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Old 02-01-2014, 08:46 PM   #1
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Change the Fuel Filter on an ISL 400

I have A 2005 allegro bus with a 400 ISL engine. I want to replace the two fuel filters on it. On my tractors and my diesel pickup you prefill the filter open the bleeder screw and use a manual pump to get the air out. From what I have read you do not prefill the filters. You turn the key off and on several times and the electric fuel pump fills the filters. I do not see anything about bleeding the lines and I do not see a bleed valve on the pump. Could someone give me some information on this
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Old 02-01-2014, 09:41 PM   #2
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Turing the key on for 30 seconds about 1/2 a dozen times works prefect.
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Old 02-02-2014, 08:17 AM   #3
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There's also a constant push pull about pre-filling filters. Some do and some don't. Recommendations on "dont" seem to all come to the issue of you introducing contaminants in the pre-fill , either through dirty fuel or sloppy procedures. As an old farmer, I pre-fill mine using the outer filter holes and have never had a problem. Also, I've had to run the on-off trick a dozen times or more when I don't prefill before the engine would kick and hold. I'm sure others will be glad to share their procedures and why.
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Old 02-05-2014, 04:42 PM   #4
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Another farmer here and I also ALWAYS pre-fill my filters, fuel & oil whenever possible. I also work in the off farm season at a Wester Star/ Freightliner dealership and the older mechanics pre-fill while the younger techs do not. Instead they crank the engines over for long periods of time which drives us "old timers " they don't take the time to let the fuel pump fill the filters.
I believe as long as you use common sense you will not introduce any contaminants into the filter by pre-filling.
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Old 02-05-2014, 05:47 PM   #5
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I used to fill mine with automatic trans . Fluid.
Worked fine on the middle 90's dodge with the cummins.
Trick I learned from a cummins tech. Had the cummins house change the first one.
Did the rest myself. 160k. When I retired it. Changed twice a year.
Did the same with the John Deere's. Twice a year.
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Old 02-05-2014, 06:00 PM   #6
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Quote:
Originally Posted by gemini5362 View Post
I have A 2005 allegro bus with a 400 ISL engine. I want to replace the two fuel filters on it. On my tractors and my diesel pickup you prefill the filter open the bleeder screw and use a manual pump to get the air out. From what I have read you do not prefill the filters. You turn the key off and on several times and the electric fuel pump fills the filters. I do not see anything about bleeding the lines and I do not see a bleed valve on the pump. Could someone give me some information on this
This is for a CAT but food for thought with lots of references.
Changed fuel filter, now not starting!!!
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Old 02-07-2014, 09:03 PM   #7
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I had a Diesel Bounder with a CAT C7 and pre-filled that one too, but occasionally I'd have to re-prime it. I found that CAT offered a priming pump that screwed to the top of the filter mount. After that, never had another problem, but Cummins didn't choose to go that route, so I pre-fill on the ISL.
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Old 02-08-2014, 07:27 PM   #8
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Thank you for your help. I have ordered the new filters and I was amazed that the two of them combined was only ten dollars more than the fuel filter for my duramax pickup.

I had trouble getting my MH back home last week when I was on my way back from Oklahoma. On the interstate it seemed a bit sluggish when I got off the interstate I was going up one hill and it started cutting out on me. I gave it more throttle and I got a check engine light. The light was only on for two seconds then went off. All my gauges showed everything normal. When I got to the last big hill before my house I had trouble getting up that hill. I hope that the fuel filters will fix it. They were supposed to have been changed when I bought it last year but that does not mean that they were. I am going to put the new ones on then hopefully that will improve the running so that I can get it to the freightliner dealers to be checked out.
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