I have an onan 320 gen set it starts and runns great after say 2 minutes it shuts down
I'm not familiar with this gen set, but assuming it is gas/petrol, it sounds like the motor side is quitting without even connecting an electrical load, correct?
If so, check silly things first. The 2 prime suspects are too much, or too little fuel....
Too much fuel - Is the choke still closed??? If it will start fine when cold, but start to chug and cough as it warms up, this is highly possible.
What about an air-filter? If its dirty and not breathing well, a dirty air filter will act just as if the choke is still on.
Too little fuel - Is there a fuel petcock/valve, and is it open 100%? If its just 'cracked open' and dribbling fuel to the carb, the fuel bowl can fill while its sitting, then start up and run great for a short while, until the fuel in the bowl is starved and then it will just cough/puff to a stop until bowl refills.
Also, is there a fuel filter that is clogging perhaps? A classic problem like this sees the motor start and run sweet for a minute or 2.....until the filter picks up all the crud again, which in turn starves the motor of fuel.
NB if the 320 on the model no refers to a 320 KW(!) unit, then it is almost certainly a big diesel unit, in which case the above is null and void ;)
on Nov 14, 2018