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Old 04-23-2015, 12:55 PM   #1
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Generator Carb Varnished

Looks like my carb is gummed-up. For a million different reasons we weren't able to get to our coach in storage for about 4+ months. After priming it, the generator will start but shuts-down after a few seconds. Fault code is fuel related. Will do some diagnostics to rule out fuel filter and pump this weekend. Does anyone have any experience with trying to clean these carbs? Any chance with filling the bowl with cleaner, running it through, and repeating? Or does it need to be rebuilt?
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Old 04-23-2015, 01:45 PM   #2
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Save yourself some time and buy a new carb. These are not designed to be torn down and cleaned or rebuilt. You can try it but don't get your hopes up. Been there done that. Your low speed jet is clogged. SEE BELOW


One thing I would highly recommend is to install a simple inline shut-off valve in the fuel line (if your fuel is gas) and always turn the fuel off and let it run until it shuts off. This is really important if you don't run the genset regularly, otherwise the gas in the carburator will probably gum up and cause issues. Also make sure you add Stabil fuel additive to the gas, this will help prevent the fuel from deteriating after setting for real long periods of time.
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Old 04-23-2015, 02:50 PM   #3
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You can thank the ethanol in the fuel for that.
This is why I only use Chevron 94 with no ethanol.
From bikes that I have bought with gummed up carbs, I can say that the only way to get them clean is to remove the jets and use a piece of fine wire to scrape the goo out of the jets.
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Old 04-23-2015, 02:56 PM   #4
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Originally Posted by rodandmir View Post
I can say that the only way to get them clean is to remove the jets and use a piece of fine wire to scrape the goo out of the jets.
Being a 2012 the carb is probably sealed (thanks to CALIF) so as TexasRT said plan on buying a new one.
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Old 04-23-2015, 03:47 PM   #5
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My service center is quoting me +/-$250 to rebuild the carb. Now you all have me wondering if that is even worth it.
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Old 04-23-2015, 03:57 PM   #6
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An inline fuel valve would be a great idea. ethanol is evil!
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Old 04-23-2015, 04:03 PM   #7
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All my power equipment now only gets non ethanol gas. Costs about 80 cents more a gallon but well worth it. Also use the marine grade Sta-Bil.
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Old 04-23-2015, 04:05 PM   #8
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My service center is quoting me +/-$250 to rebuild the carb. Now you all have me wondering if that is even worth it.
If I remember correctly, I payed about that or a little less for a brand new carb from a RV supply house. For some reason $230 comes to mind. It literally take about 30 mins to replace. I would personally buy a new one for that price. Maybe yours is different than mine, mine was a 2005 model genset. The carb I bought last year was a carbon copy of the original, only difference was the gas line hookup tube.
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Old 04-23-2015, 04:13 PM   #9
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Thanks Texas. What about readjusting it? The service manual describes a method that requires a load bank and adjusting the rpm based on hertz. Do you recall the name of the store you purchased yours?

Thanks all. I know I should have put a stabilizer in the tank, but I never intended for it to sit so long.
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Old 04-23-2015, 04:22 PM   #10
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What about readjusting it? The service manual describes a method that requires a load bank and adjusting the rpm based on hertz.
No need for that if it's just a bad carb. The new carb is preset, bolt it on hookup excactly like the old one and you're done. The setting your referring to is if you have other issues. If it was running fine before it sat with gas in it and gummed up, a carb will fix it.
The only difference in my old carb and the new one was my original had an inline filter at the gas line hookup and one underneath the genset. The new one didn't have the one on the carb itself. My parts guy called Onan and they said they eleminated the extra filter. It will work, have faith. LOL


Edited - The store was PPL RV in Houston
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