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2018 L5P Duramax Fuel Filter (TP1015) #5251296 10/27/19 01:35 PM
Joined: Aug 2003
Posts: 2,699
wwillson Offline OP
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14,628 miles
527 engine hours
DIC fuel filter life was ran down to 0%.

These filters start out white, so you can see there is quite a bit of debris on the filter. The computer seems to pick about the perfect time to change these filters. I wonder if it's just mileage or if the DIC computer calculates the filter life remaining somehow?


20191027_174936039_iOS.jpg20191027_174856638_iOS.jpg20191027_174954755_iOS - Copy.jpg
Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: wwillson] #5251306 10/27/19 01:46 PM
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Posts: 6,143
JohnnyJohnson Online Content
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Wilson I've put very little mileage on my Duramax for nearly 18 months now The fuel and the oil filter are still show low 80% on the oil and high 80's for the fuel filter.

Last edited by JohnnyJohnson; 10/27/19 01:46 PM.

2004 Corolla 139630
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77060
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: wwillson] #5251414 10/27/19 03:58 PM
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Rat407 Offline
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I was under the impression it goes by how many gallons you use.


2002 Silverado 5.3 5w-20 AMSOIL
Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: wwillson] #5251613 10/27/19 07:23 PM
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stockrex Offline
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Gallons, I did mine first time after 8 years and it still had 20% left


Ridgeline, Dmax, Ford 3.5
Oil Whisperer!*Fear the DINO*
Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: wwillson] #5251725 10/27/19 10:26 PM
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BlakeB Offline
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My 2017 had 20% fuel filter life when I bought it, I ran it down to 0% and changed it.

I bought it 12/29/18 with 10,345 miles and 401.3 Hours, 20% Fuel filter life.
Fuel filter changed @ 0%, (5/13/19) 12,852 miles and 522.4 hrs.

I currently have 17,336 miles and 796.3 hours with 58% fuel filter life remaining on the DIC.

I’ve put 6,991 miles and 395 hours on my truck since I bought it. I used 20% on the original filter and I’m down 42% on the current one. That’s 62% fuel filter life used since I’ve had the truck.

I keep a fuel log, I’ve ran ~686 gallons of fuel through the truck in 6,991 miles and 395 hours.

If the fuel filter life is calculated by gallons used, then in my case 11.07 gallons used represents 1% of fuel filter life.

If the fuel filter life is calculated based on engine hours, 1% fuel filter life is 6.37 engine hours.

If it’s based on miles, in my case 112.76 miles represents 1% of fuel filter life.

I calculated this based upon my usage and records on the truck since I bought it. If you calculated it based upon the first 80% of fuel filter life from before I bought the truck, I’m sure you’d get something different.

I do know that you can see actual fuel pressure and commanded fuel pressure on a good scan tool, so maybe the ECM can monitor or calculate the fuel filter life based upon the fuel pressure/flow drop over time. It would be interesting to know, that’s for sure.

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Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: wwillson] #5251728 10/27/19 10:28 PM
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JHZR2 Offline
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Pretty black, but not sure that by itself means much. Good question on what the algorithm goes by. Wonder if there’s a pressure sensor somewhere that is tracked. I pd have to guess that the IP wants the lift pump to provide in some pressure range, and as the filter gets dirty,,perhaps that supply pressure drops.

Is that a cartridge filter? Or was it cut open? Makes me want to go change filters on all my diesels!

Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: JHZR2] #5251732 10/27/19 10:34 PM
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BlakeB Offline
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Originally Posted by JHZR2
Pretty black, but not sure that by itself means much. Good question on what the algorithm goes by. Wonder if there’s a pressure sensor somewhere that is tracked. I pd have to guess that the IP wants the lift pump to provide in some pressure range, and as the filter gets dirty,,perhaps that supply pressure drops.

Is that a cartridge filter? Or was it cut open? Makes me want to go change filters on all my diesels!

It’s a cartridge filter, I posted one in this sub forum a while back from my 2017. I think the lift pump is supposed to supply the high pressure pump (injection pump) with about 60 psi.

Re: 2018 L5P Duramax Fuel Filter (TP1015) [Re: wwillson] #5252712 10/29/19 06:25 AM
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dnewton3 Offline
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Looking at this filter, there's little ability to discern efficiency or dP from a color change.

I believe they changed the fuel filter system design with this latest generation of Dmax (L5P); it's cartridge. The previous generations were spin-on systems. I also think the new gen Dmax has a lift pump; the previous ones did not. They also reintroduced the fuel cooler; mine had one, then they quit installing them, and now they are back. CAUTION - they rust badly and need checked in areas where salt is present in winter. I see the cover has a WIF drain, but no WIF sensor, like the older models.

Not sure how the fuel filter life is calculated. My old Dmax (LBZ from 2006) seemed to simply run by miles driven, regardless of other inputs. The new systems might be "smart" systems, but I cannot say one way or another.

Last edited by dnewton3; 10/29/19 06:33 AM.

The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
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