Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's Forum
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 04-28-2017, 11:21 PM   #1
Member
 
Join Date: Apr 2017
Posts: 52
Fuel Filters to fill or not to fill?

Going to change the primary and secondary fuel filters on the old2000 Windsor (1999 engine) in the morning, and am finding conflicting opinions to fill or not to fill the filters with clean fuel before installation. I have always filled the filters on most other diesel engines so why not the 8.3 isc? Oh by the way what order would you change then primary first or vise a versa?
moparglley 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 04-28-2017, 11:36 PM   #2
Senior Member
 
10Boomer's Avatar


 
Join Date: May 2012
Posts: 2,933
I do it
__________________
Perry & Julie: 2008 Monaco Camelot 40PDQ, 400ISL, Toad; 2015 Chevy Equinox.
10Boomer is offline   Reply With Quote
Old 04-29-2017, 12:10 AM   #3
Senior Member
 
Tiffin Owners Club
Freightliner Owners Club
Join Date: May 2015
Posts: 115
Fill um up.
Sjg1277 is offline   Reply With Quote
Old 04-29-2017, 01:51 AM   #4
Senior Member
 
guardrail53's Avatar
 
Monaco Owners Club
Vintage RV Owners Club
Join Date: Sep 2014
Location: anywhere U.S.A, Currently back home in Thailand!
Posts: 4,014
I have never understood why, other than the filter sitting sideways, you would not fill it up? Why would you make your lift pump do it when it is so easy to fill and screw it on? Fill it! Rail!
__________________
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"
guardrail53 is offline   Reply With Quote
Old 04-29-2017, 04:25 AM   #5
Senior Member
 
Join Date: Jul 2014
Posts: 28,594
Quote:
Originally Posted by guardrail53 View Post
I have never understood why, other than the filter sitting sideways, you would not fill it up? Why would you make your lift pump do it when it is so easy to fill and screw it on? Fill it! Rail!
To help you understand, the manufactures don't recommend filling them, because they don't want unfiltered fuel poured in them.

I suppose there has been instances where someone got some dirty fuel, or container, and filled the filter. The dirt went directly to the injectors and ruined them.

I once watched a mechanic, in our shop, fill the new filter with the fuel from the old one. Ugggh.
twinboat is offline   Reply With Quote
Old 04-29-2017, 05:29 AM   #6
Senior Member
 
RamiDav's Avatar
 
Join Date: Jan 2016
Posts: 1,754
You can fill them , just us clean diesel and pour it into the small holes
not the center hole this way it still gets filtered .

To make it a little easier get a threaded plastic pipe nipple that will screw
into the center hole then pour away .

Some people and shops fill them with transmission oil , its clean and quick .

Ray
RamiDav is offline   Reply With Quote
Old 04-29-2017, 05:43 AM   #7
YC1
Senior Member
 
YC1's Avatar


 
Holiday Rambler Owners Club
Join Date: Jun 2011
Posts: 9,506
I don't car what my manual says. Mine will not run without filling them. I think the routing of my hoses lets so much fuel drain back into the tank that it cannot overcome that. Just my humble opinion. I have considered installing a check valve but it is easy to pr-fill them and then they take right off.
__________________
Myron & Deborah
08 HR Endeavor 40 SKQ
400 Isl, 400 HP/// Now 450 HP
2016 Ford F150 Limited V6 with Ready Brake
YC1 is offline   Reply With Quote
Old 04-29-2017, 05:53 AM   #8
Senior Member
 
HHIDan's Avatar
 
Join Date: Mar 2011
Location: Ottawa Ontario Canada
Posts: 1,260
The lift pump, also called the transfer pump, (12 volt pump, now mostly located in the fuel tank) runs for about 15 seconds when you turn the key to pump the fuel up to the filters. When you start to crank the engine, then the mechanical fuel pump takes over and the electric lift pump is no longer running.

Change your (one or two) filters and then turn your key on and off five times then you can check your second fuel filter should be mostly full. (That is how you test your lift pump is working) You can actually hear that pump.. This way, no fuel goes into injectors unfiltered. Engine should then start normally, (with maybe more cranking than usual).
__________________
DanielB
Looking for small Class C, sold Newmar MADP
HHIDan is offline   Reply With Quote
Old 04-29-2017, 05:57 AM   #9
Senior Member
 
hardy1000's Avatar
 
Monaco Owners Club
Join Date: Feb 2009
Posts: 1,492
Fill it up
__________________
Del & Lori 2007 Diplomat 40PDQ - 2020 Grand Cherokee TrailHawk Hemi Toad, M&G Brake System, Blue Ox.
hardy1000 is offline   Reply With Quote
Old 04-29-2017, 06:02 AM   #10
Senior Member
 
Join Date: Jul 2014
Posts: 28,594
Do as you have been doing, but if your system can not fill the filters with the lift pump, there is an air leak in the plumbing before the pump or the pump is weak.

