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Old 07-18-2016, 09:17 PM   #15
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I agree with the fuel being the problem. I'm sure the fuel as gone bad and turned into tarnish. A complete clean of the fuel system will be required. Take the gas cap off and smell, if it smells like varnish, its bad. Tank will need to be cleaned also. Had this happen to me on a old tractor. Fuel got so bad it would not gravity feed from tank to filter bowl. Had to take the tank off and use fuel tank cleaner to remove all the tarnish. Plus, I'm sure some rust has built up from just sitting. The tank cleaner will remove this also. Good luck.

2005 Damon Daybreak 3070 Workhorse P32 8.1 eng
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Old 07-18-2016, 09:20 PM   #16
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Originally Posted by jelag View Post
In all the small engines I've worked on... removing the float bowl will expose the main jet.. its a simple task to check the material in the bottom of the bowl and spraying any number of chemicals that will dissolve the varnish that has built up, and with installation will usually allow it to start and run...

In all my small engines I use Sta-bil either in the can before I pour it into the tank or as added to the tank directly...

I'm sure you'll end up pulling out the plug and cleaning it as well...

Hope this helps...
I agree with everything you said! I don't know why people are afraid of carburetors.

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Old 07-18-2016, 10:26 PM   #17
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Never had to worry about that with my Propane Onan. It always started without hesitation each spring for over 14 years. Now I have all kinds of things to maintain with a water cooled diesel - I need to learn up.
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Old 07-19-2016, 04:15 AM   #18
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Not sure how close these are but I had the same problem with my Onan in my 82 PA after purchase. I replaced the pump also but turns out it was and still is the choke. It is electric and heats up the carb. I have had it into Cummins/Onan a few times and they still can't get it right. I have to hold the butterfly to the off position and hold it for about a minute, it then runs like a top.
See forum,

Electric Choke on the 1982 6.5 Onan Gennie date 1/13/15
Hope this helps,
1982 Pace Arrow 30ft.
KarKaddy SS, Toad: 1999 Deville Concours
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Old 07-19-2016, 11:19 AM   #19
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I just went through a similar ordeal on ours. a 97 Pace Arrow with an Onan 5000 Marquis. The genset only has ~620 hours on it, so barely used. The genset is a "post emissions" unit with a sealed throttle. There is NO adjustment for the throttle, it is all automatic. It had sat unused for years with the previous owners who always used the shore power. It started out not running at all. We took it apart, cleaned it, replaced the filter, seafoamed it etc and got it to at least start. Once it did start, it would run very rich and smokey and eventually die after a few minutes. Took it apart several more times, worked on the choke, etc. Could not get it to run properly at all.

I ended up just buying a new carb as the newer (post 96/97 or so) carbs are "not serviceable". I think I paid about $300 for it and ended up being a better solution in the long run for my gen set. The reasoning behind it is that the new emissions carbs have too many tiny air and fuel passages to ever get fully clean once they get gummed up.

Good luck with it!
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Old 07-19-2016, 01:48 PM   #20
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I have an Onan 4000 GenSet BGE I would appreciate it if you have one that covers this, or let me know where i could down load. thanks
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Old 07-20-2016, 01:51 AM   #21
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Ah, one point nobody mentioned, and I'm sure thou looked at it, butt do you have enough gas in the main tank of your RV? The fuel pickup in the main tank is usually placed so it sucks air if the tank has 1/3 or less.

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