hidden under the pivot.
How did you determine that the float is not flooded?
Don't bother shaking it, you will never hear or feel the slosh.
Put the float in a small container of gasoline, it should bob like a cork. It is a ring float, see if it will tip away from the pivot and stay that way. If yes, it's flooded.
Do you still have the original Bendix/Facet pump?
Has anybody messed with it?
Good Luck
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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