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Old 01-06-2013, 11:03 AM   #1 (permalink)
testdrive
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TP-3012 fuel filter and expected life

This should be of interest to all of the DIC watchers as to percentage of filter life. I am interested in comments from the "oil is oil" members and anyone else.
This is not about be cheap or reckless about service.

Many knowledgeable members agree that fuel filter percentage is related to the measured vacuum needed to pull fuel from the fuel tank. Does it also have a mileage component and if it has that mileage component has that doubled (~15K to ~50K miles)? Some members report seeing near 50K on the new LML models. And as always, your mileage will vary as to conditions.

Ramblinrodney in another thread stated that he believes in the accuracy of the LML fuel filter percentage... And I also share his belief. Do you?

With this in mind the earlier models use a early design filter along with a higher sulfur content fuel. In 2009 GM introduced the TP-3012, a third generation filter and much improved and longer life filter, smaller micron filtering, and with a coalescer making it much safer when dealing with small amount of water. GM's introductory description is pasted below. It is worth a read...

The question I was wanting answered, is it OK just to reset the filter percentage indicator and run it another 15K on the earlier generation of the Duramax when using the TP-3012. Of course, I would watch it for the normal drop per distance traveled. I also monitor fuel rail pressure.
I have a feeling that the LBZ and older used not only the measured vacuum, but also a mileage factor for the DIC readings. The percentage on my LBZ drops in a linear curve as if it is locked to mileage. If it were using the vacuum needed method, it should drop much faster toward the end of life. More plugged the filter gets, faster per mile driven it should drop.
Remember, the LML and newer uses the same fuel, within reason, and the same filter. I have no way of verifying my assumptions. The difference now is that sulfur was deleted and the filter was improved.

And I am not wanting to start a discussion as to when to change a filter because of personal preference.

This is not about be cheap or reckless about service.

The source of the following is
New 6.6L Duramax Diesel Fuel Filter
A new fuel filter (12633243/TP3012) is now available
for all 2001-2009 Chevrolet and GMC C/K models and
2003-2009 Chevrolet and GMC C4500/5500 series vehicles
with the 6.6L Duramax Diesel. It has been designed
to offer better protection in engines that may use an
unreliable fuel source with potential water conditions.
Compared to the existing dual pleat design filter,
the new coalescer filter provides the following
improvements:
– Significantly improved water separation with both
diesel and biodiesel blended fuels to protect fuel
injectors and pumps from corrosion.
– 1.5 to 2 times the contaminant capacity, depending on the type
of contaminants in the fuel. (Longer life/less prone to plugging
problems and better performance at high altitudes.)
– Improved resistance to cold weather plugging with diesel and
biodiesel improperly blended or additized for cold operation.
Please note that the new fuel filter (12633243/TP3012) will be
shipped in boxes labeled with a different part number (98081884/TP3012)
until the current inventory of boxes is exhausted.
For more information, refer to ACDelco Bulletin
#09D-068.
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Last edited by testdrive; 01-06-2013 at 11:10 AM.
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Old 01-06-2013, 11:36 AM   #2 (permalink)
dnewton3
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I know the OLM is a "smart" monitor by tracking many inputs.

But I thought the Fuel Filter lifecycle was simply predicated on miles only.

And I have some experience to judge this by ...

I had replaced my fuel filter BEFORE my long vacation trip, and forgot to reset the fuel filter minder (which in my W/T, requires the tap-dance on the pedals ....). While on vacation, perhaps 1k miles later, the fuel filter minder came on. So - I reset it. And it's been "off" since that time, and more than 4k miles ago.

If the fuel filter minder is predicated on a vacuum differential, then why is it that it was only tripped about 1k miles AFTER I put a new filter on? I doubt that it's pressure differential that triggers the system. Perhaps my expereince was a fluke. If someone has proof otherwise, I'd like to see it please.


I don't have the DIC controls, so I have not ability to track lifecycle until the message pops us, but many of you do. Can you see a truly linear response between mileage and % life of the fuel filter? If it's reasonably linear, then the system must be distance only. As noted above, if it were on vacuum, then there would be fluctuation with restriction, and could not explain my personal experience.
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Old 01-06-2013, 12:00 PM   #3 (permalink)
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On my LBZ...it is definitely a linear calculation as I have experienced the same situation as dnewton..that is a new filter installed, forget to reset the filter life, and then a change filter message shortly thereafter. I am unsure if it is based on mileage...or calculated fuel burn.

On my LMM.....I'm not sure yet what the calc is based on. It appears to be different....but I am dealing with a different engine and vehicle combo (truck vs. cutaway) so it's too soon to tell. I have watched the % numbers on the DIC and they don't appear to be linear...but I cant say for sure.

A fuel system vacuum gauge is on my want list...then I can tell for sure.

Both vehicles are however doing fine with 40 to 50k change intervals. I cut all my filters open at each service and have yet to see any signs of distress....and I have never had an injector issue on any diesel I've owned.
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Old 01-06-2013, 02:52 PM   #4 (permalink)
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dnewton3, Piperone,
Thank you for your replies.
It is evident that GM has changed the algorithm in the new trucks. I think it may be a little smarter system than the LBZ and earlier. And it may not be as linear as the LBZ. After all GM has researched oil life and now filter lifecycles over many years and I think they have done a good job so I would expect refinement in the new generations.

Maybe this is a good point to ask if any one has actually found a vacuum sensitive sensor that could be used for differential pressure on the fuel system?
But... Some have reported that the fuel lifecycle is depleted rapidly by a quickly plugged filter.
I sure am not the knowledgeable Duramax guy, but this is something I want to learn about.

