Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  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 05-12-2022, 07:03 AM   #1
Junior Member
 
Join Date: Jan 2021
Posts: 5
Onan that hasn't been started in years...what should I do?

Just bought an old 2005 Jayco MH. Onan Generator hasn't been started in years and wasn't much used before then....in fact, I have no idea how much it was used. Should I just replace the air filter, fuel filter, spark plug, drain and add oil and try and start it up?

I am going to admit to not knowing much about these generators but I am handy and good at following instructions Any advice is welcome (even if it is to take it in to an authorized center). Thanks!
ngraysmith 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 05-12-2022, 07:13 AM   #2
Senior Member


 
Join Date: Feb 2017
Location: Denver, CO
Posts: 1,228
Thats what Id do. Id start it, let it run for 5-10 minutes if it sounds ok. Id probably change the oil again and then see if it puts out power.
__________________
2021 GMC Denali HD DRW Duramax
2021 Alliance Paradigm 310RL
BirchyBoy is offline   Reply With Quote
Old 05-12-2022, 07:15 AM   #3
Senior Member
 
Join Date: Mar 2019
Location: Lansing MI
Posts: 2,559
Quote:
Originally Posted by ngraysmith View Post
Just bought an old 2005 Jayco MH. Onan Generator hasn't been started in years and wasn't much used before then....in fact, I have no idea how much it was used. Should I just replace the air filter, fuel filter, spark plug, drain and add oil and try and start it up?

I am going to admit to not knowing much about these generators but I am handy and good at following instructions Any advice is welcome (even if it is to take it in to an authorized center). Thanks!

Since you are talking about spark plugs I would think this is a gasoline genny, if not please let us know. First things first. Doe it turn over? If yes I would check for spark. If you have spark I would try and start it. If it won't start I would see if it fires on starting fluid. If that works then I would see if it is generating electricity. Once you know everything is working then I'd do all of the maintenance you're thinking about. But I'm cheap and don't like spending money on something that may be junk.


Just a couple of thinks to think about. Most generator won't run on less that about 1/4 tank of fuel so the genny doesn't run the rig out of fuel. Make sure you have sufficient fuel. The other thing is there is generally an hour meter on the panel on the genny which should tell you how much use it's had. If it won't run and has spark my first suspect would be carburetor gumming. Good luck.
__________________
An Old Fisherman
2017 Nexus Ghost 36DS, 2004 Ford F150 Long Bed
2007 Harley-Davidson Ultra Classic
arcaguy is offline   Reply With Quote
Old 05-12-2022, 07:16 AM   #4
Senior Member
 
Boogie_'s Avatar
 
Join Date: May 2013
Location: SW Louisiana
Posts: 569
I would check the oil, drain any old gas, add some fresh (real) gas, and see if it runs. ...for just a few minutes.

Then start on all the maintenance.

If it doesn't run:
1. Check for spark/plug/ignition switch circuits.

2. Good fire, then check fuel supply, filter/hoses, pull the carb out for cleaning/overhaul/replacement.
__________________
A bunch of salvage title junk I rebuilt
Boogie_ is offline   Reply With Quote
Old 05-12-2022, 07:19 AM   #5
Senior Member
 
Join Date: Sep 2020
Posts: 1,079
If youre mechanically inclined, drain the carb and or take it apart and clean it. If it hasnt been run in 3 years or so, its will most likely be gummed up. You might get lucky though, and trying to start it shouldnt hurt.

Shooting some wd40 down the spark plug hole may help.
bpu699 is offline   Reply With Quote
Old 05-13-2022, 05:51 PM   #6
Senior Member
 
Ford Super Duty Owner
Join Date: May 2006
Location: Near St Louis, MO
Posts: 294
I bought a replacement carburetor off eBay for my 4000w Onan. The price won't break the bank.
https://www.ebay.com/itm/254817311309
$29.74/free shipping and 99% positive rating.
(Make sure the one you buy fits your application.)
DFord is offline   Reply With Quote
Old 05-13-2022, 09:39 PM   #7
Senior Member
 
Isaac-1's Avatar
 
Join Date: Jun 2016
Location: SW Louisiana
Posts: 7,275
Note those $29 carburetors are made in China clones, and quality varies from slightly inferior to the genuine Onan carburetors (which retail for around $300), to absolute junk.


p.s. The genuine Onan carburetors are mostly made in Japan by Nikki
__________________
2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
Isaac-1 is offline   Reply With Quote
Old 05-14-2022, 09:07 AM   #8
Senior Member
 
Boogie_'s Avatar
 
Join Date: May 2013
Location: SW Louisiana
Posts: 569
I've had nothing but years of good use out of the half dozen or so Chinese carburetors I got off eBay.

I think the problem most folks are having with them is the needle valves are almost never preset.
If you're not familiar with 2-stroke engine tuning I can see where it could b frustrating.
__________________
A bunch of salvage title junk I rebuilt
Boogie_ is offline   Reply With Quote
Old 05-14-2022, 10:34 AM   #9
Senior Member
 
Join Date: Jan 2009
Posts: 3,777
Quote:
Originally Posted by bpu699 View Post
If youre mechanically inclined, drain the carb and or take it apart and clean it. If it hasnt been run in 3 years or so, its will most likely be gummed up. You might get lucky though, and trying to start it shouldnt hurt.

Shooting some wd40 down the spark plug hole may help.
Checking the oil level and draining the bowl would be the two things I'd do before trying to start.

I would hit the prime button and listen for the pump to run for about 30 seconds to hopefully fill the bowl back up. Then try cranking to see if the thing starts. If no start, then look to find out if it's an ignition or fuel delivery problem. I'd bet a carb issue and if so, might be a good time to confirm with a quick shot of starting fluid through the carburetor throat.
__________________
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
Mudfrog is offline   Reply With Quote
Old 05-14-2022, 04:01 PM   #10
Senior Member
 
ernieh's Avatar
 
Join Date: Jul 2009
Posts: 1,698
IMO, if it hasn't been run for years and the gas wasn't drained, there is a very good chance that the carb is gummed up. All you can do is try.
__________________
ernieh
2019 Phaeton 37BH
ernieh is offline   Reply With Quote
Reply

Tags
onan



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
Best way to sell coach that hasn't been registered in 7 years? Z Squared Class A Motorhome Discussions 64 04-18-2022 05:31 AM
After almost 3 years why hasn't NEWGLE been the answer tom chelbana Newmar Owner's Forum 54 09-18-2019 08:23 AM
Hurry, the view hasn't been this good for 24 or more years. Little Kopit Canada Region 3 06-03-2007 11:12 AM
So, really, how long has it been (it may feel like it but it hasn't been forever) Starship Just Conversation 38 03-06-2006 02:22 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 02:14 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.