Def pump replacement on a freightliner cascadia. 4374/0 5435/7

[@pound4pound380]

I'm at the mechanic now and they tried to lie to me saying this job takes 5 to 8 hours. It's a doggy dog world. This is why videos like this are so important to liberate your mind

[@bustedknucklebydieseldr3228]

You Gotta keep in mind what the SRT is compared to what the job actually takes are completely different numbers. So that might be where the difference is.

[@joegibson3019]

Be mindful u have to drain the coolant which was probably already done before the video an then refill an purge. Or u can try to be quick and make a huge mess an be covered in coolant which no one likes

[@tylerseabook9423]

You mean dog eat dog world 🤦‍♂️🤦‍♂️

[@tylerseabook9423]

@@joegibson3019 no you don’t. You clamp the lines off 🤦‍♂️

[@truckerlifein3]

It took me 2hr to change 😂 and im filling like engine from where antifreeze runs true.😂

[@dropnhook2443]

Best Freightliner tech

[@bustedknucklebydieseldr3228]

Thanks for the positive feedback. Just a guy trying to save people money

[@jaquanjohnson3529]

Where you located?

[@steveharriscamaro]

Thanks for the info, helped me out allot hopefully it fixes the issues I'm having with this truck

[@bustedknucklebydieseldr3228]

Appreciate the positive feedback. Exactly what I need to stay motivated and keep the channel going.

[@adolforamirez5197]

Thanks for your videos!

[@ryansutherland2715]

Thank you your video helped me

[@nadeemzafar9518]

excellent job thanks

[@Mike-o3f6y]

Can you show us the self priming routine on diagnostic link

[@mynoel07]

Ty for help is very well

[@TimPittman-v7w]

Can you prime it with air after it has already hooked up? Or unhook coolant, etc, then prime?

[@bustedknucklebydieseldr3228]

Great question, yes you can. On the newer ones there is even a prime routine thought the computer if you can get your hands on one. They tried to make it a bit easier since most people weren’t using regulated air in there.

[@artme-v2b]

So I did oil change they changed def filter and didn't put it on right was leaking nobody had the filter so 500 miles later and 100 bucks in def fluid later I found a petrol and they changed it but ever since that I'm getting bad fuel economy I was doing 10 9.5 empty now I'm 7.5 empty 6 loaded when it was 7.4 loaded would the def pump have anything to do with it I did valve adjustment before this truck was ok I'm going to clean dpf I cleaned all sensors as well before this and everything was OK now bad mpgs

[@robertovillalon2841]

Thanks!

[@JohnnyParedes-nt9ht]

thanks for the video

[@truckerlifein3]

Don’t forget, if you up to change by ur self antifreeze will pore down from right 2 hose.

[@bustedknucklebydieseldr3228]

That’s why I mention to do one of three things. Drain system. Vacuum system. Or pinch of hoses. One of those will be the lifesaver

[@JulioRodriguez-ue2vq]

Can I replace it without doing that prime computer thing I’m replacing it on the side of the road

[@bustedknucklebydieseldr3228]

@@JulioRodriguez-ue2vq great question. Yes you can do it without a computer. But, you may have poor performance from it as the internal bladder may not fully inflate

[@redjeb5833]

Thank You!

[@2542mly]

Bro do you know the part number for the elbow that runs from the heat def line I have 2022 Coronado

[@bustedknucklebydieseldr3228]

@@2542mly thanks for reaching out. I hate to give our part numbers because they change and superceed so much. Plus I’d hate to give you the wrong number and waste ur time. Call it local dealer and get part number specific

[@Leakproof-ne8pb]

When you take off the coolant lines, did you drain the coolant first? I’m an intern at a Freightliner place. And the tech say you usually don’t get enough time to drain it so you got to be quick on the coolant lines and put them on the new pump while it is pissing coolant

[@bustedknucklebydieseldr3228]

Great question, if you looking to save time the best thing to do is get a vacuum pump and attach it to the coolant reservoir. Instead of doing a coolant system pressure test it will be doing a vacuum and hold most of the coolant in place. As long as ur quick there won’t be much spilt.

[@powerbeast5691]

Detroit Diesel says inflate to 40-46 psi, you say 90 psi / 3 seconds? My DEF pressure is over the acceptable link according to DD, could this be caused by incorrect bladder pressure (or maybe busted bladder)?

