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Old 05-06-2021, 07:02 PM   #1
Junior Member
Monaco Owners Club
Join Date: Jun 2018
Location: Arizona
Posts: 27
Fuel filters for ISB 300 04 Monaco Cayman

I am looking to replace both my primary and secondary/water separator filters with the correct ones but seem to be getting confusing info from the coaches manuals.

Cummins says only one filter installed on their engine per S/N. there should be only 1 filter Fleetguard FS 19896 water separator and its a 7 micron filter

Monaco owners manual says:

Secondary is as above a Fleetguard FS19869

Primary is Fleetguard 53201P but Cummins says no such animal.

Monaco manual states that both the Primary and the secondary/water separator filters are 10 microns

So the question is What should the primary spin on filter be for my 04 Monaco Cayman w Cummins ISB 300 R4r Roadmaster chassis

What's on there now is NAPA :
Primary 3405 which is a 10 micron

secondary/water separator 3604 and 8 micron but per monaco should also be a 10 micron.

what should they be?
2004 Monaco Cayman 34PDD
300 HP Cummind , Allison 5 speed
pulling 2015 Jeep Cherokee Trailhawk
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Old 05-07-2021, 08:24 AM   #2
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Holiday Rambler Owners Club
Join Date: Apr 2020
Location: Farmington Hills, Michigan
Posts: 236
That's basically how my HR is set up, the engine mounted filter removed by coach builder and installed both primary and secondary filters in the back of the coach for easier replacement.
On mine, the primary is I think 20um with a sediment bowl and the secondary is 10um and has a water sensor.
Don't know why but previous owner on mine had put a different brand and part # 10um primary filter without a sediment bowl, maybe cost or availability. My owners manual does not specify the micron rating for the filters, just the Fleetguard part #'s and Fleetguard does not think this is important enough to put in the Spec table and really need to search for that info.

Someone more knowledgeable on your coach needs to confirm the secondary filter part number but the 2004 Cayman owners manual I found on line says the secondary is FS19596.
2004 Holiday Rambler Imperial 40PKD, Cummins ISL 400
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Old 05-08-2021, 09:45 PM   #3
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Join Date: Jan 2020
Posts: 67
Greetings Pschweizer,
As Lowflyer says, pretty much ignore what Cummins says ... not because they're wrong but because coachbuilders often add things that would not be feasible for the engine makers to "hang off" their stand-alone products. Those additions are usually aimed at enhancing longevity or ease of maintenance and if you're lucky ... both (dual filters in a side radiator good example -- don't even have to bend over to change). So kudos to the coachbuilders when you see those kinds of additions.
My 05 Camelot (ISL) has two filters, the primary has the water-in-fuel sensor and a drain. The secondary has neither. Primary is a 10 micron, secondary is a 5 micron. This setup makes sense to me -- water drain and sensor in primary of larger micron rating (eliminate water and get out the big chunks so to speak), and follow up with a very fine micron secondary before heading to the injectors. And these filters are specified in the owners manual in the "Filters and Belts" table/chart.
2005 Monaco Camelot
2013 RAM 1500 toad
...and a duck in a diaper
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fuel, monaco

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