Reply
 
Thread Tools Display Modes
Old 07-31-2016, 03:11 PM   #1
Member
 
Join Date: Jan 2014
Location: Palm City, FL
Posts: 85
Genset Shutting Down In Heat

We traveled from Florida to Tennessee this month and the weather was so hot we had to run the Genset (Onan) late in the day so the cabin AC could keep our passengers cool.

We had a problem with the Genset in that it kept shutting down at odd times. For instance, if it was running at a rest stop, as soon as we got back out on the highway, it would cut out and would not restart for a while.

Has anyone else had this happen with their Genset? I am wondering if it could be vapor lock since everything downstream of the Ford engine got really hot.
__________________

__________________
hikerjohn7 is offline   Reply With Quote
Old 07-31-2016, 03:25 PM   #2
Senior Member
 
ilmor's Avatar
 
Join Date: Jul 2011
Posts: 754
I've read about others that had this problem, and it was apparently vapor lock. They added a vent to the generator thru the hatch so that cooler air is fed to it. I think Forest River even provided some to customers.
__________________

__________________
2017 Forest River Sunseeker 2250SLE
ilmor is offline   Reply With Quote
Old 07-31-2016, 03:44 PM   #3
World Wide Wanderer
 
wahoonc's Avatar
 
Join Date: Feb 2016
Location: Sprung Leak, NC
Posts: 1,017
Possibly a vapor lock or overheat situation. I had this happen to ours this past weekend, we stopped for a short doggy break and to hit up an ATM. It shut off right before we were ready to roll again. It started back up a couple of miles later. One thing is to make sure you have plenty of oil and consider going to a heavier duty oil. I use 30 wt in mine during the hotter seasons and it seems to help. These things run HOT, I have brown grass spots at home where I had it cranked up to run for a bit and was off the gravel parking pad. When you have temps in the 90's and you are on blacktop, it is going to be brutal for the generator. They are air cooled, and with 140°+ air you are going to get limited cooling.

I too have heard about the added vents from FR but have yet to see a comparison picture.

Aaron
__________________
Aaron & Rhonda
wahoonc & Airangel60

2016 Coachmen Concord 300DS
2015 Fusion Hybrid following along
wahoonc is offline   Reply With Quote
Old 07-31-2016, 06:14 PM   #4
Senior Member
 
RVnut's Avatar
 
Join Date: Aug 2015
Posts: 439
I will add that we had this happen a few times with our Generac on our last MH and it was due to a thermo switch that protected the generator when it got to hot from the temp of road and air.. I replace the switch and problem stopped.. I dont know if Onan has this switch too
__________________
364 Georgetown 2016
in Montana
RVnut is offline   Reply With Quote
Old 07-31-2016, 08:24 PM   #5
Member
 
Join Date: Dec 2015
Posts: 95
Is the generator shutting off or just the AC's?
__________________
2016 364TS
Kevin M. is offline   Reply With Quote
Old 08-01-2016, 08:22 AM   #6
Senior Member
 
kenandterry's Avatar
 
Join Date: Sep 2010
Location: Southern Ontario, Canada
Posts: 948
Kevin M......

The problem discussed here is with the generator shutting down.

I have the same problem with a Generac generator only when driving under hot conditions. When we're parked the genny runs fine. I suspect it's the increased heat coming up from the road pavement combined with the fuel sloshing around, possibly vapour lock of a simple carburetor design, or the low oil sensor tripping a shut down from the genny oil level sloshing around while driving.
__________________

Ken and Terry
2010 Georgetown 330TS being pushed by our
2017 GMC Terrain toad (4 wheels down)
kenandterry is offline   Reply With Quote
Old 08-01-2016, 08:35 AM   #7
Member
 
NCCoachMan's Avatar
 
Join Date: May 2016
Location: Charlotte, North Carolina
Posts: 66
Generator shutting off sounds like vapor lock.

Generator running but no power to coach sounds like transfer switch problem.

There are several conversations about these issues here. I wish we had some definitive answers.
__________________
NCCoachMan is offline   Reply With Quote
Old 08-01-2016, 09:31 AM   #8
Member
 
Join Date: Jan 2014
Location: Palm City, FL
Posts: 85
Genset Cut-Off

Quote:
Originally Posted by hikerjohn7 View Post
We traveled from Florida to Tennessee this month and the weather was so hot we had to run the Genset (Onan) late in the day so the cabin AC could keep our passengers cool.

We had a problem with the Genset in that it kept shutting down at odd times. For instance, if it was running at a rest stop, as soon as we got back out on the highway, it would cut out and would not restart for a while.

Has anyone else had this happen with their Genset? I am wondering if it could be vapor lock since everything downstream of the Ford engine got really hot.
Good feedbacks. Thanks.

I guess I will do some more research on the mentioned cut-off features in my Onan.
__________________
hikerjohn7 is offline   Reply With Quote
Old 08-01-2016, 01:20 PM   #9
Junior Member
 
Join Date: May 2014
Location: Floresville, Tx
Posts: 20
Fuel Pump

I just had this problem with mine and it was the fuel pump. Would run fine for a period of time and then shutoff. Thought it was temp related but then read about vapor lock due to low fuel pressure. Replaced it and both filters and runs great now. May not be your problem but have seen numerous post here and other blogs that indicate it is a pretty common problem.
__________________
kenlea98 is offline   Reply With Quote
Old 08-01-2016, 02:41 PM   #10
Junior Member
 
gizmo98's Avatar
 
Join Date: Jun 2016
Location: Canada
Posts: 21
I have 20 hours on my onan generator 4000 watt and a mechanic friend recommends replacing the oil with full synthetic swears by it and is great for changes in operating temperatures
__________________

__________________
Rob & Elizabeth Sweeney

Having fun in our Forester Gump (2015 3051S forester)
gizmo98 is offline   Reply With Quote
Reply

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




» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:23 AM.