[@pholyiv4322]

Hey Bro. 2018 western star 5700xe.." Codes is " SPN 4374 FMI 0" and code say "DEF PUMP SPEED is HIGHER then NORMAL".. This is a bad pump?? Also the DEF PUMP is leaking Def fuel from the 2 black circles looking thing on the unit itself. ANY IDEAL??? THANK YOU.

[@bustedknucklebydieseldr3228]

Thanks for reaching out. With that code I would definitely check the def pump for leakage. Since you found some the only fix is replacing that pump. After that you would need to run a a self check to clear the code.

[@dramatube00]

lets start shop together 50/50,, where are you? NJ area?

[@bustedknucklebydieseldr3228]

Good plan but damn far away. Az.

[@brianstewart9363]

After i put it on run a ads.. hiw u do that

[@steveowens3142]

How do you know when it going out thank you

[@bustedknucklebydieseldr3228]

Realistically you don’t. Either it leaks out or it throws a code.

[@juntong651]

I have 2014 cascadia and have a engine light came on and one time lock speed to 55mph ， engine code is spn 4334 fmi 7 DEF pressure low ， DEF pump is Different than the video you have , do you have any idea whats going on , or do you have any videos about this code please let me know thank you 🙏 you

[@bustedknucklebydieseldr3228]

With this code you would need a computer to test your pump, def flow, and doser. One of these will be your issue. If you haven’t changed your def filter in a while that could be clogged up as well.

[@aimstrucking7686]

Thank you for the video. Always enjoy watching and learning from your videos. Can you make a video about Volvo dpf filter removal and clamping back on please

[@johnbuitragoqww7958]

Hey man . I changed the def pump and still got the code 4374 fmi 0. Also i noticed that the def is not going down. What else should i check? Thank you

[@bustedknucklebydieseldr3228]

Thanks for reaching out. That code is not going inactive until a few tests are ran through a computer. Such as scr system ads self check or scr eff test. The System needs to know that everything‘s working before it goes off.Hope that helps

[@johnbuitragoqww7958]

Oh okay . I have an otr performance device. Do you if is there any way to run that test with that device? Thank you man.

[@thedieseldiva1844]

@@johnbuitragoqww7958 did it work for you

[@FerOrtegaif3r17]

@@johnbuitragoqww7958 Did it work with the OTR tool?

[@amritmattu5024]

What does it mean when i get a reading . Def plausibility value high

[@bustedknucklebydieseldr3228]

Must be using a generic software to read this. Usually Detroit or Cummins software doesn’t use plausible codes. But it’s saying it’s reading out of specs high. Such as it’s out of limits and most likely needs the system tested to find where the failure is.

[@amritmattu5024]

@bustedknucklebydieseldr3228 outlet nox was bad causing the def metering valve to dump more def

[@johnbuitragoqww7958]

I have code 4374/0 in a cascadia 2016 DD15. I checked the def pump . Nothing is leaking . I chaged the def filter. Lights still on . I have 25%derate. And i feel like the truck is not consuming the def. I have been runing the truck for a week and half and the four bars are full. I putted def and the thank is full after a week and half of runing . Any idea what can i do? Thank you

[@bustedknucklebydieseldr3228]

Thanks for reaching out. If that code is active then there is something going on with the pump, def doser, or lines. A computer would be your best tool as you can run pressure tests for the system. Pump may not be running and doesn’t have to be leaking for it to fail. Or def doser could be pushing too much out Without a computer it would be a guessing game. Gta give it to you honest.

[@johnbuitragoqww7958]

@@bustedknucklebydieseldr3228 run a pressure test is the same as do a force regen? Thank you for answer

[@bustedknucklebydieseldr3228]

@@johnbuitragoqww7958 a regen will put it under pressure but this specific test is a bit different. You would be able to test the pumps build up//press relief// stability//and bleed down.

[@johnbuitragoqww7958]

@@bustedknucklebydieseldr3228 i see. Im gonna do that . And see what happens. Thank you man

[@gushernandez4]

@@johnbuitragoqww7958did you ever figure this problem out, during covid a lot of parts were backorder, my mechanic said my pump was failing so I flushed the pump with warm water, these pumps are magnetic driven so def built up will slow them down or outright clog them

[@maddproff]

Whi h years is that part no good for?

[@bustedknucklebydieseldr3228]

I would always suggest you call the local dealer and get the part number for your vin because there not all the same and numbers superceed to other numbers. Would hate to give you the wrong info.

[@jorgerodriguez6470]

Good Video!!

[@dizseh]

To chenge pump need to dry all coolant from sistem or not ?

[@bustedknucklebydieseldr3228]

Three options. Drain the system….vaccum the system to hold pressure. ..pinch of coolant lines going to pump. Either one works.

