I bought it off him for $75.00 I went to NAPA bought a new Faccett fuel pump $19.95 and presto. On an off chance the carburetor isn't the issue, try a new spark plug. It's likely time to replace it anyhow, and a new one is cheap. This lets me work on various things without having to pull it out etc. I posted a while back that my generator wouldn't start. Anything over 200 degrees Fahrenheit is high and likely the cause of the problem. If it still shuts off clamp the fuel line closed or turn off the fuel valve as soon as it quits and then take the carburetor bowl loose and see if the bowl is full of fuel. Remember, starting watts are temporary and your generator can only produce them for so long. After enough time has passed the generator will overload and either shut off due to the circuit breaker, or if it doesn’t have a circuit breaker then it will keep running and eventually overheat which could lead to a fire. I have a Champion , 8 years old , that ran fine until last summer , then the ethanol in the gas finally gummed up the carb and now I've got to remove same and clean it up . 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. I just got around to flushing out the tank and carb bowl, added some fresh gas and additive. This will also be beneficial for the main engine. Monitor the temperature gauge and take note of the temperature immediately after the generator shuts down. Is this an air leak? The low oil sensor can also be the culprit. To prevent this from happening use a fuel stabilizer mixed in the gas prior to shut down. The generator will start and appears to run at speed with the choke on but it dies when I move it to run. Check the coolant levels after the generator has cooled down and refill them if necessary. I have a Wen PowerPro 5500 genset approximately seven years old. 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. Make sure it is mixed in the gas tank, usually 1 oz per gallon and then run gen long enough to get the treated fuel into the whole system. Greetings friends! This past weekend my Champion Generator 3500/4000 starts right up but started missing and then shuts off after 5 to 10 minutes of running AC. I , always turned off the gas and let the engine run until it ran all the gas out of the carb . Lately it has been suddenly shutting off after a few minutes - no stall, struggle or rough running before it stops, just suddenly like the "off" switch was flipped. (Jets usually clog only if you used dirty fuel or let it sit a long time (years) so it turned to varnish.) I shut off the AC and tried to run a vacuum cleaner same thing. There is still fuel left that turns to a thick brown looking varnish. I dont know how easy it is to get to the intake or carb but when you start it you can spray fuel into the carb if it keeps running then it is a fuel issie if it stall like it was, then it is electrical. Onan Power Generator: What You Need To Keep In Mind. It has a Ducar (apparently Chinese) OHV single-piston air-cooled engine. If the generator runs then shuts off it may be a temperature issue. This is the Champion 4500 watt with the Honda knock-off engine. Once you have the generator working again, perform the following maintenance to ensure you don't get stuck again. Engine oil should be changed after 25 hours running time or 12 months, whichever comes first. If it runs and does not shut off, then the oil switch is likely the problem. Answered by LCD: Then pretty clear it is getting spark but sounds like it is starving for air or fuel - blocked fuel strainer in tank, plugged fuel line, badly plugged air filter, plugged idle and/or main jets. 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