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Only changed fuel filter once, now at 110k miles am I screwed?

CampChick

New Member
Apr 8, 2026
3
2
Truck Year
2015
Hi, new here! Hoping you all can help a big dummy out. So, in 2015 I bought an off-road pop up camper and an eco diesel because I wanted to pull the camper all over the west, especially up mountains, and the mpg for doing that is excellent. I’ve had all service work and oil changes done at the local dealership, all the recalls done, but I’ve never owned a diesel anything before and don’t really understand them. I can do simple car repairs by watching YouTube but not much of a car person.

Over the course of owning this truck I eventually came across the idea that there’s something called a fuel filter that has to be changed. The dealer never mentioned it ever. The next time I took the truck in for an oil change I asked the service advisor about it and they looked at me like I had three heads. They truly did not know what I was asking about. So I thought, it must not be all that important.

I watched a YouTube video, bought a replacement filter and the tool, and did it myself at the 75k mile mark. In the process I broke the plastic drain thingy so I glued it back in with JB Weld. The whole process was super stressful because I really didn’t want to screw it up and have the truck not start afterward, plus having the diesel fuel splashing out near my head lying under there, very nervous about breaking something else while pulling the old filter down and off and getting the new one back on.

In the last couple months I’ve had the water pump replaced and the crankshaft position sensor done, nearly 6k total. The position sensor failed on a trip so it was repaired at a different, more rural dealership. When I picked it up I asked about this fuel filter business, like does this really need to be done. This service advisor looked at me like I was crazy for not having done it regularly and suggested maybe getting rid of the truck now. They said that my local dealership probably doesn’t see many diesels and maybe that’s why they didn’t know about the fuel filter. And even out there in the country where they see more diesels, they said their techs don’t like to work on them.

I’m at 110k miles. Was hoping to drive this truck another 100k at least. But have I ruined it by not doing the fuel filter maintenance? Should I sell it to someone who knows what the heck they’re doing??? I was thinking to take another crack at changing the fuel filter again and see how it dirty it looks but would that tell me anything significant?
 
Apr 15, 2024
47
17
Truck Year
2016
I cannot answer your question. However, I can say that I've put 40,000+ miles on my used truck and haven't changed the fuel filter yet. Haven't had any fuel or engine related issue at all. I don't know if/when the previous owner did it.
 

Tremper126

Moderator
Staff member
Feb 15, 2019
1,061
364
Truck Year
2014
As long as you buy from reputable, high volume stations I think you’re fine. I do mine every other oil change and have 190k on it. But, lubrication is key for your cp4 HPFP. A good additive and I’d say you’re fine. Dealers hate the eco because it’s complex and tighter to work on but mines been pretty flaw free. The emissions will kill it before that fuel filter does.
 

CampChick

New Member
Apr 8, 2026
3
2
Truck Year
2015
As long as you buy from reputable, high volume stations I think you’re fine. I do mine every other oil change and have 190k on it. But, lubrication is key for your cp4 HPFP. A good additive and I’d say you’re fine. Dealers hate the eco because it’s complex and tighter to work on but mines been pretty flaw free. The emissions will kill it before that fuel filter does.
Thanks for the reply and reassurance. I’m not sure which count as high vol reputable stations. I often go to BP or Quik Trip. Of course on road trips it’s often just whatever I can find.. I’ve never used an additive. Is there one you’d recommend and how often?

I wonder if the z46 fuel pump recall/replacement gave the system a sort of reset
 

CampChick

New Member
Apr 8, 2026
3
2
Truck Year
2015
I cannot answer your question. However, I can say that I've put 40,000+ miles on my used truck and haven't changed the fuel filter yet. Haven't had any fuel or engine related issue at all. I don't know if/when the previous owner did it.
Are you planning to change it?
That’s the thing - I haven’t noticed any issues so have been driving around blissfully unaware.
 
Apr 15, 2024
47
17
Truck Year
2016
Are you planning to change it?
That’s the thing - I haven’t noticed any issues so have been driving around blissfully unaware.
Yea, eventually I will change it. I'll have to do research as to how often to change a particular filter brand. I'm all about preventive maintenance, but changing the fuel filter every 7,000 miles (my oil change interval) is absurd overkill.
 

Tremper126

Moderator
Staff member
Feb 15, 2019
1,061
364
Truck Year
2014
Thanks for the reply and reassurance. I’m not sure which count as high vol reputable stations. I often go to BP or Quik Trip. Of course on road trips it’s often just whatever I can find.. I’ve never used an additive. Is there one you’d recommend and how often?

I wonder if the z46 fuel pump recall/replacement gave the system a sort of reset
There is no real “fix” for it that I’m aware of, just replacement if it fails. It’s been a while since I looked into those recalls. To me, it’s cheap security every 15/20k to replace a filter so I don’t mind. And most times it doesn’t “look” bad but I’ve never cut it apart to really see it. For fuel treatment, I run the hotshot edt but have heard good things about arch oil. The cp4 is sensitive to clean, lubricated fuel which is why a clean filter is recommended. I could be wrong but I’m pretty sure 20k intervals for the filter is recommended. It all comes down to your preference. If you went 50k and didn’t have an issue then you could continue that and it could be fine! Same with the additive, if you have never ran any, then don’t sweat it! But to me, our parts are expensive, our oil changes aren’t the cheapest, cp4 failure can rack up costs quickly when they fail, why not spend a few extra bucks to try to prevent that bill. Now, the rate of failure on them isn’t as high as I think it’s hyped up to be, but there was enough cause for concern that the recall was issued.
Again, don’t lose sleep over it, just do what you feel is right and let it ride!
 
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