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

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4000 onan will start and run 5 to 10 minutes and stops . Will start back up and will do the same.Has new oil new air filter new fuel pump and filter carb kit . new battary . new plug . Help

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Check oil sensor and oil level check tank for sediment and lines and crb for sediment also coil maybe going bad!!! :)

Posted on Jul 02, 2009

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Onan 4000 Microquiet shuts down after running for 20-30 minutes. If I direct 2 high power (400+ CFM) fans to the underside of it -it will keep running indefinitely.


check the current draw from the machine
being a 4000 watt machine if you are drawing 4000 watts it is overloaded as that is the surge power available not constant power which is around 3500 watts
that would account for the requirement of fans to keep it cool
even if It is not 4000 watt what ever capacity it is it is running in an overload situation

Jul 10, 2016 | Onan Microquiet 3600 & 4000 Generator

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My onan 4.0 generator will not idle and is back fireing while trying to run it will run fine for ten min then starts trying to die and starts back fireing when I try to keep it running


check for a faulty sump oil switch . check for faulty coil ( magneto on the flywheel) as the time it runs suggests that it is breaking down internally.

Feb 11, 2015 | Onan CUMMINS 4.0 KYFA/6747 - Cummins...

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I have an onan 4000. will start but then sut off. chanced spark plug oil filer and fuel selnoid not sure what to do next


this may sound like a smart *** answer but turn on its side and shake it the low oil switch is stuck

Aug 04, 2011 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Onan generator dies after 2-3 hours of running , wiil not restart rigt away wait 10 minutes starts no problem then runs for 15 minutes shuts down and keeps reapeating on 15 off 10


This sounds like overheating. These small generators don't have overheating protection, but if a low oil pressure or low oil level is present it may be the reason for stopping.

Check the oil level in the starting conditions and again when it stops. It may become under the "stop" level and after some time the precipitated oil has reached the "start" level. The same may be with oil viscosity and oil pressure.

Try to add some oil or change the oil with bigger viscosity.

Jul 07, 2010 | Watts Onan Portable Generator - 4000 ,...

2 Answers

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

May 25, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan Generator stopped working in motorhome because the gas got too low. I blew out the front fuel filter,changed oil and filter, air filter, one spark plug and now it won't start. Is there a fuel shut...


Yes it wil not let you run your motorhome out of fuel they set it up that way so you dont strand yourself you may have a air bubble in the fuel line to the generator try blowing air generator fule line back into the tank

Jan 31, 2010 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Onan 4000 start good runs only ten minutsand shuts down,starts up


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.

Jun 07, 2009 | 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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