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Old 07-28-2012, 08:53 PM   #1
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Onan 4000 Dies when u let go of start switch

Hey all im new to the form. My question is for my brother inlaw. He has a 2007 weekend warrior FS23 with Onan 4000. My Gear box has the Onan 5500 its diff from his. So I need to know does this 4000 have a low pressure switch/sender? I dont see any place for it, or an oil filter. His will run untill u let go of the switch, then die, I was thinking low oil switch but cant find it? I pulled float bowl and carb is clean. Last time he used it he ran it our of fuel & did not use the trailer again for 3 months. He keeps it in storage out of town, so he could not run it once a month. Anyone have any ideas what this could be? I dont think it could be fuel pump or filter b/c it primes, When I had float bowl off I could lower float and hit prime and it was getting plenty of fuel. Maybe carb needs to come off and get cleaned. Hope its not the Control box.

Thanks for any advice
Justin
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Old 07-28-2012, 09:53 PM   #2
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I just went through this with my gen set and although we have different models and years, I think they all go through the same proccess in which they need to run.
My problem turned out to be a bad voltage regulator but could be a number of other things with yours. Best thing to do is what I did and that is to search the internet for some sites that give ways of testing circuit boards, voltage regulators etc.
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Old 07-29-2012, 06:37 AM   #3
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Mine did the same thing, die as soon as finger quit pushing start button. Found control module was not sending field flash signal to gen. New module $130 from flight system. This link has excellent troubleshooting info and you can send your module to them and they will repair it with warranty. They will check it to make sure it is the problem too. Check this out. Troubleshooting/Cross-Reference Guides | Flight Systems
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Old 07-29-2012, 07:20 AM   #4
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I think everything has been touched on. There are 2 things that turn the motor off -- low oil and bad generator (over speed or no output) output.

If both are actually OK then the switches are suspect.
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Old 07-29-2012, 10:06 AM   #5
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FWIW someone posted a while back that Onan quit using the low oil switch sometime after 1996 but he didn't give a date.
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