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Old 08-08-2018, 01:15 PM   #1
dpam
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When to replace diesel fuel filter

I have a 2017 GMC duramax diesel. The DiC states I have 35% left before the fuel filter expires. So, when do the majority of the MOC members change out their diesel fuel filters? Please advise at what % you change your diesel fuel filters?k
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Old 08-08-2018, 01:26 PM   #2
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If were traveling and going to many different stations, I will go buy the recommended change on both the main and water separator. If i stay around home and use a station that i know has good clean fuel, i will change the water separator filter every other time. But will change the main filter everytime as recommended at around 10% life left.
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Old 08-08-2018, 02:34 PM   #3
PNW Fireguy
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Every 15k per Manufacturer spec. If you use questionable fuel source or bio dieselshould be changed more often
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Old 08-08-2018, 03:36 PM   #4
dannyrver
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Got 12000 on my 2017 Chevy when I had to change. Carry a filter under my seat now for emergencies.
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Old 08-08-2018, 04:51 PM   #5
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For my 2006 I do it every second oil change. For me, this averages out at about 14000-15000 miles between fuel filter changes. If the DiC indicates less than 20% life remaining I change it regardless of how many miles remaining to reach 14000/15000 interval. I'm not comfortable running a fuel filter too low a % life.

As others have said I too carry both a spare fuel filter for when they are not readily available.
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Old 08-08-2018, 05:01 PM   #6
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Agree with PNW Fireguy - About 15K miles
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Old 08-08-2018, 05:56 PM   #7
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It varies depending on fuel quality. Follow the DIC, but I don't let it get below 10% filter life anymore, after it went into limp mode on US 95 in Nevada. Luckily I re-set the code and made it to my next stop where I bought a filter and put it in myself at the park. I always carry a spare in my tool box.

The reason I say follow the DIC, is because it is the best indicator of how dirty the filter is. Mileage alone is meaningless if you just replaced your filter and then bought a tank of bad gas. I've heard stories of exactly that happening. When it is time to change the filter, do it yourself at least once, in the comfort of your driveway. It's not hard. That way when you have to change it at a rest stop in the middle of nowhere, in the rain, you won't have to learn on the fly. Lots of how-to videos on youtube.
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Old 08-08-2018, 10:25 PM   #8
rohrmann
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I've been getting mine replaced every 30K, along with the air filter. I was getting the spin on Allison filter replaced at 30K also, but I change that out now with real Allison filters at 1/4 the price, and it usually only takes a few minutes. Have almost 200K on the truck, and have had no filter related issues with anything. Never get even close to 25% on the DIC for any of the filters.
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Old 08-08-2018, 10:51 PM   #9
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Every 22,500 closest to an oil change.
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Old 08-10-2018, 07:24 AM   #10
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I have the same truck and had mine done at 15 percent. Then had to have it done twice more had a code for water in fuel. Found it was a censor
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Old 08-10-2018, 01:05 PM   #11
Mikeblan2000
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I have a 2017 ram 2500 with the Cummins.
I change the fuel filters every 10 to 12 thousand miles no matter what percent of filter life it shows left. My owners manual says 15000. Diesel fuel is very dirty. I carry extra filters with me at all times as well. Have to expect the unexpected when traveling.
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Old 08-10-2018, 04:43 PM   #12
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it's time.
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Old 08-11-2018, 09:19 PM   #13
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I have a 2017 3500 Duramax and changed fuel filter at 10,000 miles and will continue that unless any indication it needs sooner.
Was thinking of doing the conversion to the CAT filter because of twice the size for more filter area.
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Old 08-12-2018, 05:52 AM   #14
Phil P
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Hi

I supervise the maintenance of a fleet of off road equipment.

Tractors changed every 500 hours.

5 7.3 ford diesels only changed if water light comes on or fuel restriction. Some times as much as 3 years between changes.

Stationary engines every 500 hrs and these run against the governor or wide open full power sometimes as long as 7 days 24 hrs a day.

