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I changed the fuel filters on our 14 Jeep Grand Cherokee Eco Diesel today and noticed one of the filters was much lighter than the other as shown in the picture. The dealer changed last time and it looked very easy so I decide to do myself this time. I looked further and saw the rubber piece that goes inside the hole was in the filter so a couple of questions:

What would cause this to happen?

Is this why the filter is so light as basically it wasn't filtering fuel?

Has anyone seen this before when changing their Jeep diesel fuel filters?

When I changed the filters I put a little bit of oil on the threads/rubber gasket but I don't put anything on the hole of the filter as it is my understanding that is where the fresh fuel goes back into the fuel system and I don't want to take a chance on some contaminant getting in the fuel system because I had something on my finger, etc. To be honest I am not sure if dirty fuel goes from the outside of the filter to the center or from the center to the outside. I would assume it is outside to center and then into fuel system.

Any feedback is appreciated.

Thanks,

Mark
 

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I did this last fall in my 14 but both filters looked exactly the same when I removed them. I used some engine oil around the rubber ring and I also just rubbed some diesel into the hole in top of the filter with my finger (I was wearing rubber gloves and just used the diesel that came out when I opened the drain valve). I haven’t had any problems with it - as you say, this was a pretty easy job, and I’m certainly no mechanic.
 

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From the Diesel Supplemental owner's manual:
Fuel filter replacement intervals should be every second oil change and
must not exceed 20,000 miles (32 000 km) if using diesel fuel up to B5.
 
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