My generator does not empty the bowl when I run it dry. 125 is plenty enough to start. On other small engines they say you need at least 50 psi or engine won't start. It wont start, backfires though the carb and the starter can barely turn it over. About 13 yrs old. If this has occurred, fix the connections. Oil pressure and generator voltage build up within 1-2 seconds. Onan Power Generator: What You Need To Keep In Mind. Had 40 psi when it eventually wouldn't start even on ether, I fixed that and it started. I have also put in a new plug. I had a 5 hp engine that got harder to start over the years. The gas in the bowl had started to go bad and was making my needle valve stick open. The best place to start with troubleshooting your generator is with some of the most common causes of starting issues. Topic: Onan 4000 Generator cranks, but won't start. It is vapor propane the tank is nearly full the main regulator is new. I have checked the compression, to verify the valves are ok. but not great. any ideas? I have adjusted the valves to .005 on both intake and exhaust. 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. Sometimes jostling from moving the generator can knock loose connections. Engine cranks real good but after about 15 secs of cranking, it backfires. I hadn't ran the generator for anout 5 weeks and it wouldn't start today. After any service is performed on a unit, always double check the generator system yourself. onan propane rv generator backfires thru carb when trying to start. Replaced magneto due to a broken wire, when I put it back together the engine still won't start. I noticed the fuel was low so I put 10 gallons of gas in the trailer. I found that out the hard way earlier this past spring. Generator backfires and wont start. 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. This is a common problem with newer generators that are not run on a regular basis. It basically ran as yours is doing, surging, backfiring, and flooding badly. Its a Briggs Model 31P777 Type 0296-E1. references Cummins Onan: Maunals Erick Kristian Erick Kristian began writing professionally in 2008. Closer tolerances within the fuel systems to meet today's emission requirements make fuel … 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 it starts it runs rough for a while then runs o.k. The engine then cranks and starts. 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. 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. Rick:Red 97 F350 CC DRW 4. This is what normally happens when you start your genset. 4.0 KY Onan Generator MicoQuiet. 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. 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. generator is model #5.5 HGJAB-1270D. Open the generator (ensure it is off) and check to make sure the electrical connections are intact. Replaced the coil and carburator. A common problem with newer generators that are not run on a unit, double! You need at least 50 psi or engine wo n't start that and it started, and flooding badly of... Operating correctly in that the movement appears the same although i have adjusted the valves to.005 on intake! 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