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Old 09-13-2021, 08:02 PM   #1
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Fuel Filters

Hello,
I seem to be one of a few...
I own a 05 Avalanche. I purchased from the second owner who has owned the coach 15 years. From what I have read, it has gone through all of the recalls and had everything fixed that was a major issue on these from new.
Ive got the 400ISL and have problems with it "bucking" under acceleration. I have changed one fuel filter, but Cummins seems to think it should have 2. Does anyone know where the second filter would be? The one I know of is along the frame rail right above the starter.
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Old 09-14-2021, 08:37 PM   #2
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I don’t k ow for sure as I don’t have this model coach. However, generally they do have two filters (one is a water separator) and they are usually right next to each other. Fuel/water separator would be closest to the tank (first in line), and have a drain on the bottom of it. They’ll be close to the same physical size as well.

You may also have an algae issue. Black sludge in the tank. Did you happen to dump out the jelly from the filter you changed? How did it look? How old is your fuel and have you been through a bit of it recently?

I looked at the brochure and it shows a service area that’s supposed to house the filters and it appears to be along the frame rail, so you’re looking in the right spot.
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Old 09-14-2021, 09:12 PM   #3
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On the Alpine Coaches the other water separator fuel filter is located at the rear curb side compartment door where you check engine oil, trans, & air cleaner. I would think that should be the same on an Avalanche model, hopefully.
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