Its a Briggs Model 31P777 Type 0296-E1. Open the generator (ensure it is off) and check to make sure the electrical connections are intact. I hadn't ran the generator for anout 5 weeks and it wouldn't start today. I noticed the fuel was low so I put 10 gallons of gas in the trailer. 125 is plenty enough to start. Had 40 psi when it eventually wouldn't start even on ether, I fixed that and it started. I have checked the compression, to verify the valves are ok. My generator does not empty the bowl when I run it dry. Rick:Red 97 F350 CC DRW 4. onan propane rv generator backfires thru carb when trying to start. Generator backfires and wont start. Replaced the coil and carburator. If it starts it runs rough for a while then runs o.k. I have also put in a new plug. About 13 yrs old. 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. 4.0 KY Onan Generator MicoQuiet. Topic: Onan 4000 Generator cranks, but won't start. Onan Power Generator: What You Need To Keep In Mind. After any service is performed on a unit, always double check the generator system yourself. The engine then cranks and starts. It's a 7hp or 120cc single cylinder engine without a exhaust box. Replaced magneto due to a broken wire, when I put it back together the engine still won't start. generator is model #5.5 HGJAB-1270D. Engine cranks real good but after about 15 secs of cranking, it backfires. On other small engines they say you need at least 50 psi or engine won't start. I found that out the hard way earlier this past spring. This is what normally happens when you start your genset. I have adjusted the valves to .005 on both intake and exhaust. It basically ran as yours is doing, surging, backfiring, and flooding badly. This is a common problem with newer generators that are not run on a regular basis. Closer tolerances within the fuel systems to meet today's emission requirements make fuel … 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. references Cummins Onan: Maunals Erick Kristian Erick Kristian began writing professionally in 2008. but not great. The gas in the bowl had started to go bad and was making my needle valve stick open. 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. If this has occurred, fix the connections. It wont start, backfires though the carb and the starter can barely turn it over. any ideas? 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. 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. 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