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Old 11-03-2015, 11:30 AM   #1
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Fuel Filter Change - 1999 Diplomat ISB 275

Hi, all:

I've had my Monaco Diplomat for about 3 months now, and I believe it is time to change the fuel filter(s). I have driven quite a bit in these past few months.

I've noticed that many RVers can and do their own filter replacements...and I'd like to as well. I cannot find the instructions, however, in any of my literature. Similarly, my internet searches did not find anything

Does anyone have a scan of an instruction manual or the like that I can use? Or maybe a link to a video tutorial, or anything that might help me find step by step instructions?

Again, this is a Cummins ISB 275 24 valve Turbo Diesel. I appreciate any and all replies! Thank you!
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Old 11-03-2015, 02:07 PM   #2
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Changing the filters is straight forward. The problem is bleeding the system afterward.
If you can fill the filter up before installing. My 98 Dynasty has a racor filter which can't be filled before installing but has a electric pump so it's simple to bleed and my other filter I fill first so bleeding is simple. After I bleed the racor filter as I start the engine
I push the electric fuel pump switch till it starts. Mine bleeds easily. Bleeding on some engines can be complicated.
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Old 11-03-2015, 02:33 PM   #3
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Quote:
Originally Posted by oldguy70 View Post
Changing the filters is straight forward. The problem is bleeding the system afterward.
If you can fill the filter up before installing. My 98 Dynasty has a racor filter which can't be filled before installing but has a electric pump so it's simple to bleed and my other filter I fill first so bleeding is simple. After I bleed the racor filter as I start the engine
I push the electric fuel pump switch till it starts. Mine bleeds easily. Bleeding on some engines can be complicated.

Why can't you fill the racor? Cummins in Ocala master tech (Arnold) told me to fill one and cycle the lift pump 3 times to fill the other. Have to find my notes on which one to fill. Is the racor the one with the water sensor plastic bowl? Is that one the primary or secondary?
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Old 11-03-2015, 04:50 PM   #4
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I had a 99 Dip. and changed the filters a few times. I found prefilling them worked best for me. I had a short threaded pipe I would screw into the center, that way no unfiltered diesel would get in system when prefilling. You want to prefill the outside holes, the center is filtered and goes the the engine. Be sure to only do one filter at a time and start engine before doing the next filter.
I tried the "cycle the pump thing, and didn't like the misfireing and shaking of the engine when it cranked up, just seemed too harsh.
Take your time, make sure everything is clean.
Hope this helps some.
John G
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Old 11-03-2015, 05:37 PM   #5
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Rancor fuel filter in the compartment on driver side just in front of dual wheels on the back wall with a clear or plastic bottom, it is a Racor S3102P or Donaldson P555010 and it the primary filter, after changing start the engine and let it run for 3 to 4 min, the secondary fuel filter is on the passenger side of the engine it can be accessed from inside under the bed. There are two different filters used on the 99 Dip one is a canister type the other is a sock or cartage type pt #fleetguard FS19855 or Donaldson P550785 , to prime install filter loosen bleed screw on top of filter and rotate the key on then off for 15 seconds and back on until fuel comes out the bleed screw. I don't have the part no on the canister type.
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Old 11-03-2015, 06:14 PM   #6
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ereadingRV
Do you have the engine manual for your coach. There is a section in it that details how to change the fuel filters.

I have a 8.3 ISC 350 HP. In the manual it specifically says not to prefill the filter.

Pull the old filter off, on both mine I can drain the fuel out of them before unscrewing. Make sure you get the old O-rings off the filter base. Make sure the new filters have the O-rings installed, put a small coating of oil on the surface of the O-rings or gaskets. Tighten the filters as instructions show. I change 1 filter at a time, turn on the key 4-5 times for 30 seconds, this cycles the lift pump to fill the filters. Then start the engine. If it doesn't start, cycle the key several more times. Then change the 2nd filter.

I've never had a problem changing the filters and carry 2 sets of spares while we travel, never had to put one on during our travels.

FYI when I store the coach for extended periods I add a dose of both Biobor and Startron to keep any algae out of the system.
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Old 11-04-2015, 06:26 AM   #7
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Jim using the nipple like John describes is completely safe and a easy way to make sure you don't get air locked. The 99 dip fuel filter location are complete different than yours and the fuel pump won't refill his primary filter but will the secondary.
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