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Thread: Onan 5500 Problems

  1. Print this Post   #21
    Junior Member
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    Re: Onan 5500 Problems

    Quote Originally Posted by TerribleTim68 View Post
    Okay guys, new problem.

    I put a new carb on it and it fired up. Ran it for about 10 minutes, no problems at all. Shut it down and now it won't fire back up. It will light off, but as soon as you turn loose of the start button it dies.
    Edit - Okay, I let it sit for 10-15 minutes and it fired back up. Is it possible this thing is flooding itself out when it shuts down?

    Thoughts?

    Did it kick any codes?

    - - - Updated - - -

    Quote Originally Posted by TerribleTim68 View Post
    Yeah, I'd love to see some pics of the housing mod, just as general FYI.
    Here you go, I have a video if you want to see it, PM me and I will try to send it to you that way.
    Attached Images Attached Images

  2. Print this Post   #22

    Re: Onan 5500 Problems

    No clue on the codes. Don't know where to look for them, or have anything that would read them if it did.

    Anyways, the end result was, with the new Chinese carb from the Amazonians it ran all day long on Thursday, probably about 8 hours, then fired up again Friday and ran for another 12 hours, then fired up again Saturday and ran for another solid 10 hours, then fired up again Sunday and ran for a solid 7 hours. All of that was with a fairly heavy load on it in some form of either the AC running non-stop, me running a commercial smoker, me running a commercial cook-and-hold oven or some combo of those items at the same time. Basically I turned it into a giant mobile catering rig while running the AC. I had to feed about 30 volunteers for 4 days.

    I still have no clue how big that fuel tank is, but it was full when we started this adventure, I dumped another 5 gallons in it Friday and it was down to just above a 1/4 tank when I shut it down Sunday afternoon. I call it a success. Now here's to hoping I don't need to replace the carb every season.

    Oh, the one thing I did notice was that every morning when I tried to start it, it would do that thing where it starts and immediately dies. You'd do that a couple three times, then let it sit for 5 minutes or so and then try again and it would fire right up. And it still wouldn't fire up right after being shut down. I'm really leaning toward it flooding itself on shut-down. But no clue on the first startup each morning.

    2003 Dodge Ram 2500 5.9L Diesel
    2008 Heartland Cyclone 4012
    Couple Harleys for once the wife & I get parked.

  3. Print this Post   #23
    Senior Member avvidclif's Avatar
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    Re: Onan 5500 Problems

    When cold starting mine I use the prime button several times before starting and it doesn't have any problems.
    Clif KA5IPF Retired
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  4. Print this Post   #24

    Re: Onan 5500 Problems

    Quote Originally Posted by avvidclif View Post
    When cold starting mine I use the prime button several times before starting and it doesn't have any problems.
    Yeah, it didn't seem to matter if I primed it first or not. It still did the same thing. I just figured "okay fine, do this procedure, then let it sit for 5-10 minutes and try again", worked every time so I just went with it. Sometimes you have to let the thing tell you how it will work and just accept it.

    2003 Dodge Ram 2500 5.9L Diesel
    2008 Heartland Cyclone 4012
    Couple Harleys for once the wife & I get parked.

  5. Print this Post   #25
    August 29, 2018 porthole's Avatar
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    Re: Onan 5500 Problems

    Quote Originally Posted by TerribleTim68 View Post
    Hey guys,
    Figured I'd better fire up the generator before our big outing this week. Wouldn't you know it, it won't run.


    Did you see my link for the Onan run problems and possible solutions?

    Link below.

    I also have genuine Onan parts listed in the for sale section. 2 of those parts are a carb and the fuel solenoid.
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  6. Print this Post   #26

    Re: Onan 5500 Problems

    Quote Originally Posted by porthole View Post
    Did you see my link for the Onan run problems and possible solutions?

    Link below...
    Thanks Porthole, interesting read.

    2003 Dodge Ram 2500 5.9L Diesel
    2008 Heartland Cyclone 4012
    Couple Harleys for once the wife & I get parked.

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