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Old 05-23-2021, 01:11 PM   #1
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Cat 3126 fuel filters... where’s the logic?

So just getting ready to order filters for my 2000 Winnebago ultimate advantage...

2 fuel filters...

One very easy to get to by the radiator... a 20 micron filter Fleetgaurd 55020...

One, a 3 um Donaldson 551315... buried in the engine bay...

Why is only one fuel filter designed to be accessible??? Why not both???

If your fuel filter gets plugged on the side of the road, are you only expected to change the one filter?


Also, CAT specs a 2 um filter...

Yet, the freight liner repair dealer put in what you see above for the previous owner...

Do you guys know what the CAT filter part numbers are? Reliable source to order?

Or, is the fleetgaurd and Donaldson stuff ok?
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Old 05-23-2021, 01:24 PM   #2
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While you are checking for the proper 2 micron filter, you want to see if the secondary fuel filter head is Caterpillar (yellow) and if so, if it has a manual primer pump. Or if Cat head and no manual pump is the a block-off plate held by two bolts so you could install a Caterpillar manual primer pump.
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Old 05-23-2021, 02:05 PM   #3
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I believe there is a manual fuel pump, but it’s been a while since I had the bed up...

So, do most folks just change one fuel filter?

Also, I see my setup doesn’t have a water/fuel separator?

Looks like the CAT 2 micron filter is 1R0751...
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Old 05-25-2021, 05:19 AM   #4
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Cat 3126 fuel filters... where’s the logic?

These are the caterpillar parts I used:
105-2508 Primer Pump
1P-0436 Gasket
8C-6561 Bolt
7Y-2501 Bolt
8T-4205 Washer
8T-4224 Washer

Suggest you call CATERPILLER with your engine serial number to verify.
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Old 05-25-2021, 06:13 AM   #5
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Thank guys, I believe I already have the pump. Was looking for the serial number for the primary CAT fuel filter, or input on continuing to use the Fleetgaurd. The filter on there now is a 20 micron, labeled, sold primarily for agricultural equipment...

Doing lots of googling suggests that for a couple years CAT didnt place a fuel/water seperator on these engines, just 2 fuel filters...

When using the hand pump... any tricks? Or just put on 2 filters dry and pump?
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Old 05-25-2021, 06:55 AM   #6
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Doing lots of googling suggests that for a couple years CAT didnt place a fuel/water seperator on these engines, just 2 fuel filters...
My coach is the same vintage as yours and has the water separator bowl. It's just an amber colored cap that attaches to the bottom of the filter. I've got an invoice around here somewhere where I purchased a spare from Gaffney. I'll dig it out after while.
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Old 05-25-2021, 09:23 AM   #7
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The part numbers from my visit to Gaffney:

Primary Filter/Water Separator - ABP N122 32FRT01
Bowl(Racor) - RAI RK 30051
Secondary Filter - CAT 1R-0751

HTH
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Old 05-25-2021, 09:29 AM   #8
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Thank guys, I believe I already have the pump. Was looking for the serial number for the primary CAT fuel filter, or input on continuing to use the Fleetgaurd. The filter on there now is a 20 micron, labeled, sold primarily for agricultural equipment...

Doing lots of googling suggests that for a couple years CAT didnt place a fuel/water seperator on these engines, just 2 fuel filters...

When using the hand pump... any tricks? Or just put on 2 filters dry and pump?

Some confusion here. Your chassis maker, not Caterpillar decided on one or two filters and their location. All Caterpillar did (same answer for Cummins) it tell the chassis maker their filtration requirement (2 micron in this case).


Yes, best to have a primary fuel filter/water separator with course filter element (somewhere between 10 and 30 micron) and then a secondary filter (2 micron). Yes, with the Caterpillar manual primer pump on the secondary filter. Your chassis maker (sadly, in many cases the bean counters at your chassis maker) made these most of these decisions.


And, to clarify, the primary fuel filter IS the water separator. Best ones have a clear bowl with drain so you can tell if there is water or contaminants by just looking. Some have a sensor that alerts you to the presence of water in the primary filter.
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Old 05-25-2021, 09:47 AM   #9
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Some confusion here. Your chassis maker, not Caterpillar decided on one or two filters and their location. All Caterpillar did (same answer for Cummins) it tell the chassis maker their filtration requirement (2 micron in this case).


Yes, best to have a primary fuel filter/water separator with course filter element (somewhere between 10 and 30 micron) and then a secondary filter (2 micron). Yes, with the Caterpillar manual primer pump on the secondary filter. Your chassis maker (sadly, in many cases the bean counters at your chassis maker) made these most of these decisions.


And, to clarify, the primary fuel filter IS the water separator. Best ones have a clear bowl with drain so you can tell if there is water or contaminants by just looking. Some have a sensor that alerts you to the presence of water in the primary filter.
In my case, the primary filter is just a regular fuel filter. No bowl, no drain...

Does this filter still act as a water/fuel seperator (ie. Water settles in the bottom), or is there something special about an actual fuel/water seperator other than the see through bowl?

The freightliner service center placed these filters...
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Old 05-25-2021, 09:50 AM   #10
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As Brett mentioned , cost of relocating the secondary filter off the engine , was probably the deciding factor . Being between the manual pump , portion of the HEUI, and the cylinder head the filter is under 65 psi pressure , so special hoses are required .

Freightliner relocated the filters , along with the manual pump , below the battery tray on my coach . The location isn't great as the , plastic section of the water separator/filter was low behind the RS duals . So I use all metal filters with a water drain.

I do install filters dry , and use the primer pump to fill them .
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Old 05-25-2021, 09:51 AM   #11
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In my case, the primary filter is just a regular fuel filter. No bowl, no drain...

Does this filter still act as a water/fuel seperator (ie. Water settles in the bottom), or is there something special about an actual fuel/water seperator other than the see through bowl?

The freightliner service center placed these filters...

Quite likely that primary filter head will accommodate a better choice in filter elements.


But, yes, water is heavier than diesel, so it will settle to the bottom. But, with a solid filter, no drain and not water sensor, you are left in the dark in terms of water and/or contaminants in the fuel.


Again, my recommendation is a 10-30 micron filter element with a clear bowl.



Hopefully, a call to Freightliner with your VIN will get you more information on "upgraded" filter options that will fit on your filter head.


Here is a picture of the KIND of filter/clear bowl I am referring to (no, not suggesting this one will fit your application, but will give you an idea of what it will look like): https://www.amazon.com/Racor-514988-.../dp/B000N9FYBI
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Old 05-25-2021, 08:29 PM   #12
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I have a local CAT dealer in town. I call them and only use Cat filters fuel and Oil and and Cat oil. I find its less costly than my local NAPA so you know your getting the right product at the right price. I am not associated with Cat just a happy customer.
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Old 05-26-2021, 08:09 AM   #13
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I have a local CAT dealer in town. I call them and only use Cat filters fuel and Oil and and Cat oil. I find its less costly than my local NAPA so you know your getting the right product at the right price. I am not associated with Cat just a happy customer.
I bought some filters this week off the CAT website... was CHEAPER than amazon!
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