Question about Watts Onan Portable Generator - 4000 , Model# 5500

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My gas powered Onan (model 4ky) generator starts, but shuts its self off after about 20 minutes of running. Before it shuts off, you can hear it prime. After it shuts off, it will not start anymore for hours. The generator is about 10 years old, but onl...

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Be sure to ensure the fuel pump is pumping fuel to the carb by pulling the hose off the carb and watching for adequate flow. A faulty electric fuel pump can often only show symptoms or act up after it is warmed up. Sometimes it may run for 10 or 20 minutes and just shut down. Check for fuel flow immediately upon stalling if this is your symptom. Mine would shut down after 20 minutes and not restart for awhile. I pulled the hose off the carb immediately and noted there was no fuel in the line and it would not pump fuel while holding the start switch on either. If you are mechanically savvy you can disconnect the hot wire the positive wire (red) leading into the fuel pump and connect it with 12 V and see if it pumps fuel out the hose also, but be careful to capture the fuel coming out the hose). Once cooled down it pumped fuel in a weaker than normal stream, but when hot after 10 or 20 minutes it quit pumping causing stalling of the generator. Replaced the fuel pump (and new filter while at it) and everything worked fine again on my 1995 Onan. Much stronger fuel stream noted too from the hose.

Posted on Aug 25, 2017

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Sounds like your coil is done

Posted on Sep 09, 2010

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What can cause the plastic fins on the rotor of my Onan 4ky generator to break off and rotor to rub on stator? Bearings are good no play.


Was every thing oily in the generator? It sounds like you may have lost a bearing in the engine. You definately don't want to spend without finding out where the play is that let it rub. It will do it again. Check and make sure that the rotor isn't loose on the motor shaft. Make sure the bearing housing on the end of the rotor won't let the bearing move around in it.

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Will not start gas not getting to it


This might sound dumb ... is the fuel valve turned on?

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Our onan generator ran out of gas. we refueled but the generator will not start. i gave it a shoot of starting fluid, the generator fired and run for a second, then died. could it be a cogged fuel filter?...


No, not the filter, you will need to try to prime the carb better then with starting fluid, pour some gasoline down the carb, you may have to do this a few times, but everything will fire back up again once you get the air out of the system

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I have a 1999 Onan Generator start/stall issue


Check your oil level. The unit will stay running as long as you have the switch depressed. When you get enough oil pressure a switch closes & keeps it running.

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1 Answer

Onan microquiet 40000 in toyhauler ,runs for 15minutes and off


Take and locate the oil pressure switch and try bypassing it,if that aint it check fuel filter and pump.

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First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

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