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Open Roads Forum  >  Tech Issues

 > Onan gas generator want start

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bennefim

Daleville, AL

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Posted: 09/07/19 06:32pm Link  |  Quote  |  Print  |  Notify Moderator

Battery/starter turns over good. Full tank of gas. What should I check?

MDKMDK

Canada

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Posted: 09/07/19 07:19pm Link  |  Quote  |  Print  |  Notify Moderator

Oil level. They shut off if it gets too low.


Mike.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)

DFord

Near St Louis, MO

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Posted: 09/07/19 07:51pm Link  |  Quote  |  Print  |  Notify Moderator

After you've held in the stop button a couple of times till the light goes out, try draining the fuel bowl on the carburetor to see if it's full meaning the generator is getting gas. If it's not buy enough gas line to go from the fuel pump inlet to a gas can and see if you can get some gas into the fuel bowl. If you've got spark, fuel and compression it should start.


Don Ford
2004 Safari Trek 31SBD (F53/V10 20,500GVW)
'09 HHR 2LT or '97 Aerostar MiniVan (Remco driveshaft disconnect) for Towed vehicles
BlueOx Aventa II Towbar - ReadyBrake Inertia Brake System


maillemaker

office

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Posted: 09/09/19 08:10am Link  |  Quote  |  Print  |  Notify Moderator

https://www.smokstak.com/forum/forumdisplay.php?f=1


1990 Winnebago Warrior. "She may not look like much but she's got it where it counts!"



camperdave

northern, California

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Posted: 09/09/19 08:32am Link  |  Quote  |  Print  |  Notify Moderator

How about a little history. Did it used to run? How long ago? Could be a clogged carb, could be something else.


2004 Fleetwood Tioga 29v

lane hog

Tucson, AZ & NW Chicago Burbs, IL

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Posted: 09/11/19 05:27am Link  |  Quote  |  Print  |  Notify Moderator

When's the last time you ran it, and do you have a fuel cutoff or drain your float bowl?...



  • 2005 Winnebago "Minnie" 31C (was a three-time Jayco owner)
  • 2012 MasterTow Dolly pulling a 2003 Jeep Liberty (had Ram 2500 CTD, Dodge Durango, Honda Odyssey...)
  • Onan Microquiet 4000, plus 130W solar and Honda EU2000i twins for backup



MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 09/11/19 04:00pm Link  |  Quote  |  Print  |  Notify Moderator

"My car doesn't run right"

What's that? What's that? you ask?

Oh by the way (after lots of demands for further info) "It's an electric car".


Without added information a question is worthless. Brand and model number of unit.

Doctor! Doctor! I don't feel well. Tell me why.

bounder39zman

SC

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Posted: 09/11/19 06:33pm Link  |  Quote  |  Print  |  Notify Moderator

yes...as above post states; how about a model/spec./ser no.?
Back to basics; if internal combustion engine has air/fuel, compression, spark (at right time) then should run. have to determine what is missing. check fuel to carb, spark at plug, etc.

DFord

Near St Louis, MO

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Posted: 09/11/19 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

I think the OP wants you to search for that information. I looked at his profile and see a picture of a 2006 Pace Arrow and under it he's put his information:
bennefim wrote:

36 Ft, Model 36D
Workhorse Chasis, 8.1 V8
Allison 1000 Transmission
TOAD: 2008 Honda CRV
RoadMaster Tow Equipment


Wouldn't it be great if he had posted that with his request for assistance?

maillemaker

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Posted: 09/12/19 06:56am Link  |  Quote  |  Print  |  Notify Moderator

If you open up your generator compartment and look inside there will be a nameplate on the Onan generator. This will tell you the model number of your generator.

Some newer Onan generators have a display that will generate error codes that can help diagnose problems.

The first thing to confirm is are you getting fuel. The Onan generators have an external fuel pump. The easiest way to test this is to hook a clear rubber tube up to the outlet of the fuel pump and stick the other end in a gas can. When you try and start the generator you should see a flow of fuel. Alternatively you can hook the fuel pump up to 12 volts and make it run that way.

Be careful here as you are playing with an open can of gasoline and could be making sparks. Keep a fire extinguisher handy.

Another thing you can do without cracking anything open is just try to start the generator half a dozen times. You should smell gasoline from the exhaust if the engine is getting gas.

You can also pull one of the 2 spark plugs (the front one is usually easier to get at) and see if it is wet. If it's we and smells like gas, you are getting gas.

Next check for spark. You can get cheap inline spark testers like this for less than $10:

https://www.amazon.com/ENA-Universal-Automotive-Motorcycle-Fool-Proof/dp/B07GHBNFKZ

Beware it can be hard to see the light bulb light up in direct sunlight. But it's super easy - disconnect the spark plug wire from the spark plug, and stick this tester in the middle. Now the light bulb lights up as electricity goes to the spark plug. Ideally you'd test this on both spark plugs but it's hard to get at the one on the back side of the generator. Generally if you're getting spark up front then you are probably getting spark in the back.

The most common problem with these generators is the fuel pump quits working or the carb gets gummed up from not being run often enough. It is critical to run these generators every month under load for at least 30 minutes. The heat and vibration and flushing with fresh gasoline helps keep the inside of the carburetor clean. This is especially true with today's ethanol gasoline. If your carb sits you can end up with condensation water inside the carb and things start growing in there. Varnish, gum, debris, mold and gunk clogs the tiny passages inside the carb and require a rebuild or new carb to fix. "Mechanic in a can" fixes like Seafoam, etc., seldom work.

Also check your oil level. As others said, some Onan generators have will shut down if they do not detect oil pressure.

If your control board is suspect, Flight Systems will diagnose it for $20 and put the price of the test towards a new board if you buy one from them.

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