onan 4k gen
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Jun-29-2021 11:14 AM
Amatuer Radio KF6OOK
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Jul-01-2021 10:46 AM
Amatuer Radio KF6OOK
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Jun-30-2021 07:51 AM
Either way, the fix is to remove and clean the jet and if equipped there is a tiny emulsion/mixing tube above the jet which has a bunch of little tiny holes.. It only takes one of those holes to plug to cause hunting..
If no tube then there may be a passage way past the jet clogged..
Not totally familiar with Onan carbs but have worked on a variety of small engine carbs from B&S, Honda and Honda clones and most of them use pretty much the same setup.
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Jun-29-2021 10:32 PM
Take the California Emissions cap off and richen it until it runs smooth.
2005 Forest River T26 Toy Hauler
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Jun-29-2021 04:56 PM
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Jun-29-2021 03:20 PM
They will clog easily unless you drain the bowl completely and sadly the bowl drains tend to not be at the lowest point of the bowl leaving a small puddle of fuel at the bottom. Removing the bowl effectively dumps out every bit of leftover fuel.
Just had to deal with a clogged jet on a portable 4Kw gen I take camping, was lazy the last time I used a couple of yrs ago, only pulled the drain plug. Left one heck of a mess in the bottom of the bowl this spring and was only able to keep the gen running at half choke. Took two times removing and cleaning jet and tube to get gen to run perfectly without choke.
Just a fact of life.
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Jun-29-2021 03:01 PM
Amatuer Radio KF6OOK
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Jun-29-2021 01:07 PM
Draining bowl does not drain all fuel, it will typically leave a small amount in the bottom of the bowl unless you remove the bowl and dump it..
That leftover remaining fuel as it evaporates off tends to attract moisture from the air which often will corrode the fuel bowl.. The corrosion sits on the bottom of the fuel bowl until you fill the bowl and then it gets picked up by the jet and clogs the jet and or passages.
Hunting means you typically have a starvation fuel problem (IE lean condition), if you have a manual choke you can sometimes "correct" lean condition by closing the choke until smooth.. But that is not a real fix, just a bandaid plastered on top of the problem.
You need to find out if you are getting enough fuel from the tank (weak pump or fuel line issues).
If you have good fuel flow then carb cleaning most like is needed.. If I remember correctly, Onan doesn't recommend cleaning the carb, only replacement and they are not cheap and a few models impossible to source.. I would try removing the carb from the engine, breaking it down and remove and clean the jet and passages first if you have plenty of fuel flow from your tank..
On edit, I should note that on some gens the fuel pump may be electric and some are vacuum "pulse" pumps which use the intake vacuum pulses via a rubber diaphragm.. The diaphrams often get softened from the gas, sometimes they get brittle and brake or they may get a pinhole causing the fuel pump to not work correctly..
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Jun-29-2021 12:45 PM
Amatuer Radio KF6OOK
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Jun-29-2021 11:27 AM
If so, hunting is typically too lean of a mixture which would indicate a plugged carb jet or not enough fuel in the carb bowl.