Reply
 
Thread Tools Display Modes
Old 08-16-2013, 04:08 PM   #11
Member
 
Join Date: Jul 2013
Posts: 94
Just received a call from the Cummins/Onan service center- Fuel pump replaced with a newer model and all is well!!! A/C starts and runs just fine. I will pick it up on Monday and if I can get any serial #'s I will pass them along.

Denny
__________________

__________________
DennyH is offline   Reply With Quote
Old 08-20-2013, 08:10 AM   #12
Member
 
Join Date: Jul 2013
Posts: 94
I guess I spoke too soon!! When I got the MH back home the same problem persists!!!! The gen does run much smoother but the A/C will not run. As soon as I switch the A/C on the gen quits. The guys at the Onan repair center put a load bank on the generator to simulate the the load and it passed so it does not appear to be a generator problem. I guess I have a different problem. Hmmmmmm! Very disgusted!
__________________

__________________
DennyH is offline   Reply With Quote
Old 08-20-2013, 08:32 AM   #13
Senior Member
 
Join Date: Apr 2011
Posts: 313
It still sounds like a generator problem. Even if there was an issue with the a/c pulling to much amperage, it would trip a breaker before shutting the genny down.
__________________
Acableguy06 is offline   Reply With Quote
Old 08-20-2013, 09:11 AM   #14
Senior Member
 
Join Date: Jul 2013
Location: Baton Rouge
Posts: 492
Quote:
Originally Posted by trwmodela View Post
I wonder if there is a serial number range that applies to the Onan fuel pumps. Also, what replacement pump is being installed? Some have commented that their replacements failed.
Mine was OEM. I don't know that Onan has a full grasp of what "lot" is affected. Some units do fine, some don't.
__________________
bgilly is offline   Reply With Quote
Old 08-20-2013, 09:34 AM   #15
Tinkerer and Putterer
 
Join Date: Mar 2013
Posts: 334
I know that a UPS in the computer world can often pass a simulated load test when the load is introduced gradually and fail when the same load is applied suddenly. I'm wondering if this is what is happening here. I know when I turn on my AC the lights brown out and the generator bogs down so I'm sure that the AC is pretty close to maxing out the surge capacity of our 4 kw Onan ultra quiet unit. Didn't have the same behavior from an older / louder Onan genset of the same rating. One thing I did do that helped smooth the operation of the generator and ease the strain from AC cut in was change the oil over to 5W30 synthetic in place of the 30W that came from the factory. The cost was minimal (10.00). The manual recommended the switch to get the broadest operating range and I noticed a difference in startup and load handling.

Another thing to try is to shut off everything, switch the fridge to gas, turn on the blower/AC fan, and then try the AC. If the genset handles the switch over then you are probably looking at a problem with the generators ability to handle sudden loads or possibly a bad / loose ground on the genset itself.
__________________
HappyGuy is offline   Reply With Quote
Old 08-20-2013, 09:55 AM   #16
Senior Member
 
Join Date: Nov 2012
Location: X
Posts: 2,781
Quote:
Originally Posted by Acableguy06 View Post
It still sounds like a generator problem. Even if there was an issue with the a/c pulling to much amperage, it would trip a breaker before shutting the genny down.
That is not the commonly reported experience.
__________________
BarryD0706 is offline   Reply With Quote
Old 08-20-2013, 10:23 AM   #17
Senior Member
 
Join Date: Jul 2013
Location: Baton Rouge
Posts: 492
Quote:
Originally Posted by DennyH View Post
I guess I spoke too soon!! When I got the MH back home the same problem persists!!!! The gen does run much smoother but the A/C will not run. As soon as I switch the A/C on the gen quits. The guys at the Onan repair center put a load bank on the generator to simulate the the load and it passed so it does not appear to be a generator problem. I guess I have a different problem. Hmmmmmm! Very disgusted!
Have you tried the air conditioner on shore power? Check it on shore power and check the amperage. It should hover around 15 amps with fan on high and compressor running.
Dometic states generator size required for these units is 3500 watt. The Onan 4000 is plenty.
Might check the voltage output of the generator. A loadbank doesn't care much about voltage but that Dometic A/C will.

Bobby
__________________
bgilly is offline   Reply With Quote
Old 08-20-2013, 10:25 AM   #18
Senior Member
 
Join Date: Apr 2011
Posts: 313
Quote:
Originally Posted by BarryD0706 View Post
That is not the commonly reported experience.
Ok, are the newer Onans set up to shut down on overload then?

In my experience with most generators on overload, the breaker on the genny should open before engine stalls due to running out of power. Unless the generator is severely over rated or to large of a gen end is put on a small motor. If an over load is shutting down an engine under load this would not be good on the voltage regulator either. Unless this is a function in the generator to just shut down with an overload.
__________________
Acableguy06 is offline   Reply With Quote
Old 08-20-2013, 10:51 AM   #19
Senior Member
 
John McClain's Avatar
 
Join Date: Jan 2013
Location: Ventura
Posts: 166
Is their a fault light blinking on the Gen start switch ?
__________________
F-250 . stealth 3210 solar pannels, fantastic fans. and life line batteries
John McClain is offline   Reply With Quote
Old 08-20-2013, 03:39 PM   #20
Member
 
Join Date: Jul 2013
Posts: 94
Lets see... Everything, including the A/C works on shore power. The generator runs fine on fan, both hi and lo, Microwave, etc. Just quits when A/C compressor comes on.
Another question- Where is the converter/charger on the 3011?? My house batteries are dead and will not charge over 11.93 volts.

Thanks
__________________

__________________
DennyH 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.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:34 PM.