Yes, from my experience miles continues to have the biggest impact on the filter lifecycle. It may work off of the amount of fuel as Piperone suggests. This makes a lot of sense. I am beginning to agree with the amount of fuel used.

One important note in this thread... I am a believer in the AC TP3012/12633243 or the Donaldson filter as they are the manufacturer. This is one area that second best is not good enough.

Quote:
Originally Posted by dnewton3 View Post
I know the OLM is a "smart" monitor by tracking many inputs.
But I thought the Fuel Filter lifecycle was simply predicated on miles only.

And I have some experience to judge this by ...

I had replaced my fuel filter BEFORE my long vacation trip, and forgot to reset the fuel filter minder (which in my W/T, requires the tap-dance on the pedals ....). While on vacation, perhaps 1k miles later, the fuel filter minder came on. So - I reset it. And it's been "off" since that time, and more than 4k miles ago.

If the fuel filter minder is predicated on a vacuum differential, then why is it that it was only tripped about 1k miles AFTER I put a new filter on? I doubt that it's pressure differential that triggers the system. Perhaps my expereince was a fluke. If someone has proof otherwise, I'd like to see it please.

I don't have the DIC controls, so I have not ability to track lifecycle until the message pops us, but many of you do. Can you see a truly linear response between mileage and % life of the fuel filter? If it's reasonably linear, then the system must be distance only. As noted above, if it were on vacuum, then there would be fluctuation with restriction, and could not explain my personal experience.

Quote:
Piperone wrote
On my LBZ...it is definitely a linear calculation as I have experienced the same situation as dnewton..that is a new filter installed, forget to reset the filter life, and then a change filter message shortly thereafter. I am unsure if it is based on mileage...or calculated fuel burn.

On my LMM.....I'm not sure yet what the calc is based on. It appears to be different....but I am dealing with a different engine and vehicle combo (truck vs. cutaway) so it's too soon to tell. I have watched the % numbers on the DIC and they don't appear to be linear...but I cant say for sure.

A fuel system vacuum gauge is on my want list...then I can tell for sure.

Both vehicles are however doing fine with 40 to 50k change intervals. I cut all my filters open at each service and have yet to see any signs of distress....and I have never had an injector issue on any diesel I've owned.
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Old 01-07-2013, 09:24 AM   #5 (permalink)
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Fuel filter life. Post #16 Fuel Filter interval....
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Old 01-07-2013, 09:44 AM   #6 (permalink)
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I've got a 2um cat filter pre stock filter. I put the new stock filter on at 25k miles and still have it on at ~78k. I've replaced the cat filter once at ~60k. I've reset the fuel filter % probably 4-5 times over that period. It always seems to go down at the same rate and miles driven. I don't have any power issues but have not measured fuel pressures so it's not very scientific. I figure the cat filter is getting everything before it gets to the stock filter so I don't need to change it very often. In fact it should be 100% clean. Based on that experience I would say that the fuel filter life monitor might be smart but if the computer doesn't sense a drop in pressure it probably goes by a max miles driven meter like the oil life system does if you drive all highway.
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Old 01-07-2013, 10:20 AM   #7 (permalink)
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Quote:
Originally Posted by testdrive View Post
Maybe this is a good point to ask if any one has actually found a vacuum sensitive sensor that could be used for differential pressure on the fuel system?
But... Some have reported that the fuel lifecycle is depleted rapidly by a quickly plugged filter.
I sure am not the knowledgeable Duramax guy, but this is something I want to learn about.
When I was installing my Lift Pump, I pulled up a Diagram of the Fuel delivery system(LML), I am gonna see where That went to, But I remember reading up on the system, there is a Vacuum sensor After the fuel filter that plays into this, whether or not this switch triggers the Change filter message, or is sensing vacuum is what I need to re-read. I have so much crap stored on this PC it's not funny...
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Old 01-07-2013, 10:22 AM   #8 (permalink)
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The deletion of sulphur from the fuel has a side effect in that the fuel now more readily suspends water. Hence the redesigned element.

The LML fuel filter life monitor system is almost perfectly accurate, save for those who baby the throttle for months on end, then, all of a sudden, decide to pull a 12k lb trailer.

The short answer. Fuel filter life is dependant on fuel quality, period. I've seen 38k miles on a '05 with a TP1298, and, definitely, 50k miles plus on a TP3012 in an '07.5.

When the '05 needed a filter, it gave several warnings before it became an issue. Stumble at takeoff, stumble when aggressive, and 2k miles later, bam, no throttle response (naturally 75 miles from home, at night, in the rain, on a mountain).

So, to the OP, change your filter every 30k miles or, if you wish to be more accurate, install a vacuum gauge, and, monitor actual rail pressure vs desired.

LBZs, and reflashed LLYs, simply have a 15k mile clock on the filter. LMMs and LMLs measure vacuum and rail pressure.
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Old 01-07-2013, 10:55 AM   #9 (permalink)
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I am going by the new truck Duramax supplement maintenance requirement:

2 years or per the DIC, which ever occurs first. Right now I have 15,000 miles on the filter - the point that I would have changed it per the 2007.5 manual and the filter design at that time. Looks like I will make it to the 2 years mark, May 29, 2013.

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Old 01-07-2013, 11:10 AM   #10 (permalink)
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Thanks to all, all good answers.

FC5452... I want to know more about the placement of the vacuum sensor and if it is a analog sensor feeding the ECM or if it is a simple switch.

Mccall, I like your answers... Experienced, straight forward, and to the point. You saved me some un-necessary work in the future. I've got my filter schedule figured out.

My first 15K mile filter replacement went just fine, but when I did an autopsy on it and found it totally clean and not even any sedimate in the bottom , I began to wonder if it could go longer.
And as is always the case, your mileage will vary.
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