Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Caterpillar Engine 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 12-02-2022, 12:51 AM   #29
Junior Member
 
Join Date: Jan 2011
Location: Full Timer
Posts: 29
Send a message via Skype™ to Troglegs
Not All CAT3126E Engines are spec’ed out the same!

I see a lot of comments from folks implying that if you don’t see a second filter under the bed you’ve missed something and I can assure you that is 100% NOT TRUE. I own a 2003 Alfa Leisure SeeYa 38’ Coach with a Cat 3126E and I know for sure my Alfa has ONE SOLITARY fuel filter and water separator single unit in the back by the radiator. On my build my 2002 Freightliner Custom Chassis was delivered to Alfa with ONE filter, supposedly a 2 Micron Filter. I hate this inconsistency caused by Freighliner or Caterpilar… I have friends with C7 Engines and they’ve got the dual filters - yes - two filters, even though one has a fuel water separator, they’re both fuel filters… one is 10 micron and the other only 2 micron. A recent discussion with a fellow Alfa SeeYa owner who originally had only ONE filter on his 3126E supposedly said it can cause premature failures on the HUEI Pump / Injectors… since the 2 micron is restrictive in size…. So he had a shop in Sacramento CA modify his engine to add the second filter and then he added a priming pump and a custom mount for it on the radiator where the original single filter was. I would love to find a true Cat expert who can put this “one versus two - which is better” discussion to bed for good. It’s real frustrating not knowing which micron level filter to use on my coach… and often I have caught mechanics installing the wrong size micron filter on my coach and had to make them change it. Frustrating indeed, seems like there is no standard. Oh well.
Troglegs 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 12-02-2022, 05:03 AM   #30
Junior Member
 
Jay2002's Avatar
 
Join Date: Oct 2020
Posts: 2
I've run into this before on fleet trucks with that eng. If we used any filter other than the CAT fuel filter, performance suffered. Good luck
Jay2002 is offline   Reply With Quote
Old 12-02-2022, 04:29 PM   #31
Member
 
Join Date: Aug 2020
Posts: 30
Filters

My 3126 has two filters. One with the water separator which is easily accessible so I can drain the water at every fill up and the other one is on top of the engine toward the front of it which is accessible in my coach under the bed. On my coach that is the one that has a small primer pump. I had a very poorly running engine until I found that other filter and changed it and use the primer pump to fill it. It was a long drawn out ordeal but I have not missed a beat since then.
Quote:
Originally Posted by Phaeton04 View Post
Yes, the engine was running great before I changed the filter.
The filter was last changed last year in November. I prefilled the filter with fuel. I have no Primer handle. I have the 3126E HEP20882 Cat, that has only (1) fuel/water separator filter.
I do not see or smell any fuel leaks.
azlandman is offline   Reply With Quote
Old 12-02-2022, 04:40 PM   #32
Senior Member
 
Join Date: Oct 2014
Posts: 6,314
OK, STOP!


Some Freightliner chassis have TWO fuel filters, some have ONLY ONE!

A quick call to Freightliner with your VIN will give you the answers.


Yes, for some chassis model years, the BEAN COUNTERS got involved and decided that only a single filter was needed.

Remember, the engine manufacturer did not spec the NUMBER of fuel filters, only the micron rating that it had to be filtered to.

IMO (yes IMO) if I owned one of the "single fuel filter" chassis, I would add a second one:

Primary fuel filter (between tank and lift pump) a fuel filter/water separator with course element (10-30 micron).

Then after lift pump a 2 micron element (assuming that is the micron rating require for your particular engine/injection system.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
wolfe10 is online now   Reply With Quote
Old 12-04-2022, 01:24 AM   #33
Cat
Senior Member
 
Join Date: Jan 2005
Posts: 1,387
Quote:
Originally Posted by Troglegs View Post
I see a lot of comments from folks implying that if you don’t see a second filter under the bed you’ve missed something and I can assure you that is 100% NOT TRUE. I own a 2003 Alfa Leisure SeeYa 38’ Coach with a Cat 3126E and I know for sure my Alfa has ONE SOLITARY fuel filter and water separator single unit in the back by the radiator. On my build my 2002 Freightliner Custom Chassis was delivered to Alfa with ONE filter, supposedly a 2 Micron Filter. I hate this inconsistency caused by Freighliner or Caterpilar… I have friends with C7 Engines and they’ve got the dual filters - yes - two filters, even though one has a fuel water separator, they’re both fuel filters… one is 10 micron and the other only 2 micron. A recent discussion with a fellow Alfa SeeYa owner who originally had only ONE filter on his 3126E supposedly said it can cause premature failures on the HUEI Pump / Injectors… since the 2 micron is restrictive in size…. So he had a shop in Sacramento CA modify his engine to add the second filter and then he added a priming pump and a custom mount for it on the radiator where the original single filter was. I would love to find a true Cat expert who can put this “one versus two - which is better” discussion to bed for good. It’s real frustrating not knowing which micron level filter to use on my coach… and often I have caught mechanics installing the wrong size micron filter on my coach and had to make them change it. Frustrating indeed, seems like there is no standard. Oh well.
Two filters are better even more so in dusty conditions. Caterpillar found that the filter media for 2 micron could be damaged by larger 20-micro and larger particles. What happens is the larger particles would be collected by the 2 micron filter. But the pressure differential between the fuel coming into the filter/outside of the media and the inside of the media could and did push the larger contaminates through the filter media. So injectors were being wiped out. Also the 2 micron filtered out more so it would plug up sooner- which made the problem of pressure differential on the media worse. Caterpillar did retrofit 20 Micron filters on machines or engines that worked in very dusty conditions.So After learning that all heavy equipment engines have 2 filters. And after Caterpillar went common rail fuel systems they even went to three filters on some/quite a few engines.
So two filters are better but the environment a rv runs in is much cleaner. Want to kill a set of injectors? pre fill the filters incorrectly.

Safe travels
Cat is offline   Reply With Quote
Reply

Tags
cat, fuel, fuel filter change, power, power loss



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
Change final fuel filter - Cat 3126e - with primer pump dansawyer Caterpillar Engine Forum 15 10-12-2022 10:30 AM
Cat Spartan 3126e first water separator fuel filter replacement dansawyer Caterpillar Engine Forum 2 04-08-2022 02:11 PM
You just can't have enough fuel filter change stories, DSDP 3126E CAT dbywaters Newmar Owner's Forum 16 08-12-2015 03:35 PM
Cat 3126E fuel filter/water seperator RKL2 Winnebago Industries Owner's Forum 4 08-21-2006 12:55 PM
CAT 3126E Oil Filter RedT Winnebago Industries Owner's Forum 7 02-18-2005 01:05 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 09:19 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.