RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Tiffin Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 01-19-2009, 05:19 PM   #1
Junior Member
Join Date: Jan 2009
Location: Oregon / Arizona
Posts: 1
Our 8.5 kw Onan generator starts rough but then immeidately dies. We were using it and it was running fine and then just quit. Any ides?

Cactus Kids is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-20-2009, 02:42 AM   #2
Senior Member
paz's Avatar
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,716
Cactus Kids, welcome to iRV2.

The first thing I would check is the oil level in the generator. Onan generators have a protection system that shuts down the generator if the oil pressure is too low. The generator will try to start, but it will not run. The protection system is bypassed during starting since full oil pressure isn't developed until the generator gets up to speed. When the protection system kicks in, the generator shuts down.

Also, when was the last time the generator fuel filter was changed? Running rough and shutting down can also be a sign of fuel starvation which could be caused by a clogged fuel filter.

2015 DRV Tradition 375KPS
2015 Chevy Duramax 3500HD LTZ Dually
Full-timers...Home is where we park it.
Check out our blog: Living Our Dream
paz is offline   Reply With Quote
Old 01-20-2009, 03:55 AM   #3
Moderator Emeritus
Cruzer's Avatar

Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 5,075
All good information. Regarding the fuel filters, be aware that there are two of them. There's the Onan fuel filter inside the genset but Tiffin also adds a small inline fuel filter in the hose leading to the genset. If you extend the genset for service and lay underneath the coach you'll find that filter in the rubber fuel hose, about 3' back from the genset. It's generally cable tied up to the front crossmember immediately above and behind the genset. If the hose clamps are loose the fuel can drain out of the line and suck air in. Then when you fire up the genset you get a quick slug of air which can make it die. The inline filter is a standard filter, such as a Wix # 33031, which you can pick up at any auto parts store. It helps to have a vise grips handy to pinch off the fuel hose when you change that filter and also a new cable tie to hold the new filter in place.

If it's not in the fuel system, it would be an electronic shutdown. In that case you can retrieve the Onan shutdown codes by fiddling with the start-stop switch and counting the red light flashes. Refer to an Onan manual for that procedure.
Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
2012 Jeep Wrangler Unlimited - Rubicon
Cruzer is offline   Reply With Quote
Old 01-21-2009, 05:59 PM   #4
Senior Member
Dadeaux's Avatar
Tiffin Owners Club
Join Date: Jan 2009
Location: Orange Beach, AL
Posts: 744
As stated by Cruzer the fuel filters are the most likely culprit. Sounds exactly like mine and it was the inline filter installed by Tiffin.

Additionally, when the generator quits the light on your switch will blink a certain pattern which indicates the problem. It will repeat this pattern several times sort of like morris code. For instance, if memory serves me correctly, 'two blinks a pause and a single blink' indicates starving for fuel.

You can call any Onan shop and they can decipher the blinks for you.

Hope this helps.
Del & Charlotte
RVing - Time well wasted
2004 Phaeton 40TGH w/ 2010 Acadia
Dadeaux is offline   Reply With Quote
Old 01-22-2009, 09:18 AM   #5
Senior Member
Ken Lenger's Avatar
Join Date: Jul 2001
Location: Tucson AZ
Posts: 393
You can call any Onan shop and they can decipher the blinks for you.
The codes are also in the owner's manual.
2014 Winnebago Adventurer 32H
2011 Honda Fit Toad
Ken Lenger is offline   Reply With Quote
Old 08-23-2010, 09:29 PM   #6
Junior Member
Mainer's Avatar
Tiffin Owners Club
Join Date: Aug 2010
Posts: 5
I had a problem just like that with our 7.5 and it was the brush holder, 1 brush was burnt off. wuld start and when tranfer switch kicked in it would shut down.
Retired and Roughing it Smoothly
2007 Allegro Bay,35TSB
2011 Chev 1500 , Demco tow bar,Brake Buddy
Mainer is offline   Reply With Quote
Old 08-26-2010, 06:12 AM   #7
Senior Member
Tiffin Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 148
Blog Entries: 1
Whats the fuel level in your Coach?

Originally Posted by Cactus Kids View Post
Our 8.5 kw Onan generator starts rough but then immeidately dies. We were using it and it was running fine and then just quit. Any ides?
Check the fuel level in your coach. If its down to 1/4 of a tank the gen will not run. Thats a safety measure so if your boondocking somewhere you'll have enough gas left to get you to a station.


woodyk is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Genset Autostart Eddie Foy MH-General Discussions & Problems 5 07-06-2008 08:23 AM
Genset Autostart Gadget Man MH-General Discussions & Problems 6 05-01-2008 04:44 PM
Genset BillR38701 Winnebago Industries Owner's Forum 13 12-03-2005 08:59 AM
Genset Maintenance jhawthorne MH-General Discussions & Problems 3 11-18-2005 10:40 PM
ONAN GENSET Sunset 1 MH-General Discussions & Problems 6 11-04-2005 07:54 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:17 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.