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Old 09-20-2018, 09:50 PM   #1
Ali
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Cummins ISC 330 Fuel Filters

Hello everyone,

Do I have the correct fuel filters on our engine? Looking at the picture below, I have a Fleetguard FS1212 fuel/water separator on the left and a Fleetguard FS1022 fuel filter separator on the right.

Do I really need two of these? FS1022 filter on the right seems to do filtering and separation where FS1212 only good for separation. Do these compliment each other or they are there for redundancy?

Thank you in advance.
Ali
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Old 09-21-2018, 05:12 AM   #2
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You need both of them. I don't have the Radcore Water Separator number handy, but the FS1022 (Fuel Filter)is the right number for the 2002 Year Cummins 330.
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Old 09-21-2018, 06:34 AM   #3
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One filter is in line before the lift pump and one is after the lift pump. I believe the separator filter is pre-lift pump.
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Old 09-21-2018, 10:36 AM   #4
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Good morning Ali; Since owning Monaco Windsor's since 2003, the fleetguard filters that I have on my ISC are Primary filter# FS1242B. Secondary filter# FS1022. These filters match what the owners manual calls for as well as when I had my engine serviced at Cummin's, this is what the shop installed. The primary filter is the one to your left when looking in the engine compartment. The FS1242B, or just 1242 has a clear bowel on the bottom with a drain. Allows you to see if there is water or other things in the fuel through the clear bowel. Hope this answers your question.
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Old 09-21-2018, 11:02 AM   #5
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The need for the second filter , has to do with the filtration capacity , of both filters .
The first filter in the system ( with the water separator ) will probably have a 20 micron filtration capacity . Consider this a filter for taking out the lump sized , particulates in the fuel.
The final filter , will have a filtration level of 3 micron , so it only has to deal with particulates , in the 3 to 20 range.
If the system only had the 3 micron filter , to deal with all the particulates , it could plug up very quickly , and require very frequent changing.
Remember the , fuel system on these engines , use excess fuel to lubricate and cool the high pressure injection pump , and even at WOT will return as much as 70% of the fuel; supplied to the engine ; back to the tank . By the time you use a tank of fuel all the fuel will have been through the filters about 7 times ; that's why these filters can plug up so quickly.
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