Fuel filter keep cogged up after I replaced 3k miles.

bio-diesel will kill filters if you have pumped any into your tanks.i know of a couple outfits that quit running it even though they were getting some kind of break for doing so. just an alternative suggestion-

 

This may not be your problem yet I thought I would mention it.

Once one winter running across Texas all of a sudden my Cummings engine started running bad. Thankfully I was close to a truck stop, when I pulled in and stopped my engine sounding as if it was getting air.

I bought a fuel filter & a quart of auto transmission fluid along with two bottles water treatment for diesel fuel. I poured one bottle of treatment in each tank, the killed my engine changing the fuel filter. I believe at that time my fuel was trying to gel up.

From them on anytime it would get down close to 32 degrees I would always keep fuel treatment in my tanks. Never had that problem again.

 

Yeah, there are a lot of factors going on that the OP didn't provide info. What location did he buy the fuel before getting into 15F weather? What is the micron size of the filter? Did the fuel have some bio in it? That one is a big "probably" as many fuel stops are blending some bio in the fuel nowadays. The plugging could be from dirt, bio, or water that is crystallizing.

As per your update, I would bet bio is the issue. No positive way to tell from my keyboard, but that would be my first choice. One thing for certain, based on the fuel out here and that I only run the upper tier of the U.S., I always throw a little additive in my fuel whenever I fill up. Just me. I get additive from my oil supplier in volume so that it only dings me for about 2-3 cents a gallon to spike the fuel when I fill up. I am not going to rely on fuel stops to get it right.

Oh, and something to consider if you are running a very low micron rating filter. Move up a few micron levels in the winter. Even though Detroit, for instance, says 7 micron filter, if you dig into their Lubrication, Fuel, and Filters manual, they say 7 to 15 micron. I would opt for the 15 in cold weather. That is just an example. Every OEM will be different.

 

How long should a filter last?

 

when I used bio fuel in the past, ESPECIALLY in cold weather I would get 200 miles out of my davco filter. many times. took 2 years off/on bio/non bio. now the bio is fine filter commonly goes 15,20,000 miles before needing a change.

 

^^^Similar to my experience. My present truck has only gotten some level of bio since it was put on the road 2.5 years ago, so it never had any issues. My previous one, it spent part of its life without bio and the last part getting fed bio. Went thru a few more filters during the switch, but it settled down and everything was normal for the last 3 years I owned it.