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 > Help! Onan 4K generator refuses to start and stay on

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Dusty R

Charlotte Michigan 48813

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Posted: 11/20/20 08:37am Link  |  Quote  |  Print  |  Notify Moderator

Check to see if the electric fuel pump is working.

jdc1

Rescue, Ca

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Posted: 11/20/20 09:37am Link  |  Quote  |  Print  |  Notify Moderator

Kennyg wrote:

jdc1 wrote:

Time to clean the carb.....


Carb is only 2yrs old. Do you mean removing and cleaning??


Old gas gums up carburetors. It's the largest issue with small motors, including older motorcycles.

jdc1

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Posted: 11/20/20 09:40am Link  |  Quote  |  Print  |  Notify Moderator

Dusty R wrote:

Check to see if the electric fuel pump is working.


If you find the fuel pump isn't working, you can buy an off-the-shelf low psi fuel pump from any auto parts store. They are about $20.00, 1/4 the price of an Onan part.

cencerrita

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Posted: 11/20/20 10:11am Link  |  Quote  |  Print  |  Notify Moderator

jdc1 wrote:

Kennyg wrote:

jdc1 wrote:

Time to clean the carb.....


Carb is only 2yrs old. Do you mean removing and cleaning??


Old gas gums up carburetors. It's the largest issue with small motors, including older motorcycles.


Onan say you can not strip and clean their carbs - wrong! They are quite simple and compared to about $400 for new one worth doing!
There are photos of doing this in the book, Owners Essential RV Handbook

Unfortunatly I do not have any on this computer from when I did mine having forgotten the previous trip to drain my carb or run the fuel through with the fuel treatment I had added to the tank before storing. Previously having done this I stored for up to 6 months no problem compared to Onan saying you should "exercise" your onan every month to stop the problem.


www.cencerrita.comNow living in Pembrokeshire, Wales, UK. Seeour web site for US travels www.cencerrita.com


Dusty R

Charlotte Michigan 48813

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Posted: 11/20/20 10:38am Link  |  Quote  |  Print  |  Notify Moderator

We had an 01 Itasca MH. I added a switch to the generator fuel pump, and when I knew that we were not going to use it again for a while, I would turn the switch off and let the generator run out of gas.

wopachop

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Posted: 11/20/20 11:08am Link  |  Quote  |  Print  |  Notify Moderator

Kennyg wrote:

When it does start, it runs only briefly. It seems to me that it is not getting a constant flow of gas. Should I empty the "float bowl" to get clean gas
It could answer questions quickly. Be ready with the screwdriver and next time the genny dies crack open the float drain and see how much gas comes out.

If a lot of yellow looking gas comes out of the carb. Then it would be safe to assume you are getting enough gas to the carb. Mostly likely the problem is old gas, not lack of gas.

You can prime the system, crack the drain, and see how much gas comes out to get a feel for how much gas in is a full float bowl.

whemme

Spencer, IA

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Posted: 11/20/20 06:37pm Link  |  Quote  |  Print  |  Notify Moderator

Disconnect the fuel hose between the output of the generator’s electric fuel pump leading to the carburetor. Then hold down on the generator’s STOP button. This should turn on the fuel pump’s priming function and cause fuel to run out of the pump. No fuel - probably a bad fuel pump.

* This post was edited 11/20/20 06:48pm by whemme *


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azdryheat

Tucson, AZ

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Posted: 11/20/20 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

My genny did the same thing, start for a short period and stop. Cleaned out the carb and all is well. It's really very easy.


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