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Old 06-27-2022, 12:15 PM   #1
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2022 35CP Allegro Bus Fuel Filter

Does anyone else have this kind of corrosion on their remote Fuel Filter. Should we be concerned? We have only had the coach a month and put this on our punch list for the dealer to check. Iíve changed the fuel filters on our Phaeton a few times and never saw anything like this. The freightliner chassis had a different primary which I feel had a better fuel / water separator.
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Old 06-27-2022, 12:28 PM   #2
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I would not be concerned.
I left a set of brand new wrenches out overnight on a picnic table.
Came out the next morning and due to the dew, they were all rusted.
Leason learned!

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Old 06-27-2022, 02:05 PM   #3
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The bracket and threads on the fuel line in your first picture also look like they're rusting. I'd look around for more rust on the engine then above for a leak or something funneling rain to those areas
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Old 06-27-2022, 05:07 PM   #4
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Water can get in and collect on top of the filter, causing rust. It's of no real concern and eventually new filters will look better (but work the same way!).
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Old 06-28-2022, 10:12 PM   #5
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The top of the filter , from the seal to the outer rim , is bare steel and will rust .

In some states faster that others .
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Old 06-29-2022, 05:31 AM   #6
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Ours, on a 2014 Tiffin Allegro Bus 37AP, does this every time. I guess you could spray it with silicone, but you should change it every year, so it won't rust enough to matter.

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Old 06-29-2022, 10:22 AM   #7
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Quote:
Originally Posted by clafro View Post
Does anyone else have this kind of corrosion on their remote Fuel Filter. Should we be concerned? We have only had the coach a month and put this on our punch list for the dealer to check. Iíve changed the fuel filters on our Phaeton a few times and never saw anything like this. The freightliner chassis had a different primary which I feel had a better fuel / water separator.

I would bet there is a water separator/filter somewhere in the engine compartment. As far as I know Cummins requires 2 fuel filters, water separator filter is also coarse fuel filter, and a final filter which should be 2 micron final filter.
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Old 06-29-2022, 07:11 PM   #8
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That is the fuel/water separator - FS1003. The fuel filter had a plastic housing - FF63054NN.

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Old 06-30-2022, 03:50 AM   #9
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That is indeed odd, my water separator has a plastic bowl on the bottom of the primary fuel filter. That bowl has a knob to open and drain water away.
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Old 06-30-2022, 08:15 AM   #10
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The parts I listed are for a 2014-present (I think) Cummins ISL 450 hp. That is what the OP has.

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Old 06-30-2022, 08:38 AM   #11
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Quote:
Originally Posted by clafro View Post
Does anyone else have this kind of corrosion on their remote Fuel Filter. Should we be concerned? We have only had the coach a month and put this on our punch list for the dealer to check. Iíve changed the fuel filters on our Phaeton a few times and never saw anything like this. The freightliner chassis had a different primary which I feel had a better fuel / water separator.
Yesterday I checked a few new Allegro Buses at Lazydays and they all had this corrosion going on. I'm now thinking the problem might be Galvanic Corrosion.

Galvanic corrosion (also called ' dissimilar metal corrosion' or wrongly 'electrolysis') refers to corrosion damage induced when two dissimilar materials are coupled in a corrosive electrolyte.
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Old 06-30-2022, 03:49 PM   #12
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Yesterday I checked a few new Allegro Buses at Lazydays and they all had this corrosion going on. I'm now thinking the problem might be Galvanic Corrosion.

Galvanic corrosion (also called ' dissimilar metal corrosion' or wrongly 'electrolysis') refers to corrosion damage induced when two dissimilar materials are coupled in a corrosive electrolyte.

The aluminum usually corrodes faster in that, and it's limited to contact area.
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Old 06-30-2022, 05:12 PM   #13
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Quote:
Originally Posted by clafro View Post
Yesterday I checked a few new Allegro Buses at Lazydays and they all had this corrosion going on. I'm now thinking the problem might be Galvanic Corrosion.

Galvanic corrosion (also called ' dissimilar metal corrosion' or wrongly 'electrolysis') refers to corrosion damage induced when two dissimilar materials are coupled in a corrosive electrolyte.
Hmmm. The filter has a rubber (probably neoprene) seal that prevents contact between the aluminum filter housing and the steel filter case. There's a steel threaded pipe inside the filter housing that has direct contact with the aluminum and the filter, but as it's bathed in fuel it does not corrode.

It would be academically interesting to know whether the connection via the threaded pipe is enough to induce surface corrosion on the unpainted part of the filter case, but honestly--this isn't a *problem*. The rust will go away when you replace the filter and come back not terribly long thereafter, but it will never hurt anything.
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