RV.Net Open Roads Forum: Class C Onan Generator Exhaust Stack Issue

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Class C Motorhomes

Open Roads Forum  >  Class C Motorhomes

 > Class C Onan Generator Exhaust Stack Issue

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Sponsored By:
Moonalisa99

Kentucky

New Member

Joined: 10/04/2021

View Profile



Posted: 10/04/21 07:36am Link  |  Quote  |  Print  |  Notify Moderator

We have a 2004 Class C with Onan Micro quiet 4000 generator. The generator only has 188 hours on it. Surging problem, tried Seafoam fuel cleaner first. Seemed to help, but when putting a load on generator would intermittently surge. So we replaced the carburetor (does seem to be running rich) & fuel filter, surging gone. Tested out several different times before going on trip. Would turn on A/C, ran perfect for extended periods, smooth, no surging. When we attached exhaust stack (cannot remember brand, but purchased from Camping World) at tailgating site, problems with generator dying was intermittent. Would run fine. Turned generator off for a period, would try to restart & problems. Noticed after we removed exhaust stack the generator would start right up, run fine. Any suggestions?

IB853347201

Eastern Ontario

Senior Member

Joined: 06/18/2018

View Profile


Offline
Posted: 10/04/21 08:44am Link  |  Quote  |  Print  |  Notify Moderator

Suggestions? Only one. Return the exhaust stack to Camping World for a full refund.


2010 Suncruiser

Moonalisa99

Kentucky

New Member

Joined: 10/04/2021

View Profile



Posted: 10/04/21 09:37am Link  |  Quote  |  Print  |  Notify Moderator

Could you expand on your comment? Is this from experience???

enblethen

Moses Lake, WA

Senior Member

Joined: 01/05/2005

View Profile






Posted: 10/04/21 09:56am Link  |  Quote  |  Print  |  Notify Moderator

Too much back pressure with the add-on exhaust stack


Bud
USAF Retired
Pace Arrow

2003 Chev Ice Road Tracker


IB853347201

Eastern Ontario

Senior Member

Joined: 06/18/2018

View Profile


Offline
Posted: 10/04/21 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Too much back pressure with the add-on exhaust stack

X2
And I believe I read somewhere that Onan does not recommend their use.
I used one once and had similar issues. Got rid if it quick. No more issues.

garyemunson

Reno, Nevada

Senior Member

Joined: 09/27/2015

View Profile



Good Sam RV Club Member

Offline
Posted: 10/05/21 07:19am Link  |  Quote  |  Print  |  Notify Moderator

A Genturi type stack is not going to cause the generator to "die". An Onan that intermittently shuts down then restarts OK after a while is almost ALWAYS a failing fuel pump. A known issue on these generators for many years. $20 on Amazon.

Moonalisa99

Kentucky

New Member

Joined: 10/04/2021

View Profile



Posted: 10/05/21 07:34am Link  |  Quote  |  Print  |  Notify Moderator

Thanks! I mistakenly said we replaced carburetor & it was the fuel pump & fuel filter. After replacing those the generator ran like a kitten. We went tailgating for 2 days & nights & generator would run for up to 3 hours. The problem was intermittent. We got home, I ran the generator for 2 hours while cleaning & reading for next trip, no issue, so I don’t think it is the new fuel pump or filter. The only thing different than when we ran it after replacement of pump & filter, was the stack & the oil showed a little low, we had topped it off. We have been advised to remove a pint of oil, dipstick level should be just above low mark. When oil heats up, expands & too much oil may be the issue. If it dies & restarts after 30 mins or so, gives oil time to cool back down. Makes sense. Will post if this helps.

hohenwald48

Nashville, TN

Senior Member

Joined: 07/27/2002

View Profile



Good Sam RV Club Member

Offline
Posted: 10/18/21 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Can you read the trouble code?

https://thecampingadvisor.com/onan-generator-fault-codes/


When seconds count, the police are only minutes away.

2019 Newmar Canyon Star 3627
2017 Jeep Wrangler JKU

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 

Open Roads Forum  >  Class C Motorhomes

 > Class C Onan Generator Exhaust Stack Issue
Search:   Advanced Search

Search only in Class C Motorhomes


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.