We are getting 20 plus years between overhauls.

We actually get less time out of exhaust system than we do most anything else.

The fuel filter on our Silverado gets changed when the display says 10% life left.

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Old 08-12-2018, 07:42 AM   #15
K0LCB
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I always changed mine every fall, never put 15,000 mike a year on the truck
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Old 08-12-2018, 09:04 AM   #16
socoinc
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I change my oil on my Cummins motor every 5000 miles & fuel filter every other oil change. On my big trucks with Cummins ISX motors every 10,000 miles
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Old 08-12-2018, 12:40 PM   #17
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These new common rail fuel systems are extremely fragile. The older fuel systems were much more robust. The gear system of the older Cummings and the Cat designed 7.3 Ford systems almost couldn’t be hurt. These new Bosch systems that they all have run at 25,000 PSI and over and will not tolerate any abuse from contamination from dirty fuel or water or being starved of fuel. You can’t change the filter too often. I like to carry an extra set of filters with me. You can’t ever tell when you might get dirty fuel or water in your fuel. When the high pressure fuel pump goes bad most of the time all of the injectors haft to be changed along with all the fuel lines. Most of the time this will cost 6 to $8000 dollars. So be careful this can get in your pocket book, deep.
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Old 08-13-2018, 06:44 AM   #18
Phil P
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Quote:
Originally Posted by mlh View Post
These new Bosch systems that they all have run at 25,000 PSI and over and will not tolerate any abuse from contamination from dirty fuel or water or being starved of fuel.
Lynwood

Hi

This is just one of those things that are rumored.

The truth of the matter is the Bosh system had its problems in the beginning like any new item on the market.

By late 2007 Bosh had it pretty much bullet proof.

The ranch Duramax water contaminated to the point it quit running. Drained water changed fuel filter, installed fuel pump in frame, washed system with miner spirits, changed fuel filter again, installed water separator/ fuel filter in return line at front of fuel tank in front of fuel cooler then started engine on a mix of fuel and 80 wt oil.

Almost a year later it is still running strong, the truck never sees a paved road.

Second one I didnít do the work but was performed by an outfit that specializes in complete deletes on new trucks.

2017 F350 the ownerís wife put DEF in fuel tank drove until it quit. They drained the fuel system and washed it out with water and performed some additional maintenance procedures that I am not fully aware of but did not change any major component that was now 5 months ago the truck is still running.

You have to remember that a lot of the parts changed by a dealer or commercial truck repair company is to prevent the problem of the owner coming back with a failed part that was not replace at the cleaning process and wanting the shop to do further repairs free. This results in the 6 to 8 thousand repair cost.

I have a friend of mine that is a shade tree mechanic that does things I would never attempt. He disassembled the pump on a 2004 Duramax and replaces some needle type bearings buy reaming the housing so he could use bearings that were available and has the engine running again.

You will find in the future more of these examples once the mechanics in the field get more acquainted with them.

Phil P
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Old 08-13-2018, 07:23 AM   #19
Dave W
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Ford says every 3rd oil change though the info center will probably tell you to do it sooner. I generally do mine after the second oil change(~15K miles) though the last time was 20K+. The primary filter housing had no dirt or water so suspect that these mileages are CYA. An that Ford primary filter - you had best have a spare plastic cover, WIF sensor and drain on hand since that bottom nut likes to break off regardless of how gentle you are as I found after a diesel fuel bath and a few gallons of dumped fue that ended up in my tractor. You better believe that those Bosch HP pumps are fragile, regardless of truck brand. They will not tolerate much in the way of dirty fuel.
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Old 08-13-2018, 09:57 AM   #20
mlh
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Phil it’s not a rumor when Ford requires a picture of the inside of the high pressure fuel pump before they will warranty it. If there is any sign if rust of dirt sorry you are on your own no matter the mileage. It’s abuse according to Ford.
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