Onan 4000 not wanting to stay running
Hey you all,here I am again. I have the Onan 4000 generator and it wants to die on me when I get it going and roams up and down before dying. If I wedge something in by the governor to keep it from ...
Forum Discussion
I'm not a tech, but based on my experience with carb and surging problems on two 4KW ONAN genny's (a 4KY like you have and an older BFA):
In both cases the carburetor required repair/rebuild/replacement.
I also think:
Governor adjustment is a possibility but a thin chance. I'm trying to resist saying I think you're kidding yourself...
You need a higher concentration of Seafoam or other carb cleaner than you can achieve in your main tank. Those of us doing that treatment hook up a small tank with a very high concentration in it and run the genny on that.
I've also heard of taking the fuel line to the carb off, filling it with straight Seafoam. Start the genny, let it idle a few seconds, shut it off for half an hour. Repeat, Repeat, Repeat... The idea is to work the Seafoam into the genny carb's VERY small passages and let it soak there.
Spraying a cleaner into the carb throat does very little. You need to clean where the gas is dispensed INTO the carb throat. All those tiny passages...
In both cases the carburetor required repair/rebuild/replacement.
I also think:
Governor adjustment is a possibility but a thin chance. I'm trying to resist saying I think you're kidding yourself...
You need a higher concentration of Seafoam or other carb cleaner than you can achieve in your main tank. Those of us doing that treatment hook up a small tank with a very high concentration in it and run the genny on that.
I've also heard of taking the fuel line to the carb off, filling it with straight Seafoam. Start the genny, let it idle a few seconds, shut it off for half an hour. Repeat, Repeat, Repeat... The idea is to work the Seafoam into the genny carb's VERY small passages and let it soak there.
Spraying a cleaner into the carb throat does very little. You need to clean where the gas is dispensed INTO the carb throat. All those tiny passages...
