The missing o-ring! 2001 Cummins 8.3 ISC Fuel Filter change part 2

[@davesministry7789]

Intelligent people take advice from those who know. Good job, that's why we watch you. Keep going.

[@100SteveB]

That inner o-ring will stop unfiltered fuel from passing through those threads. Quite common to have some kind of seal on the inner pipe on those type of fuels filters. Your fuel tank is obviously fairly clean - seeing that you have had no issues. Glad you spotted the issue though, you never know when your going to get a bad tank of diesel from somewhere.

[@jamesrossmotors]

Awesome that you shared this. We all keep learning and thats the beauty of your channels. Seems to be many myths about that o ring so i hope to clear it up. Air is not a problem. The problem only arrises when the fuel filter has done its job over time and starts to become restricted. That is when fuel will take the easiest route and bypass the threads and the ugly part is that it will mix with dirty fuel that is in the filter. Thats when your injectors start to take a beating. Hope this makes sense to everyone. A quick note. All spin on filters will bypass fuel and oil via the threads when they become restricted. Cummins realised this many years ago and surprisingly other manufacturers have not followed suit. The answer is to change your filters when they are due.

[@travisoliver6349]

i run heavy equipment and on the Cummins, i used several filter changes no problems, then one time my machine would stall intermittently, someone mentioned the inner oring so i installed it, no more problem, must have been drawing air, now i always use it.

[@baxrok2.]

Live and learn, that's life. In the end we all win by helping each other! Thanks Paul.

[@marcinmorris]

Don't worry, we are all humans. I think all the viewers still appreciate your hard work you put in all your videos. Good luck, cheers :)

[@skyking4501]

Hey brother, no apologies needed, you are doing your own maintenance. Gotta love that. I do mine also. I was an owner operator and had a Pete with a Detroit engine. I just love fooling with those Diesel engines. Safe travels man..

[@tpcoachfix]

Whew, I am so relieved that you went back and installed that O ring, now I can sleep tonight. All joking aside I have worked on Detroit Diesels since the 1970s and never saw an O ring like that on their fuel filters. I started a job two years ago working on buses with Cummins engines and saw that O ring on their fuel filters.

[@OrbiterElectronics]

The man that doesn't make mistakes has never been born Paul, so no worries mate.

[@mobilemechman]

Only one. Jesus.

[@OrbiterElectronics]

As you'll may know Jesus was a carpenter, and apparently it was known that he was not a.. shall we say 'specialist' as he did indeed make mistakes. Although I'm thinking that this was not his specialist field. And he had far more important things to work on :)

[@danielvelez2857]

My experience is with much smaller car engines. I never put that o-ring on because sometimes it prevents the outer one from sealing properly and lets air enter the system; never had an issue and bear in mind that we have extremely low quality and dirty diesel down here in south America.

[@vegasfordguy]

At least you showed what really happened and showed the correct way to do it. As a few others have stated, keeping the fuel CLEAN is super important on a diesel as injectors are very expensive and a small particle of dirt is all it takes. ALWAYS ENJOY YOUR VIDEOS!

[@viz_aviz9189]

Hi Paul greetings from UK. I think nearly all our spin on fuel filters have a seal in the middle (example ESR4686 ) But ours are fitted in a slot the same as the outer seal.The reason they say don't fill filter is you are pouring in unfiltered diesel which can have micro particles in which score the fine tolerances in the pump and injectors and ruin your day and wallet. the modern pumps piezo injectors running at 8000+psi are even more critical as micron particles at them pressures act like a sand blaster that blast away all needle injectors and nozzles in no time at all which will ruin your day and wallet big time.Hope this helps Tim

[@Travisfromoregon]

Hi Dan, I work for a Cummins, Cat, International Dealer. The quad ring is for sealing filtered vs unfiltered fuel. On another note on some of these motors cycling the key on will run the lift pump, on others you will need to bump the starter motor with the key and the ecm will run the liftpump. So if you run into another medium or heavy duty engine and are testing a lift pump make sure to bump the key.

