RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Cummins Engines
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 08-19-2019, 04:29 PM   #1
Junior Member
Join Date: Aug 2019
Posts: 2
Intermittent power issue on 2002 Monaco Windsor lift pump

I have a 2002 Monaco Windsor that will intermittently not start due to power not getting to the lift pump. This has caused an issue several times and the coach is currently stuck in Wyoming at a Cummings repair shop. Incidentally the coach has been at Cummings for over a week and I'm trying to get back to Georgia sooner than later.

During my last trip to Cummings they could not recreate the issue and said the pump checked out and updated some type of software on the computer.

Does anyone know if there is a relay that could possibly be sticking? If so, could you please identify the relay?

Thank you in advance for any help!


Mblake1 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 08-19-2019, 10:23 PM   #2
Senior Member
Smitty77's Avatar
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 4,376
First, welcome to IRV2 - and great era for Monaco Windsor'sL)!

Second. Clean all of the electronic connections to the Lift Pump. Have someone else turn on the key, and make sure you hear if it's kicking on.

I'll assume that a Cummins shop will know that 2002 CAPS era Lift Pump fed ISC's and ISL's - had known problems gasket leaks from the shift to ULSD(?). So normal diagnostics should look for any signs of leakage, and or excess air getting in via the short period of time the Lift Pump is running.

No real rocket science on Lift Pumps. Key goes on, juice flows to the Lift Pump to say run and lift the fuel to the CAPS - and boom X's 6 Cylinders as the engine fires up. The Lift Pump's time is complete on the lifting of fuel at start up - and power shuts off, and it goes dormant. The CAPS takes over and 'sucks/vacuums' the fuel it needs to send on down to the cylinders.

It's either on, or off, or failing when on due to air leakage, or intermittent electric juice.

Best of luck to you, and please comeback and share the final outcome, as it could help someone else in the future.

Travel safe, have fun,

Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
Smitty77 is online now   Reply With Quote
Old 08-20-2019, 07:07 PM   #3
Senior Member
TR4's Avatar
Join Date: May 2016
Location: San Francisco Bay Area, California
Posts: 539
Looking at a wiring schematic for my coach, the lift pump gets power directly from the ECM. I would think you would get a CEL if power was not detected. Since itís at Cummins, theyíll probably just replace the lift pump. Could be a bad ECM, but not likely. Let us know what they find and welcome to irv2.

2003 Country Coach Intrigue 36'
Cummins ISL 400
TR4 is offline   Reply With Quote
Old 08-21-2019, 06:04 AM   #4
Senior Member
Monaco Owners Club
Join Date: Sep 2013
Posts: 1,509
Not uncommon for the pump motor to be intermittent, it is just a 12 volt motor with brushes.
2007 Monaco Signature Noble III 45' ISX 600HP
hypoxia is offline   Reply With Quote
Old 08-22-2019, 06:03 AM   #5
Senior Member
ladagobago's Avatar
Winnebago Owners Club
Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver -Winter Englewood FL, Summer Willingboro NJ
Posts: 1,320
Blog Entries: 11
I would be looking at the ecm connections and also there should be a fuse in line that might be intermittent. I have seen fuses look good and test good but still be defective.
La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with 1972 V12 XKE Jag and HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
ladagobago is offline   Reply With Quote
Old 08-27-2019, 05:26 PM   #6
Junior Member
Join Date: Aug 2019
Posts: 2

Thank you all for your input! In the end the Cummings mechanic found the issue, which was a lose wire. The wire that was lose is shown in the picture I'm trying to attach. It was located in the box on the side that houses the on off switches for the batteries.
Attached Thumbnails
Click image for larger version

Name:	Capture.JPG
Views:	8
Size:	49.1 KB
ID:	258237  
Mblake1 is offline   Reply With Quote
Old 08-28-2019, 09:10 AM   #7
Senior Member
TR4's Avatar
Join Date: May 2016
Location: San Francisco Bay Area, California
Posts: 539
Thanks for reporting back. Did they tell you what the wire or relay controlled?


2003 Country Coach Intrigue 36'
Cummins ISL 400
TR4 is offline   Reply With Quote

monaco, power, wind

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
Monaco Windsor :: 2005 Monaco Windsor Frankintx iRV2 Owners Registry 0 06-06-2019 04:01 PM
Monaco Windsor :: 2005 Monaco Windsor Frankintx iRV2 Owners Registry 0 06-06-2019 04:00 PM
2002 Diplomat 8.3 Fuel Pump/Lift Pump Mutt Monaco Owner's Forum 8 01-15-2019 06:57 PM
Monaco :: 2002 Monaco Windsor Carell iRV2 Owners Registry 0 10-19-2016 03:36 PM
Electrical issue 2002 Monaco Windsor 62galaxie Monaco Owner's Forum 5 12-31-2015 02:24 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:48 AM.

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