Thread Tools Display Modes
Old 06-22-2013, 01:30 PM   #1
Join Date: Apr 2013
Posts: 42
Cummins Onan RV QG 4000 over revving

Hi All,

I have an an Onan 4000 with only 8 hrs of running time on it. I'm far from a service location so trying to trouble shoot the issue on my own.

The first 8hrs ran great. Now it will only start and run if I manually manipulate the choke. While I do this, the generator keeps revving high even if I am barely keeping it running then dies as soon as I stop "choking" it.

Any ideas?
(governor? Limite screw? ....?


grega is offline   Reply With Quote
Old 06-22-2013, 03:25 PM   #2
Join Date: Oct 2008
Location: Central Louisiana
Posts: 90
Might be bad gas.

drc343 is offline   Reply With Quote
Old 06-29-2013, 12:42 AM   #3
Join Date: Apr 2013
Posts: 42
Problem fixed

I was finally able to take the unit into a Cummins Onan Servicer. Luckily the unit is still new (<90 days). The shop pulled out the existing carb and put in a new one, all under warranty (i.e. $0). Apparently the dealer didn't run it enough and let the gas just sit there.. shame on them!

The generator now runs perfect, thanks to Industrial Equipment Repair (Sparks, NV)
grega is offline   Reply With Quote
Old 06-29-2013, 12:45 AM   #4
Senior Member
wyo700's Avatar
Join Date: Jul 2012
Posts: 896
And make sure for now on if you can only use gas that is ethanol free. That will save you some major headaches in the future. If you can not find ethanol free gas get a bottle of sea foam and add the entire bottle to your tank that the gen run off of.
2012 Sandstorm 203slc
2013 Toyota Tundra
Eqil-l-izer hitch,Prodigy P3
2014 Honda Pioneer 700-4
2004 Yamaha Grizzly 660
wyo700 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:28 PM.