[@ScannerDanner]

Great tip, thanks brother! Oh, and my name is Paul (Danner is my last name)

[@Travisfromoregon]

Sorry about that Paul. lol Been watching your videos for years. :)

[@ScannerDanner]

It's okay. I get Dan all the time :-)

[@julianparrott]

Danner its so cool to see your hands dirty. But anyway the fuel comes down the centre of the threaded part, in to the filter, through the filter paper inside the canister then out the holes in the rim of the filter to the fuel rail. So if you haven't got the O ring in place then fuel can come back up the threads and mix unfiltered fuel with the clean filtered fuel leaving the filter housing.The O ring has to seal the top of the canister to the roof of the filter housing, No need to be tight because it squashes and expands. Its such a small amount its hardly worth worrying about, and most after market filters wont have the extra seal supplied, But genuine always is best quality and go the extra mile. Good on you Danner. Getting it done and doing it right .

[@wyattoneable]

Great save and thanks for bringing that back to our attention. Otherwise a lot of us would have never known about that issue. I'm glad the family is enjoying the coach, it's a beauty!

[@SuperSecretSquirell]

I work on a lot of Cummins engines. Some of them come from the factory with the small gasket, some do not. Never had any issues with leaving them out if there wasn't one to start with.

[@RDY2RN]

same here, put it on or leave it off doesn't matter, I've changed them with it and without it all the same.. I wouldn't get worked up over it at all

[@zardow365]

Heyyy Paul, even though I have seen the O-ring groove in the first video and I was shouting out there, but I can't blame you while for not recognizing it. I can't because I was behind the screen and you were are filming, wrenching, talking, and in laying in positions that is hard to see the groove. Also, the maintenance manual say nothing about it as well as the printed instructions on the filter it self. So, do not go hard on yourself, you didn't loose your mechanic touches even though you are working on electrical systems and diagnosis more often lately. I believe every one makes mistakes once in a while, but not a lot admit it, not to mention posting it on the web to. So, great job and I appreciate your honesty. THUMBS UP.

[@timstanford3443]

Paul that oring just seals between the filtered non filtered side of fuel filter. I have seen lots of people not use it, but it should have it

[@TheWrench97]

Working in a fleet shop for 30+ years I've seen a lot of cumins filters come off missing the inner seal It is there it prevent the filtered fuel from mixing with the unfiltered fuel, when the filter is tightened it squeezes between the top of the filter and the filter housing to seal, if you have good clean fuel and clean tanks no harm no foul. They warn against pre-filling because most do not pre-fill with filtered fuel or some pour the dirty fuel out of the old filter into the new filter small bites 4 micro in size can past through the pump and damage a injector.

[@ScannerDanner]

That's crazy! How does the injector get damaged? Restricted I could see but damaged? As in needs replaced? I have to study up on my diesel injectors!

[@TheWrench97]

small particles in very close tolerance moving parts cause the plunger to seize or the nozzle to plug up or in a worst case blow the tip off into the piston. Depending on the year it's either a common rail system with electronic injectors , which like the newer Fords use engine oil pressure to develop injection pressure or the older Bosh pump with 6 lines coming off one to each injector the bosh system will get to 2500+ psi at the injector tip the common rail set up closer to 4000 psi

[@lucianlucian9911]

You are correct Paul, but in addition to the fact that they get restricted, dirt could damage the entire injection system as the fuel also plays the role of lubricant of high pressure pump and injectors (of course lines and common rails too, depending on case). At least that's the way I see it.

[@trainer2018]

Hey Paul that small round O ring is important. The fuel goes into the small holes around the big hole, goes down the filter, goes through the element, then back up to the top. If you don't have the o ring as others have mentioned the fuel will the filter and it will also cause a air gap which will make it suck air and cause cavitation. Not good for a caps pump. Do you know how old the injection pump is? If it has some age to it let me know and I can show you how to do some checks on it to make sure it is ok so you don't get stranded someday.

