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Thread: Onan 5500 will not stay running.

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    Junior Member
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    Onan 5500 will not stay running.

    Used my generator one time since I bought my 3850 in March and it quit after 20 minutes. Fuel pumping okay, oil okay. I am getting a code 1-12 on this which when looked up instructs me to go to the Onan dealer. Trying to save time with any known fixes or issues that you all may have. By the way, it fires up and shuts down within two seconds. If I manually hold the choke open along with the throttle, it will run for 15 seconds or so.

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    Pug PUG's Avatar
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    Re: Onan 5500 will not stay running.

    I had a 5500 in a 3950 I just sold and had kind of a similar experience. I always exercised my unit every 30 days and kept gas additive in it to keep the fuel from going bad. Also if you run ethanol gas it can plug up your carb but there is a ethanol additive to keep this from happening. One day my unit would start and then quit and start and quit. I cleaned the carb to no avail. Finally to it to a Cummins Onan dealer and they put a new carb in. Still not fixed. They pulled the unit out and found some kind of a spring clear down underneath it that had broken. They replaced that and presto it ran again.
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    Saskatchewan Chapter Leader Chainsaw's Avatar
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    Re: Onan 5500 will not stay running.

    If it is gas I can't help you as the problems with mine were propane. Is it gas?
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    Re: Onan 5500 will not stay running.

    It does sound like a fuel problem. The one thing I can offer is that ours acted like this with about 7 gallons in the tank, although I didn't get a code (actually, I don't know how to get or find a code...). I filled the tank and it immediately started and ran.
    I need to take Pug's advice and get some additive and run it routinely.

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    Senior Member ultrafarmer's Avatar
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    Re: Onan 5500 will not stay running.

    I have to open the door to the gen if it is hot out. It overheats and shuts down.
    <img src=http://www.heartlandowners.org/forum/images/smilies/cool.png border=0 alt= title=Cool class=inlineimg />2008 Ram 3500 pulling a Cyclone 3210 perfect combo,, I also throw a 2005 Heritage Softail in the back.

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    Northern Virginia newbie's Avatar
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    Re: Onan 5500 will not stay running.

    As a couple others have asked, it this a gasoline or propane generator?

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    Re: Onan 5500 will not stay running.

    I agree that you should run the unit about once a month to keep it happy... Since you haven't run it since March. Get rid of the fuel and put fresh in the onboard tank... Ethanol has made it where the fuel needs to be replaced ever 3 months if you don't put in fuel additive to keep it from going bad.
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  8. Print this Post   #8
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    Re: Onan 5500 will not stay running.

    It is gas and other then running it every month for a few minutes it ran fine to this point. It was a hot day and the gas was fresh as I had never topped the tank until then. I will get it to the dealer and see what they can find.

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    August 29, 2018 porthole's Avatar
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    Re: Onan 5500 will not stay running.

    Quote Originally Posted by timsitis View Post
    other then running it every month for a few minutes
    This not the best way to "exercise" a genny.

    Once a month is good, but you should let it warm up a few minutes, start adding loads up to at least half capacity, maybe 3/4 capacity. Let it run 15-20 minutes then remove all the loads and let it run unloaded for about 5 minutes.

    Sta-bil in the fuel too. I add Sta-bil every time I add fuel to the tank, whether we are using it or not.
    Last edited by porthole; 07-20-2011 at 03:06 PM.
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    Senior Member Wmnmy's Avatar
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    Re: Onan 5500 will not stay running.

    I had the same problem mine kept cutting off I found out if I have a quarter tank of fuel it won't run filled it up and it ran like a champ in 110 weather it got hot so I opened the main door no problems since

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