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Old 09-21-2015, 09:02 AM   #1
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2006 ISL400 Filters. Where?

Having fuel problems with my 2006 HR Endeavor.

I found the primary fuel filter (FF5488) and fuel/water separator (FS1022), both of which are on the driver-side behind the air-conditioner grill. My information says there should be another fuel filter (secondary, FF1003), but I can't find it.

Any help, please?

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Old 09-21-2015, 09:13 AM   #2
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I'm going to say you have found to two, never herd of a "third" fuel filter unless aftermarket, btw the water separator is also a filter.

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Old 09-21-2015, 11:27 AM   #3
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Pretty much what I figured, too. Except for one place I saw last nite that said there's 2 of them, and now I can't find that source either
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Old 09-21-2015, 11:30 AM   #4
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Doesn't your owners manual have a picture of the whole rig showing grease points and filter location. Mine does
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Old 09-21-2015, 12:55 PM   #5
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Yup, that's where I found the other two, but the 'missing' one bothered me.

Just got off the phone with both Cummins & Monaco, and they confirmed just the 2 of them (FS1022 & FF5488). I now believe there may have been a transposed letter in in my source-data, or he was just confused.... Cummins did verify that there was/is an alternate for the FS1022 - and it's a FS1003 - and NOT a FF1003 like the OP said, but the horse's mouth(s) disagreed.

So there ya have it.

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Old 09-21-2015, 01:06 PM   #6
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On my 2006 Diplomat, which I believe is the same as the HR Endeavor. The filter behind the AC grill is a combination unit (filter/water separator)and the second filter is located high up under the rear cap on the right side (looking from the rear). I can only see it laying on my back and looking up with a flashlight. Not the most convenient location but it might worth a look.
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Old 09-21-2015, 01:13 PM   #7
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Do you know the numbers, Lou?

(Whoops, pushed SEND insteada ENTER)... Both of mine are behind the AC grill. Nothing under the cap.

Someone once said these things (even twin sister Dip/Endeavors) are like snowflakes - no two are alike.

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