2015, first fuel filter change - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 13 (permalink) Old 03-07-2017, 09:10 AM Thread Starter
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2015, first fuel filter change

Just got done the first fuel filter change on my 2015 Denali. Fuel filter life remaining 61%, total milage 16,289, 503hrs, 23 months on the truck. While I was at it I added the Mad Jack fuel filter access panel, this is going to make these filter changes much easier going fwd.

Pictures of the two year old filter and access panel.
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post #2 of 13 (permalink) Old 03-07-2017, 09:37 AM
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Nice. Did you remove the fender liner to install the access panel or install in place?


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post #3 of 13 (permalink) Old 03-07-2017, 09:44 AM Thread Starter
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Originally Posted by Black HD View Post
Nice. Did you remove the fender liner to install the access panel or install in place?
I removed it. It was a bear to get back in as I have the GMC and the black trim that goes around the wheel openings, takes a bit to slide it into that tight gap.. LOL!

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post #4 of 13 (permalink) Old 03-07-2017, 09:47 AM
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Thanks. I may attempt mine w/o removing it when I'm ready to change the filter.


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post #5 of 13 (permalink) Old 03-10-2017, 05:56 AM
 
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I don't know much about diesel fuel filters, but just the discoloration is enough to consider changing mine (2015 with 3,9xx miles). The truck sits around a lot and rarely gets driven more than 30-40 minutes at a time.
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post #6 of 13 (permalink) Old 03-10-2017, 07:26 AM
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Originally Posted by Dyno Dan View Post
I don't know much about diesel fuel filters,...
Pics seen are normal for the primary media, but that's the 1st I've seen the secondary media showing some use. Unused voids will be present, as it's under vacuum pulling thru the filter. A used fuel filter's efficiency climbs with use (filters better), to a degree.

You have to wonder though, as there are many threads like this (late model LMLs) with higher filter mileage than most earlier models produced,....is there a correlation between the filter media usage and the CP4 pump (which has a growing history of failing a.k.a $grenade$)?

Does the new acDelco filter (TP3018 vs the older TP3012), in conjunction with the CP4, affect the DIC% parameters, where input has the filter life going far beyond earlier LMLs?

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post #7 of 13 (permalink) Old 03-11-2017, 07:54 AM
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Originally Posted by Hook'em_Horns! View Post
Pics seen are normal for the primary media, but that's the 1st I've seen the secondary media showing some use. Unused voids will be present, as it's under vacuum pulling thru the filter. A used fuel filter's efficiency climbs with use (filters better), to a degree.

You have to wonder though, as there are many threads like this (late model LMLs) with higher filter mileage than most earlier models produced,....is there a correlation between the filter media usage and the CP4 pump (which has a growing history of failing a.k.a $grenade$)?

Does the new acDelco filter (TP3018 vs the older TP3012), in conjunction with the CP4, affect the DIC% parameters, where input has the filter life going far beyond earlier LMLs?
I'm sure some of you have seen my comments on this. Exactly your first comment. Which is why I follow the filter percentage, but I also drain my filter from time to time, and I never let my tank go below 3/8. I have never gotten any water out of that thing...ever. However, my guess is that owners are forgetting to drain the water out of the bottom of the filter. Once enough water is held in the filer the media can't work to separate anymore and some sneaks by. I remember seeing a post that greater than 90% of all CP4 failures were water based. The other possibility is that after 2 years there is a chance that debris can build up on the back side of the filter and eventually break loose.

Even the Ford guys have had CP4 failures at a 22500 change interval. They have to change 2 filters, the water separator and the one near the fuel rail.

I have roughly 48k miles on the current filter (11% remaining) and I have a really clean source. I am going to change it really soon. I noticed that if I drive the truck cold it will fall flat on its face and my mileage has gone down slightly.
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post #8 of 13 (permalink) Old 03-12-2017, 06:59 PM
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post #9 of 13 (permalink) Old 12-03-2017, 03:41 PM
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Originally Posted by SuperBlackTruck View Post
I'm sure some of you have seen my comments on this. Exactly your first comment. Which is why I follow the filter percentage, but I also drain my filter from time to time, and I never let my tank go below 3/8. I have never gotten any water out of that thing...ever. However, my guess is that owners are forgetting to drain the water out of the bottom of the filter. Once enough water is held in the filer the media can't work to separate anymore and some sneaks by. I remember seeing a post that greater than 90% of all CP4 failures were water based. The other possibility is that after 2 years there is a chance that debris can build up on the back side of the filter and eventually break loose.

Even the Ford guys have had CP4 failures at a 22500 change interval. They have to change 2 filters, the water separator and the one near the fuel rail.

I have roughly 48k miles on the current filter (11% remaining) and I have a really clean source. I am going to change it really soon. I noticed that if I drive the truck cold it will fall flat on its face and my mileage has gone down slightly.
I've always wondered if adding the AD 2 165-4G affects the DIC's FFL percentage. The manual I read says not to let the fuel filter get over 2 years or 20,000 miles so it is confusing as to what to follow. I am chancing my fuel filter for the first time here at 17,000 miles next weekend along with my airdog fuel filter and water seperator.

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post #10 of 13 (permalink) Old 12-06-2017, 10:47 AM
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It typically doesn't effect the dic. In order to keep things working at their peak I do the lp fws and filter at an alternated intveral with the OEM. I don't even check the ws on the tertiary but I drain the lp fws every few months for peace of mind. I change the OEM on a 25k ish rotation as the other filters keep it very clean

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