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Old 07-12-2015, 07:42 PM   #15
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I also use a marine/rv battery and my rig is a 98.

You can disconnect the starter at the relay and listen for the pump.
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Old 07-13-2015, 08:27 AM   #16
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My Onan 4000 on my last MH would only run for 15 minutes or so. It was in a 2004 Greyhawk. Turns out it was the electric fuel pump. It costs about $80. Not a huge job to replace. It's located left side of the genny.
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Old 07-13-2015, 12:05 PM   #17
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The pump on mine worked but during the service I found the power supply wire to the pump was slightly damaged by vibration as it rubbed on the metal base of the generator.

The pump is located under the mounting plate for the starter solenoid, first there is the fuel line coming in, then there is the filter and then the pump. The ground for the pump is the point at where it bolts to the base of the generator. So on my pump I had to repair the power wire and also clean the mounting point for the pump because it was rusty.

If you disconnect the wire going to the starter from the starter solenoid you can hear the pump working, you may also want to disconnect the fuel line after the pump and see if it is pumping fuel. Obviously you don't want to get fuel inside the generator housing because of the fire hazard. So it's a good idea to check the fuel line to the carburetor while you are working on it. I replaced mine.
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Old 07-13-2015, 03:07 PM   #18
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When you mention the relay are you talking about the starter relay or one that switches the generator to the ignition circuit? I also have found that it will stay running with a fine mist of starter fluid going into the air intake. After I take that away, it will sputter and shut down. I did remove the gas line to the carb while trying to start it and it seems there is enough gas being pumped out. One other thing, the adjustment at the bottom of the carb. If I go counter clockwise just a little it will leak. I pulled the needle all the way out and there is no 'O' ring at the end, do you know if there should be? the needle itself looked ok except it has a little carbon like material on the end of it. Someone suggest to just replace the carb. i'm thinking of abandoning the whole thing and buying a portable generator and somehow wiring that up. What do you think?
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Old 07-13-2015, 10:20 PM   #19
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These are very simple motors, like an old lawn mower. It sounds like yours has a gummed up carburetor. Get the carb cleaned before throwing it out for a whimpy little portable.
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Old 07-13-2015, 10:39 PM   #20
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Quote:
Originally Posted by ldworak View Post
When you mention the relay are you talking about the starter relay or one that switches the generator to the ignition circuit? I also have found that it will stay running with a fine mist of starter fluid going into the air intake. After I take that away, it will sputter and shut down. I did remove the gas line to the carb while trying to start it and it seems there is enough gas being pumped out. One other thing, the adjustment at the bottom of the carb. If I go counter clockwise just a little it will leak. I pulled the needle all the way out and there is no 'O' ring at the end, do you know if there should be? the needle itself looked ok except it has a little carbon like material on the end of it. Someone suggest to just replace the carb. i'm thinking of abandoning the whole thing and buying a portable generator and somehow wiring that up. What do you think?
I think you should rebuild the carburetor on the one you have, it sounds like blocked jets in the carburetor, nothing major. Just take the carburetor off and clean it. Get some carb cleaner and just take the carb off, take it apart and clean it. It's a very easy thing to do, you may even enjoy it.

At least we know now it is a fuel problem and not the fuel pump or the filter.

There are a number of reasons why I would not replace the generator. Cooling and air flow design are just two. The Onan sucks air in at the front and blows it along the generator towards the exhaust and out the bottom, keeps everything relatively cool. A run of the mill generator will not do that and I would never run one in an enclosed space like I would the purpose built Onan.

You could have problems with a new generator and not know how to repair it. Happens a lot. Would you rather have a Onan or a cheap generator made in china?

My Onan has over 2000 hours on it and doesn't even use as much oil as the lawn mower does.

You don't need to worry about the starter replay or solenoid, the problem is in the carburetor.

Think about it this way, you can try cleaning the carb and if that does not work you can think about buying a new generator.
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Old 08-07-2015, 03:20 PM   #21
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Sounds like you have a load on. The self adjusting throttle/carb/choke may be an issue too. There is also a a transistor and a solenoid that control the speed of the genny at start up to the governed speed.
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Old 08-08-2015, 07:48 AM   #22
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Well its going in for repair I can force it to stay running with a light spray of starter fluid so my guess it's either car or control board shutting it down. Thanks for all the advice
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Old 08-13-2015, 02:11 PM   #23
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Seafoam Treatment

I am back at it. I can get it to keep running if I spray a continual mist of seafoam treatment into the air cleaner. I am going to take out the carb and have someone clean or rebuild it and go from there. Will update when I know more
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Old 08-15-2015, 07:23 PM   #24
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Most Onan carbs can't be rebuilt successfully because the orfaces are so small. The oxygenated fuel we are forced to use makes hard deposits inside the carb and no carb cleaner can break that down. You will be just wasting your money. Replace the carb and use Stabil in your tank.
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Old 08-16-2015, 07:43 AM   #25
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I happen to agree with the boss I also have a couple of generators and both of them had the carburetors rebuilt and both of the carburetors eventually caused a problem.
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