[@skyking4501]

Hey, bus jockey... that would make an awesome video man!! I’d love to see that!! Or just hear the information in a video... think about it..

[@thomastow9595]

Great video...REALLY helped me...going to do this today...My ISC has two of those filters up, one on each side, reach in from rear location... no luck finding a service manual...still trying..... I hope simply replacing both..the same way as this is the deal..With no service manual your videos are really THE helpful deal ..Tnx

[@mobilemechman]

Where I work we maintain 9 forklifts with that engine. I have personally serviced a couple where that seal was forgotten the last time it was serviced with no apparent ill effects. I know it serves a purpose, and I always thought it was to keep unfiltered fuel from the injectors, but it may be a very small quantity. I don't know. Maybe Busjockey could chime in? He's awesome on these engines.

[@sneaks01]

Don't be embarrassed! Thankfully, we all continue to learn new things!! Great vids!!

[@roadboat9216]

First video was great but the follow-up fantastic!

[@carlupdegraff5269]

As a guy who works on Cummins engines every day, I knew exactly what that o-ring was. The tune is different on an isc vs an isl. That inner o-ring separates filtered fuel from un-filtered fuel, the outer seal keeps it from leaking. In an H.D application the demand for fuel is higher. And if the commanded fuel is to far from measured fuel. You will have your self a big ol headache.

[@tjsean0308]

Very important oring. Stops the filter from bypassing particles through the threads that could be above the filter size. Its loose on the shaft so the oring will self center and seal on the body of the filter. Source: Cummins certified tech.

[@danekeeper1]

It's ok....Mistakes are a higher form of education..everyone who watches this will never forget that square "o" ring....ever.

[@mysterync]

We've had quite a few of those fuel heaters fail and suck air or actually start a fire. They can be difficult to locate if they're the same one found on the 5.9l 12v trucks.

[@SmittySmithsonite]

What a beautiful sound out of that Cummins! Bet the exhaust still smells good too, since there's no emission crap clogging up the works. Can always tell when you're following a modern diesel - they smell funny, and it's not pleasant. The old ones always smelled great, IMO ... guess it's a "mechanic" thing. :D Nice save on the o-ring. I doubt anything bad will happen from that, since the diesel fuel these days has to be 100% PURE ultra-low sulfur, or these modern diesels will melt down, thanks again to the aforementioned emission crap. Anything pre- EGR & DPF will be fine. Can even run used motor oil mixed with unleaded at a 5.5:1 ratio - maybe not in your motor home, but the mid 90's and back would handle it. That's REAL recycling. :D

[@JohnDoe-uq3mx]

ScannerDanner, I seen have seen alot of flat towed vehicles tear the rear of their aluminum tailshaft housing off because of lack of lubrication, if that makes any sense. Alot of people have disconnected their driveshaft prior to the long haul, but mainly if it's an automatic, and only if the rear wheels are spinning when towed for long distances.

[@chsonnyboy5]

Also always cut old filter apart an check for what filter might have captured such as algie.

[@rhkips]

Once the system is purged of air, there shouldn't be any air in there to sneak by the threads. My best guess is that it prevents unfiltered fuel from bypassing the filter element. Diesel fuel is significantly less viscous than oil, so it would be more likely to wick its way between the threads, even if it were in very small amounts. :)

[@paulpreston9555]

Why doesn't it show the o-ring in the service manuel?

[@TinyTubThumper]

Great video Dan, thanks for sharing!

[@emtscythe3782]

Not su if you had to order that Fleetguard filter off Amazon and wait for it, the cross Wix filter is a 33422 which you can probably get at your local parts store and comes with the new sensor and the thread gasket.

[@gvvq-pi5ml]

Hi Paul, well either your vehicle doesn't use the ring, or someone in the past left it off,, i have heard on cars of starting or running problems without it....Fred in England.

[@amadafaka]

Thanks for sharing this video. Your community apparently cared enough to help than keep cracking jokes about your sandals which is hilarious. The only way to create results is to fail. Once again thanks for everything.

