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

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Onan 4000 It starts but then shuts off right away and the red lite blinks 3 times. i have 195 hrs. on it have changed the oil and filters every 40 hrs. Could this be a case of old gas in the carb?

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Posted on Jan 02, 2017

erickg
  • 116 Answers

SOURCE: Oil type for Onan 4000 generator

SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Posted on Apr 17, 2009

  • 508 Answers

SOURCE: 4000 onan will start and run 5 to 10 minutes and

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

  • 691 Answers

SOURCE: Onan 4000 generator will not start. Charged

check the oil pressure switch, if it does not register it will also give a code and will not start.

Posted on Jul 17, 2009

  • 77 Answers

SOURCE: 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.

Posted on Aug 10, 2009

  • 6 Answers

SOURCE: Onan MicroQuiet 4000 Generator

Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Posted on Sep 28, 2009

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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 ,...

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 ,...

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.

Jul 22, 2009 | 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 ,...

1 Answer

Oil type for Onan 4000 generator


SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Apr 04, 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 ,...

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