tatooedwhtboy Posted December 8, 2011 Posted December 8, 2011 Does anybody know anything about these Onan generators? I replace the fuel filter thinking it was plugged up....NOPE not the filter. Then removed the carb for a good cleaning...NOT the carb. It will fire up for about 4 seconds then die. No power Thanksgiving weekend= not a happy camper!!!! Quote
dunefreak Posted December 8, 2011 Posted December 8, 2011 Have u tried to see if it stays running on carb spray? Might have a bad fuel pump. Quote
tatooedwhtboy Posted December 8, 2011 Author Posted December 8, 2011 yeah. carb cleaner and starting fluid. doesnt stay running. it is getting fuel, i took the fuel line off and cranked it Quote
bansheerider Posted December 8, 2011 Posted December 8, 2011 I have an onan 4000 same problum it was the carb can not rebuild them got a new one from cummins on losi rd here in las vegas 160.00 runs just fine now Quote
tatooedwhtboy Posted December 8, 2011 Author Posted December 8, 2011 thats what i wanted to avoid Quote
dunefreak Posted December 8, 2011 Posted December 8, 2011 If it doesn't stay running on carb spray, it's NOT the carb. It might be worth bringing it in to Johnny Walker. They looked at mine for a similar problem. It ended up being a bad coil breaking down under load. Not saying that's your problem, but they deal with these problems day in and day out. It's worth the $100 or so to diag it properly. Otherwise your just throwing parts at it like I did. Talk to Ken Allen if you do go down there and tell him DDR sent ya. He will take good care of you. Quote
lindernglamis Posted December 8, 2011 Posted December 8, 2011 Same problem, ended up replacing the carb. Mine would run for a couple of seconds and die. i tried to clean the carb but the orifices are so small once the are clogged you are screwed. The onan people told me to just run it once a month to avoid any issues like this. I run mine for 5-10 minutes and I have not had a problem since and I had mine fixed two plus years ago. Quote
tatooedwhtboy Posted December 9, 2011 Author Posted December 9, 2011 well i guess ill take your advice Pete, no sense in dumping $ into it and not fixing the problem. Johnny Walker here i come!!!!! Quote
bp-guy Posted December 9, 2011 Posted December 9, 2011 While you in there install a shut off valve on the fuel line. That way you can close off the fuel and let the generator run itself dry and use all the fuel in the carb. Just don't have a load on the generator when you do this. Quote
dunefreak Posted December 10, 2011 Posted December 10, 2011 While you in there install a shut off valve on the fuel line. That way you can close off the fuel and let the generator run itself dry and use all the fuel in the carb. Just don't have a load on the generator when you do this. ...or use vise grips Quote
tatooedwhtboy Posted December 10, 2011 Author Posted December 10, 2011 vise grips huh? that my type of shut off vavle Quote
dunefreak Posted December 10, 2011 Posted December 10, 2011 vise grips huh? that my type of shut off vavle yup, just squeeze the line shut until she stalls. haha Quote
sandawg Posted December 10, 2011 Posted December 10, 2011 (edited) Injector/carb cleaner occationallly and gas stabilzer when sitting for a while. Haven't had a problem in 6 years! Trailer is a 98 and gen has nearlly 900 hours on it. Did the spray de carbon it last year. Change the oil and filter every season. Edited December 10, 2011 by sandawg Quote
tatooedwhtboy Posted January 9, 2012 Author Posted January 9, 2012 well ive got good news. Ran some Onan 4C through the carb, replaced the fuel pump and BOTH fuel filters. Gen runs like a champ. Thanks for all the input guys Quote
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