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

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Onan micro 4000 runs about 45 minutes and dies flashes code 13

Code 13 : undercurrent

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Sometimes people mistakenly think there's a problem with a carb on Onan 4000 generators. 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 savy 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. 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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It's getting hot and shutting down

Posted on Jul 14, 2009

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Troubleshooting generators


If this unit dies under load conditions, decrease your load and try it again.
If this happens under no-load conditions, check your fuel supply. Start with the filters, then check pressure and flow.

Jul 21, 2014 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

1 Answer

Starts runs for a minutes quits but if you keep pushing the start button it keeps running


Check rotor slip rings for cleanliness, brushes, stator resistance, rotor resistance. Then replace control board if they check out.

Feb 15, 2013 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

1 Answer

Starts runs for a minutes quits but if you keep pushing the start button it keeps running


You say Guardian that is Generac???? Then you indicate Onan 4.0KY. If it is a Onan and it stops after you release the button there are a couple of things. 1 st check the brushes, and polish the rotor slip rings, check the resisitance of the rotor, the electrical harness plugs are tight. The control requires a voltage feedback while cranking to engage the PCB run circuits, if all those check out you have a bad control board.

Feb 15, 2013 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

1 Answer

How to fix onan 4000 that will not stay running


Check the slips rings and brushes, check the stator and rotor windings for continuity and for shorts to ground. Check PCB plug connections. After that you need a new control board

Jan 07, 2013 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

1 Answer

I HAVE A 5.0BGE ONAN GEN SET IN MY RV IT RUNS BUT THERE IS NO ELECTRICAL POWER TO RV ALL FUSES AND BREAKERS OK. ANY HELP APPRECIATED


Possible solution: if it's been sitting idle for some time, you might need to flash the windings. see this link:
http://www.endtimesreport.com/dead_gen.html
If you're uncomfortable doing it yourself, your Onan dealer can do it in 10 minutes.
Don't forget to check the circuit breaker on the generator itself!

Sep 01, 2011 | Watts Onan Portable Generator - 4000 ,...

2 Answers

ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?


does it have original oil in it? if so they use a lighter weight oil than recommended for engine break in. change your oil and filter and see if that doesnt solve it.could be thinning out loosing pressure when hot. i have seen this beofore.. :)

Mar 24, 2009 | Watts Onan Portable Generator - 4000 ,...

2 Answers

ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?


Try to restart to see what happens. However, make sure to have a volt meter to check output voltage. You may be loosing voltage and therefore it shuts down. Check oil pressure switch, rings, brushes. Replace brushes if they are less than 1/2" short and clean rings with emory cloth until copper is noticable.

Jan 21, 2009 | Watts Onan Portable Generator - 4000 ,...

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