[@williamcolantuoni4503]

Ok sorry. Didn't read your post right. You are correct.

[@ScannerDanner]

I figured you read it too fast. It was a good comment.

[@luisbaez88]

im lost in diesel engine but the way that seal sits in top of the thread applying the logic looks to me to prevent diesel been already clean dont mix with dirty diesel coming from the tank

[@timowallin8020]

Yes the O-ring gos to the middel. Never sean one missing so i ges if i didnt service allso disel cars i would have missed it as last worker droped it on starter or some thing. I dont know but. I quess ass it needs to filter thinner fluid then oil. It needs that O-ring to make sure non filtered fuel cant pass through... And that H20 drain port is for "winter service" (Before Freezing times) on any diesel car. So you can make sure your car can start in winter. That is if you didnt get water in your dieseltank on last fuel up and that the diesel is rated for winter use...

[@andrewthompsonuk1]

There would be another filter at or in the injection pump that would be capable of catching anything that passes through the threads. Feels better to do as the engineer wanted. I can't imagine that thing ever seeing dirty fuel.

[@ratbag359]

I Think the engineers are concerned about particles getting past the treads that are above the filter size.

[@matutenoel4833]

good video amigo exselente diagnostic

[@PeteJacksonPapasVlogs]

Here is my thought... It's more likely that the smaller O-ring seals the threads of the mounting against any unfiltered fuel making it's way past the threads. Just as others have said.

[@renewedautodiagnostics6525]

to think of it, it's weird that automotive oil filters don't have an o ring near the threads. Do they allow unfiltered oil to bypass?

[@kellykathymcdaniel7834]

Good catch. I saw that groove and figured thats where it went. Better to eat a little crow than put out a bad vid. Kudos

[@tonysherren3048]

Hello. Great video. Very helpful. Would you be able to post the publication number for the ISC 330 service manual that you were referencing, please. I have the same engine and I would like to buy one.

[@ScannerDanner]

I sold the RV. I'm sorry 😞

[@tonysherren3048]

@@ScannerDanner Okay, thanks

[@RNMcustom]

Did it even show that little o-ring in the manual that you were looking at on the first video, on how to change the filter?

[@00freeguy00]

jumping off topic looks like you need a valve adjustment from the ticking noise when you got the engine running

[@stigonutube]

sweet sounding rig, hey don't worry shit happens.

[@waitemc]

It also keeps fuel from running back into the tank when engine is off.

[@codo7]

There were no issues because of high cleanliness standards involving the fuel sold. It is rare that you buy dirty fuel. You forgot the o-ring but the fuel has been clean anyway.

[@PaulCTownsend]

Good job

[@JohnDoe-uq3mx]

ScannerDanner, it's all good. But have you been through California and Arizona?

[@wilmerduran19]

son tonterías que lo hacen hacer un trabajo erróneo cosas pequeñas que por pasar en alto dañamos un vehículo buen vídeo lo felicito

[@IntradeMotors]

correct unfiltered fuel but s.f.a as the thread tension would Seal also almost fully with no seal . Prefilling fuel filter can be done if you do it correctly there is a guy making cat Diesel vids who shows how and why you would prefilling a Diesel fuel filter. and I fully agree with him.

[@danwill8581]

Hey Paul, talking about flat towing your Jeep, is it an automatic one? if so how did you do it?

[@ishdhillon4145]

My Isuzu 5.2 has same concept different style ring and a mechanic threw away the ring it was a oem factory ring I’ve been running without it ever since wish he never threw it away cause I’ve never been able to find another one

[@ScannerDanner]

New filters always came with one for mine

[@chedons91]

tractor fuel filter has o ring there, all what it do is stop unfiltered fuel to pass to injectors..outer o ring is for air..

