This is a common problem with newer generators that are not run on a regular basis. If it starts it runs rough for a while then runs o.k. Onan Power Generator: What You Need To Keep In Mind. Rick:Red 97 F350 CC DRW 4. I noticed the fuel was low so I put 10 gallons of gas in the trailer. I had a 5 hp engine that got harder to start over the years. 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. After any service is performed on a unit, always double check the generator system yourself. any ideas? It is vapor propane the tank is nearly full the main regulator is new. Replaced magneto due to a broken wire, when I put it back together the engine still won't start. 4.0 KY Onan Generator MicoQuiet. generator is model #5.5 HGJAB-1270D. 125 is plenty enough to start. It's a 7hp or 120cc single cylinder engine without a exhaust box. The valves seem to be operating correctly in that the movement appears the same although I have not measured them. About 13 yrs old. Oil pressure and generator voltage build up within 1-2 seconds. 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. 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. On other small engines they say you need at least 50 psi or engine won't start. references Cummins Onan: Maunals Erick Kristian Erick Kristian began writing professionally in 2008. I have also put in a new plug. Open the generator (ensure it is off) and check to make sure the electrical connections are intact. onan propane rv generator backfires thru carb when trying to start. Sometimes jostling from moving the generator can knock loose connections. Replaced the coil and carburator. I found that out the hard way earlier this past spring. The engine then cranks and starts. but not great. Its a Briggs Model 31P777 Type 0296-E1. It basically ran as yours is doing, surging, backfiring, and flooding badly. 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. I hadn't ran the generator for anout 5 weeks and it wouldn't start today. This is what normally happens when you start your genset. Had 40 psi when it eventually wouldn't start even on ether, I fixed that and it started. If this has occurred, fix the connections. I have adjusted the valves to .005 on both intake and exhaust. The best place to start with troubleshooting your generator is with some of the most common causes of starting issues. I have checked the compression, to verify the valves are ok. 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