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Old 03-05-2013, 11:16 AM   #1
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Fuel filtering RVs versus boats

On our boats we use two filters before the on engine filter. Usually a 25 micron, down to a 10 micron than on to the engine 2 micron. What do they do on the diesel RVs? Cummins in particular.
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Old 03-05-2013, 12:16 PM   #2
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Engine filter only. Although I run Amsoil and have two additional filters for that. I change engine filter annually and Amsoil oil filters approx 85,000 miles.
I have oil tested annually. I have not changed my oil for over 80,000 miles. And still getting good reports from oil analysis.
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Old 03-05-2013, 02:11 PM   #3
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Quote:
Originally Posted by fighterpilot View Post
On our boats we use two filters before the on engine filter. Usually a 25 micron, down to a 10 micron than on to the engine 2 micron. What do they do on the diesel RVs? Cummins in particular.
They use a single 10 micron Fuel filter, water separator.

The boats may use separate water separator then fuel filter like many of the big trucks.
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Old 03-05-2013, 03:59 PM   #4
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Diesel Motorhomes,if they are built right,use one primary fuelfilter/waterseparator of 30 micron or 10 micron and then a secondary fuel
filter of 2 micron at the engine or remote.
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Old 03-05-2013, 05:59 PM   #5
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Quote:
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Engine filter only. Although I run Amsoil and have two additional filters for that. I change engine filter annually and Amsoil oil filters approx 85,000 miles.
I have oil tested annually. I have not changed my oil for over 80,000 miles. And still getting good reports from oil analysis.
WOW....80,000 Miles??? I use Dello.....19 quarts once a year. My yearly change is April/May. It is stored indoor dry storage/cement floor during the winter. Last year we only put 2000 miles on it. Any idea where I would get an oil analysis? I know of no oil brand that recommends that many miles or going past one year on their oil products.
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Old 03-05-2013, 06:24 PM   #6
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You can get an oil test kit at a Cat repair facility. The kit will.cost you about $20
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Old 03-05-2013, 06:25 PM   #7
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Quote:
Originally Posted by csrrsr

WOW....80,000 Miles??? I use Dello.....19 quarts once a year. My yearly change is April/May. It is stored indoor dry storage/cement floor during the winter. Last year we only put 2000 miles on it. Any idea where I would get an oil analysis? I know of no oil brand that recommends that many miles or going past one year on their oil products.
Here is a oil testing service:

http://www.jglubricantservices.com/
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Old 03-05-2013, 06:44 PM   #8
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I believe the OP is talking about Fuel Filters and not oil filters given the title of his post.
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Old 03-05-2013, 06:50 PM   #9
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Quote:
Originally Posted by Mike Canter View Post
I believe the OP is talking about Fuel Filters and not oil filters given the title of his post.
He (csrrsr) asked where he could get an oil analyst so I thought he wanted a oil sample test kit
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Old 03-05-2013, 06:50 PM   #10
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My bad, it is meant to be fuel filtering. Thanks
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Old 03-05-2013, 07:16 PM   #11
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My 2000 Cummins ISB has a single filter, 20-25 micron depending on who you ask. Newer Cummins engines with the High Pressure Common Rail fuel system need cleaner fuel and use two filters, the 2nd is 2-3 microns.
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Old 03-05-2013, 07:32 PM   #12
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My previous 1994 mh with a Cummins 5.9 with mechanical injection had two fuel filters. A 30 micron with a water separator then a 10 micron on the motor. The one on the motor comes from CAT or Cummins or whoever makes the diesel. The water separator/primary fuel filter is installed by who makes the mh. So therefore the type of primary or if there was a primary does not have a thing to do with the diesel manufacture but the whim of the mh manufacture
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Old 03-05-2013, 08:04 PM   #13
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I plan on installing a Racor in addition to the factory filter, just haven't gotten to it yet.
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Old 03-05-2013, 08:15 PM   #14
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If anyone is considering adding or changing out the primary filter/water separator then you should consider the RACOR 700 Series. I replaced my old Racor unit with it. The 700 Series has a built in priming pump that will fill the whole fuel system if changing the filters or if you ran out of fuel. Comes with a little control panel with a push button switch for the priming pump. It also has a water in fuel sensor that hooks directly into the Monaco cable so the dash warning light works. The cost around $260 but is well worth it.
Attached Files
File Type: pdf Racor Fuel Filter and Water Separator Unit.pdf (535.8 KB, 24 views)
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