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Thread: Onan-5500 Watt Generator-Avoid Problems

  1. Print this Post   #1
    Pug PUG's Avatar
    Join Date
    Feb 2008
    USA - ID

    Onan-5500 Watt Generator-Avoid Problems

    I have an 09 Cyclone 3950 with the Onan 5500 W generator. It has been increasiningly harder to start and got to the point it would start after many tries and then run erratically. The Onan service people said it was probably a gunked up carburator as I guess these are very touch to gumming up. They also told me that Onan only warranties the carburator for I believe 90 days. I took the carb off, dismantled, soaked overnight in carb clearner and reassembled. Helped some but not good enough. I drained the gas tank, added new fresh (non-ethanol) gas a stabilizer and an additive that is supposed to remove ethanol gummy. Still no go. I re cleaned the carb a second time and still no go. The Onan service people said it would be a new carb and labor (not covered under warranty) to the tune of $600. I had had it so I took it in and they put a new carb on. They will not clean an old one. Still no run good but better. They ended up having to pull the whole unit out of the RV thinking it was a belt that connects the motor to the generator. It was good. They found a coil that was bad and are in the process of fixing that as we talk. At least this other stuff is covered under warranty. The best advice I can offer is to buy non-ethanol gas (my Phillips 66 dealer has it) and run sta-bil and an ethanol carb cleaner additive. Most of all exercise the unit for at least a half our every two to three weeks max.[IMG]//[/IMG]
    2009 Cyclone 3950, 2011 Carriage Cameo 36fws
    2009 Dodge 3500 Dually, Cummins 6.7, Isspro Guages, TST TPMS system, Aux Fuel Tank, CB
    Honda Shadow 1100
    Yamaha 660 Grizzly
    Catalina 26 Yaght

  2. Print this Post   #2
    Moderator jimtoo's Avatar
    Join Date
    Jan 2006
    USA - TX

    Having run a shop for many years, they misdiagnosed the problem. I would ask them to reinstall your old carburetor and give it a try (while you are there and can witness it). I really don't think you would have two problems causing the same thing. If you cleaned your carb ,, you should be good to go.

    My 2 cents.

    Jim M
    Jim and Bette
    04 GMC CC Dually D/A, MaxBrake, Riderights
    09 Bighorn 3670RL #9E011439
    Disc Brakes
    HOC #1003
    Heartland Owners Club Information

  3. Print this Post   #3
    Senior Member caissiel's Avatar
    Join Date
    Aug 2009
    CAN - NB

    I use 2 Cycle oil in my lawntractor occasionaly to prevent any sticking of the fuel passages, could this help with ethenol gas to.
    Barbara and Laurent, Retired teacher and maintenance/engineering,Full Timing
    Mods: Hydraulic selector valves, Queen bed, heavier front closet rod, W/D door swing changed, 2" rear hitch. 2" pin box hitch.Added build in water filter, Replaced HW Tank Fittings. Modified 2 ceiling vents. Relocated shocks to 60deg. 9/16" U-bolts and spring plates.Center 7500 lbs Scissor Stabilizer Jacks. Hawkshead TPMS. Reinforced kitchen sink supports.More supports and longer rails to couch drawer. Modified bedroom steps for storage. Modified landing gear jacks, etc.
    2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Use ScangaugeII for Economy, available 60 XGauges and Scanner, Fuel Pressure Gauge, Max Energy by Hypertech set at 85HP for cooling, torque and economy. ELC Coolant and Filter and EGR cooler deleted. 2 added 1300lbs each spring plies, Fuel mileage 21 MPusG empty, 12.6 MPusG pulling the BC. 6.2" din2 touch screen car Radio with DVD, TV, CD,SD,USB, GPS and Rear Cam,

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