Pressing and holding the start switch causes the control board to send 12 volts to the ignition, fuel pump, choke heater, start solenoid and field flash circuits. Replaced magneto due to a broken wire, when I put it back together the engine still won't start. Sometimes jostling from moving the generator can knock loose connections. Oil pressure and generator voltage build up within 1-2 seconds. I found that out the hard way earlier this past spring. After any service is performed on a unit, always double check the generator system yourself. I noticed the fuel was low so I put 10 gallons of gas in the trailer. references Cummins Onan: Maunals Erick Kristian Erick Kristian began writing professionally in 2008. I had a 5 hp engine that got harder to start over the years. generator is model #5.5 HGJAB-1270D. This is what normally happens when you start your genset. My generator does not empty the bowl when I run it dry. Had 40 psi when it eventually wouldn't start even on ether, I fixed that and it started. The best place to start with troubleshooting your generator is with some of the most common causes of starting issues. any ideas? Replaced the coil and carburator. In this article, we’ll take a look at the top 10 reasons your generator won’t start and get you on your way to fixing them. Closer tolerances within the fuel systems to meet today's emission requirements make fuel … Posted By: Attila on 05/02/10 10:04pm I just got a brand new 5th wheel and followed the break-in procedure on my Onan RV-QG 4000 EVAP Gen set. The gas in the bowl had started to go bad and was making my needle valve stick open. Fortunately, troubleshooting Onan generator is not a difficult task so as long as you could grasp the fundamentals, everything would turn out to be fine. Onan generator backfiring & stalling Don't know your gen model but a couple goofy things that I encountered on my prior moho gas generator was a steel braided. onan propane rv generator backfires thru carb when trying to start. I have also put in a new plug. I have adjusted the valves to .005 on both intake and exhaust. Rick:Red 97 F350 CC DRW 4. On other small engines they say you need at least 50 psi or engine won't start. If this has occurred, fix the connections. This is a common problem with newer generators that are not run on a regular basis. 125 is plenty enough to start. Generator backfires and wont start. Onan Power Generator: What You Need To Keep In Mind. but not great. I hadn't ran the generator for anout 5 weeks and it wouldn't start today. I have checked the compression, to verify the valves are ok. It is vapor propane the tank is nearly full the main regulator is new. Its a Briggs Model 31P777 Type 0296-E1. It's a 7hp or 120cc single cylinder engine without a exhaust box. Take a look at the information below and you could take care of the issue of “ Onan generator starts then shuts down ” in no time. If it starts it runs rough for a while then runs o.k. The valves seem to be operating correctly in that the movement appears the same although I have not measured them. Open the generator (ensure it is off) and check to make sure the electrical connections are intact. Topic: Onan 4000 Generator cranks, but won't start. About 13 yrs old. It basically ran as yours is doing, surging, backfiring, and flooding badly. 4.0 KY Onan Generator MicoQuiet. It wont start, backfires though the carb and the starter can barely turn it over. The engine then cranks and starts. Engine cranks real good but after about 15 secs of cranking, it backfires. Valve stick open the generator for anout 5 weeks and it would n't start even on ether i! 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