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.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-02-2020, 08:27 AM   #1
Member
 
Alpine Owners Club
Join Date: Jun 2019
Posts: 74
Mechanical Fuel Pump 400 ISL 2006

My RV stalled after driving for over 90 minutes.

Apparently, the mechanic thinks my fuel filter was damaged by a rock or something that broke off the water drain cock. He then said as a result it damaged the mechanical fuel filter while it was struggling to run. Is that possible?

First it's almost impossible for something to hit the fuel filter because it is right behind the battery bay which hangs about 12" past the filter.

Any thoughts? Or did the mechanical pump just go out?
__________________

__________________
Ernie and Jonna Ortiz
Conroe, TX
2006 Alpine Coach Apex 40FD
Ernieo 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 07-02-2020, 08:53 AM   #2
Senior Member
 
Ljwt330's Avatar
 
Join Date: Jan 2018
Location: Capistrano Beach, California
Posts: 2,090
Quote:
Originally Posted by Ernieo View Post
My RV stalled after driving for over 90 minutes.

Apparently, the mechanic thinks my fuel filter was damaged by a rock or something that broke off the water drain cock. He then said as a result it damaged the mechanical fuel filter while it was struggling to run. Is that possible?

First it's almost impossible for something to hit the fuel filter because it is right behind the battery bay which hangs about 12" past the filter.

Any thoughts? Or did the mechanical pump just go out?

I assume the bold in your post is a typo and you meant to say "fuel pump."


Your year engine has a fuel pump with a low pressure, gear driven section that feeds the high pressure section. That gear driven section uses the fuel flow for lubrication and cooling. Loss of fuel flow, or significant air in the fuel, can lead to the failing of the pump.


Now, about the fuel filter. I don't know how your filter is mounted as in my Alpine, it is inside a bay that has a floor so it is not exposed to any external elements. If you filter is in an area that is open to the road, it is possible that it can be damaged by debris. Certainly, the mechanic should show you the filter and the damage.


I'm uncertain if your engine has one or two filters, but since the mechanic mentioned the water drain, the issue must be with the water separation filter which is located close to the ground as you describe.


If you read the link I posted in another thread to you, you will find that there are other reasons for the symptoms you have which may not be a failed pump. However, if you have a damaged filter, there is a good possibility that it led to a failed gear pump.
__________________

__________________
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
Ljwt330 is offline   Reply With Quote
Old 07-02-2020, 07:45 PM   #3
Registered User
 
Join Date: Jul 2014
Posts: 797
If your fuel filter is physically damaged that all the proof I would need. Is it?

As for your fuel delivery system I think you have a HPCR (High Pressure Common Rail) system. Also your 2006 coach probably has a 2005 Cummins ISL-400 in it which would definitely indicate an HPCR.

I'm no expert on the HPCR system, but here are some fuel flow diagrams that may help you follow what your diesel mechanic is talking about.

Most of the time you can trust their opinions, but it does not hurt to ask them to verify what they believe are your issues.

* These pictures show the backside and the front side of your ECM cooling plate and the electric lift pump behind it.

So if you fuel starvation problem is not caused by a damaged fuel filter, then you might be in need of a Fuel Lift pump... but as a general rule, if your engine starts it's not a lift problem. ...Also, your filter is remote mounted so don't let this diagram confuse you.
Attached Thumbnails
Click image for larger version

Name:	Cummins High Pressure Fuel Delivery System (LIFT PUMP).JPG
Views:	6
Size:	245.3 KB
ID:	291781   Click image for larger version

Name:	Cummins High Pressure Fuel Delivery System (LIFT PUMP)2.JPG
Views:	5
Size:	258.4 KB
ID:	291782  

Click image for larger version

Name:	Cummins Transfer Pump (aks Lift Pump).jpg
Views:	5
Size:	141.7 KB
ID:	291783  
imnprsd is offline   Reply With Quote
Old 07-02-2020, 10:19 PM   #4
Member
 
Alpine Owners Club
Join Date: Jun 2019
Posts: 74
Spoke with Cummins today. They said that a damaged fuel filter would not damage the fuel pump. That the engine would cough and then stop if air was coming in the system by way of the fuel filter. The engine never coughed it just stopped.
__________________
Ernie and Jonna Ortiz
Conroe, TX
2006 Alpine Coach Apex 40FD
Ernieo is offline   Reply With Quote
Reply

Tags
fuel, fuel pump, mechanic



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
Cummins ISL 400 Fuel Filters in 2006 Monaco szakaluk Class A Motorhome Discussions 2 01-07-2020 11:40 PM
1988 P30 KOMFORT 454 Mechanical Fuel Pump - Can't find 1/2 Inlet Pump... eo273 Vintage RV's 2 07-25-2016 11:42 AM
Are Cummins fuel and air filters the same? 350 ISL. compared to 400 ISL ? DGBPokes Cummins Engines 4 06-04-2015 05:40 PM
400 ISL vs 450 ISL Selah Cummins Engines 1 07-08-2013 06:48 AM
Cummins 400 ISL fuel pump problem htg3 Alpine Coach Owner's Forum 3 08-25-2005 04:46 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 01:27 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×