ONAN 4KYFA26100K won't stay running

Turn all your breakers off then see if it continues to run after the 20 minutes then one by one turn the Breakers on till the problem comes back that circuit is your problem

Maybe check carefully for obstructed cooling airflow due to leaves, mouse nests, milkweed fluff, or whatever.

You need to stick around while it is running and see what is happening.

The A/C is not a good test load to use when the power might be fluctuating a lot.

If there is a fuel filter has it been changed lately ?

I think your Model Number is missing a Leading *K* and doesn't have */* in it. Does the Tag on your Genny look like this?



Here's the Owner Manual with Fault Codes. If it blinks *36* which is actually three blinks then six blinks, it probably ran out of gas. We've had a rash of fuel pump failures on these lately. $100 or so part from ONAN, about half that on Amazon.

A few years ago, we lost a few 4KY's with lubrication failure from low oil. By the time ONAN got to Spec *K* the Oil Level Sender had been discontinued. Up to us to keep it full. They're splash lubed like a mower engine, so no Oil Pressure Switch.

I have the Service Manual and Parts List for 4KY Spec K if that's what you actually have. Just PM me with your email id.

Unfortunately, I am leaving in 2 days for 4 weeks. It will be awhile before I can check anything else out.

The fuel filter has never been changed, so I will get one and install it, while checking for air obstructions.

After it died the first time (while running the A/C), I switched to the space heaters so I would not risk the A/C.

The model number is what Winnebago put in the manual. The actual generator has 4KYFA26100K.

PM sent to j-d

Thanks guys. When I get back, I will let you know what I find.

Bobbo

This Airtex on Amazon should replace your fuel pump if you decide that's what you want to try. If you search "onan 4ky fuel pump" on Amazon, you'll find several, including this Airtex and a Cummins-Onan branded one at $80-something. One of our OP's has a step-by step for changing it. You need a T-30 TORX Bit in addition to a few ordinary tools.

After watching a couple of Youtube videos on changing the fuel filter, I ordered that Airtex fuel pump, a fuel filter, and an air filter. If I am going to go in there, I am replacing all of those parts. I am having them delivered to my daughter's house since I won't be home, but am replacing all 3 while I am in there next month. (I do have a set of TORX drivers.) Thanks for all of your help. I will post a followup after installing them.

While I am in there, I would like to install a fuel shutoff valve so I can kill the generator by fuel starvation to empty the carburetor. It appears from the documentation that j-d sent me that the fuel line is 3/8" ID and 3/4" OD. Is that correct?

Anyone know where I can find a gasoline rated shutoff valve that will fit that hose?

Thanks

Bunch of them on Amazon.

That said, I think I'd put a switch in the wire to the Pump.

Valve's be nice for working on the genset, but how often do you plan to do that?

I think the fuel line is more like 1/4" inside diameter. I had ours off and it looked more line 1/4 than 3/8. Also CD mentioned a 1/4" plug when working on his ONAN.

Good idea. Thanks for the suggestion.

I have ordered this push button switch. It is a marine switch so being exposed to the elements should not matter. I can put connectors on the wires matching the ones on the Airtex pump and it will be plug-n-play. (Also easy to remove if problematic.)