[@Badgertronix]

It definitely looked like it belonged there but weird it's so loose

[@ratbag359]

sealing surface will be filter holder and filter

[@guayaba2528]

I have seen that o-ring missing before when the driver is complaining of too much black smoke coming out off the tail pipe

[@gillesplante8262]

The o ring is to prevent bypass fuel

[@frankgonzalez24]

You can't call yourself a technition or mechanic if you've never messed up.

[@marlinpruett8343]

Don't be embarrassed, I changed mine 800 miles back and did not use the o ring. I have my o ring, It did not have one when i took it off. I have changed this filter at lest 7 times. ok go put it on. I am 78 and i do my own maintenance.

[@guayaba2528]

that means that fuel diesel has been unfiltered to the injectors causing further damage to injectors

[@rayboat1944]

very cool

[@larryreeves2548]

Did you find a second fuel filter?

[@chsonnyboy5]

My 8.3 has 2 filters an i am not sure what is the final filter no .I think who changed them has them reversed Final presently installed is 33422----first from tank is 3422 i think both being Napa filters. I have available Fram ps6829 an i think it is final filter an a Napa 3422. Appreciate any information on that.

[@ScannerDanner]

I'm not the diesel expert man sorry.

[@willemstreutgers1154]

Well the former owner drove without the ring. I asume there might be some(little) bypass of fuel which was not filtered, so what.

[@cypeman8037]

Charles the humble mechanic suffers from the same problem as you Paul, he also can't afford footwear and does his repair work wearing cheap flip flops. Lol.

[@waltershulas623]

I like gold fish good vid Paul

[@ScannerDanner]

Pizza ones too :-)

[@waltershulas623]

Thanks Paul for putting out your videos I've learned a lot I've been work on cars 25 year and you never to old to learn something new now only if I can get my 2001 Tahoe problem fix I'd be ok at 2500 rpm the check engine light blinks pulled the code multiple miss fires I'll still working on it testing every chance I get thanks again God bless you and your family say hi to your brother for me

[@dannyprimeaux4184]

Don't you just love the smell of Diesel

[@billrimmer5596]

no

[@mikepratali5582]

You think that with all the graphics on the side of the can, they would've added that too the picture...

[@johnc4352]

Bro! Did you really put the old filter back on?

[@stradplayer90]

My thoughts exactly. It's his first diesel so he doesn't understand what's at steak from even one piece of contamination large enough to hang an injector. Doing fuel stuff on my trucks stresses me out for that fact alone. His saving grace is that I don't think that year had a cp3 so presumably it's more robust against contamination than the common rails.

[@paulcopeland9035]

steak?

[@julialeslie9213]

stake. it tastes good when you do it right.

[@chatsworth777]

If you leave it off, the fuel circulates without filtering.

[@hereandtheretrucking]

I went to the garage and the same thing happen...the mechanic didn't know what the extra ring was for...

[@monza1399]

unfiltered fuel it is... some of the after market stuff do have a different thread or more loose than oem, so there is a possibility there... in terms of an air may sneaks there... i totally disagree... diesel engine may stall when its come to an air present in the system...

[@melissadufresne9969]

You didn't waste an hour and a half scoping the seal, though.

[@tubester4567]

If the o ring goes there, why dont they show it on the directions. Im not convinced.

[@JohnDoe-uq3mx]

The O-ring keeps fuel from backtracking through the threads from what I seen in that last video. I'll be honest, I'm no expert myself. These are Class A motor coaches with air brakes.

[@bobl78]

just because it worked for 6000miles does not mean that you do any good to your injection pump or injectors if you leave it out. If it is there to prevent bypass fuel then you need to put it in or you risk issues in case you have any Kind of dirt in your fuel. It´s not embarrassing because errors are human, even to professionals

[@johnmckamy6398]

maybe it bypasses the filter

[@WarpedSpeed]

fastest way to find out how to do something right is to do it wrong and post it on the internet,

[@ScannerDanner]

100% 🤣

[@toddhefer6084]

God Bless in Jesus Christ Name Amen.

[@cypeman8037]

Is making a video followed by an addendum going to be the norm?Just kidding......lol.