It's simple science. The pump creates a negative pressure. Something has to move towards it. Air is easier to move then fuel. Lift height can effect it but not distance.
twinboat is offline   Reply With Quote
Old 04-29-2017, 06:55 AM   #11
Senior Member
 
Monaco Owners Club
Join Date: Feb 2016
Posts: 1,015
Quote:
Originally Posted by HHIDan View Post
The lift pump, also called the transfer pump, (12 volt pump, now mostly located in the fuel tank) runs for about 15 seconds when you turn the key to pump the fuel up to the filters. When you start to crank the engine, then the mechanical fuel pump takes over and the electric lift pump is no longer running.

Change your (one or two) filters and then turn your key on and off five times then you can check your second fuel filter should be mostly full. (That is how you test your lift pump is working) You can actually hear that pump.. This way, no fuel goes into injectors unfiltered. Engine should then start normally, (with maybe more cranking than usual).
I am fairly certain your lift pump runs continuously after the engine starts. It is my understanding that if the lift pump malfunctions and the injection pump has to draw the fuel itself it can cause significant damage. I understand that some lift pumps may cycle off when the engine is not running and the key in is the run position. Mine runs continuously regardless of whether the engine is running or not.

I always fill my filters with diesel. I have read where some just cycle the key and let the lift pump fill the filters but there is air in the filters. Where does this air go? If you leave the filter loose so the air can bleed off while the filter fills with fuel then that would make more sense to me. I just did not want that air traveling though my injector pump. I was a heavy equipment mechanic for 12 years and have changed hundreds of fuel filters and I always filled them first unless they had a hand/primer pump on the filter housing. All the ones that had a hand/primer pump also had an air bleed at the top.
BigLar368 is offline   Reply With Quote
Old 04-29-2017, 06:58 AM   #12
Community Administrator
 
Spk64's Avatar


 
Newmar Owners Club
Join Date: Apr 2014
Location: Southern Indiana
Posts: 17,278
Fuel Filters to fill or not to fill?

I follow the manual which states to install dry. Our ISL has the electric lift pump so just cycle the key a few times (per the manual) and filter is filled. So far I have not had any problems doing this.
__________________
Steve
2002 Newmar Mountain Aire 4095
Spk64 is offline   Reply With Quote
Old 04-29-2017, 07:56 AM   #13
Moderator Emeritus
 
barmcd's Avatar


 
Monaco Owners Club
Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,267
I don't prefill. I turn the key on and let the lift pump run several times before starting the coach. It always starts right up after that.
__________________
Dennis and Katherine
2000 Monaco Dynasty
barmcd is offline   Reply With Quote
Old 04-29-2017, 08:15 AM   #14
Registered User
 
Join Date: Nov 2005
Posts: 6,749
Chicken or egg--don't know whether lift pump runs continuously or not, but it does shut-off after approx. 15 seconds if you don't start engine. I only have one filter on my 03 ISL 400. My filter mount has a set-screw vent on top so I can vent trapped air. Once pressure to injector pump is attained, lift pump recirculates fuel back to tank so any trapped air is simply returned to tank. IMHO--prefilling a filter creates opportunity for contamination--14 years and 170,000 miles, never had an issue with using lift pump to fill filter.
Old Scout is offline   Reply With Quote
Reply

Tags
fuel



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
Filters - Filters - Filters Where do you get your filters???? Busskipper Class A Motorhome Discussions 14 03-20-2017 09:01 AM
Filters, filters and more filters tbbg II Newmar Owner's Forum 3 09-02-2015 09:00 AM
How many fuel filters in my coach and would old filters cause overheating? 4tfamily Cummins Engines 21 08-06-2014 03:21 PM
Changing oil, filters, and fuel filters on 2006 Alegro Bus randyf Tiffin Owner's Forum 2 06-01-2011 08:02 PM
Water filters, Don't need no stinkin' filters. Larry Geese Monaco Owner's Forum 10 05-08-2010 08:20 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 12:32 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.