Onan 4KW starting issues
Our 2014 Newmar Baystar has the 4KW gas Onan generator. I find that starting it after it sits for a few weeks is difficult. It turns over readily, but won't catch. I find that primeing it helps. Is th...
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I've found quite a few people haven't read their manual and don't know you hold the 'stop' button down until the display comes on. This runs the electric fuel pump to prime the carburetor before pushing the 'start' button. Also, Onans have a drain valve on the bottom of the carburetor bowl (no, it's not an adjustment valve). Use a small cup to catch the drained gasoline. Also keep in mind the 'top tier' gasoline specs require fuel stabilization be included that makes fuel good for one year (no need for Stabil). Note this does not negate the need to drain a float bowl as dried up gasoline still leaves a hard deposit that will close up the precision jet hole in the carb and cause a lean condition that makes hard starting and a 'surging' running. If you are following proper priming procedure and the unit still starts hard, most likely that jet in the float bowl dip tube is undersize from said deposits. It's possible to carefully clean these. CAREFULLY using a welding torch tip cleaning tool works but just replacing the carb is probably the easiest strategy for most people.