[@DoctorDiesel711]

I never drain the coolant lol. You just gotta be quick!

[@bustedknucklebydieseldr3228]

Live life on the edge huh. Putting the system in a vacuum I would say works best. Minimal leakage and quick.

[@DoctorDiesel711]

@@bustedknucklebydieseldr3228 yeah the vacuum definitely does help.

[@asas-px8oz]

When coming cod 5435 FMI 7 how Many millage drive after the cod

[@gureyjama5798]

Great 👍

[@pound4pound380]

Question do you have to drain antifreeze out before changing DEF pump?

[@bustedknucklebydieseldr3228]

Great quest,, the right thing to do is drain the system of coolant. But you can put the system under a vaccum instead or pinch off the supply lines to the pump where they pass over the batteries. Either option works.

[@haris4623]

Which year and model this truck is ?

[@bustedknucklebydieseldr3228]

@@haris4623 2018 FTL cascadia. But the code is for the new and old body style cascadias.

[@MrRaider42]

What if I don’t have a way to inflated the bladder? Will it still work?

[@bustedknucklebydieseldr3228]

thanks for watching. There are two ways to inflate the bladder. Using a blow gun or through diagnostic link program tool. If you don’t have either one than yes it’ll work but just not at its best and may not have a full life. Hope that helps.

[@karanjitsinghdhillon234]

​@@bustedknucklebydieseldr3228

[@pound4pound380]

Thats quick

[@devonbmoore14]

With idle pressure fluctuations between 3300-3500mb and anything above idle defaulting to 500mb. Bad pump?

[@bustedknucklebydieseldr3228]

Great question,But when i test these pumps I look at psi and rpms.So pump speed usually around 145 and pump rpms usually 600 to 1000 shouldnt be erratic.Not to sure about MB

[@tsmjs4]

What about on a epa10 2011 def pump replacement, do you have to prime the system as well??? If so, what's it located under on diag link???

[@bustedknucklebydieseldr3228]

Great question, Yes you would still have to prime the system for best results.And it should be called def prime or an ads self check would prime it as well.

[@MuthaTruckinMom]

I'm trying to replace my pump my self. Where do I get the diagnostic tool to prime the pump? Is there a way to do it manually?

[@josephanderson47]

Where is ur shop located at

[@bustedknucklebydieseldr3228]

Great question and thanks for asking. If your interested in going to my dealer I’m at chandler freightliner in Az. Dealer prices are higher but we do great work. Stay safe out there

[@stevenbrewer7314]

What's the mileage for this failure?

[@bustedknucklebydieseldr3228]

This particular truck had 500k on it. But really it can happen at any miles. Thanks for reaching out and watching my videos.

[@1stunna79]

My def filter seal keeps breaking, I notice it happens whenever I fill the def tank, if I keep it half full it's fine, any idea why?

[@bustedknucklebydieseldr3228]

Great question, if you are indeed talking about your filter on the def pump itself. And it leaks from the filter and not the vents that are by it, than one of two things are happening. Either improper installation of filter and membrane or pump itself is failing and needs replaced. So you choose the best option and hope this video helps in either choice. Happy holidays

[@FusionKota]

​@@bustedknucklebydieseldr3228 I've got a truck in my shop that's got DEF built up around both def lines, coolant lines, and the all over the top of the pump. I'm assuming it's safe to say this pump has failed? Why would it leak so bad if it's not running?

[@bustedknucklebydieseldr3228]

@@FusionKota thanks for reaching out. The pump sounds like the most likely suspect. Def will return to the tank when system is not running so it shouldn’t be the lines. The pump has vents that tend to stick due to age cuz you know what def does. Crystallizes so things can’t close and seal right. I’d start there see where it takes you.

[@bustedknucklebydieseldr3228]

@@FusionKota great question. When you shut a truck down the def pushes itself by use of the pump, back into the tank. The pump stays primed in the filter area. Not running it shouldn’t leak. But it doesn’t take much for that pump to fail.

[@komalpreettoor390]

Code showing PUMP SPEED HIGH THAN NORMAL . What is supposed to do and speed is 55mph Should I replace it.??

[@bustedknucklebydieseldr3228]

Do you have a code number because this can go a few diff ways.

[@komalpreettoor390]

@@bustedknucklebydieseldr3228 sa 61 acm spn520342 Fmi-17

[@bustedknucklebydieseldr3228]

@@komalpreettoor390 gotcha. I want to say I did a video on this. I would first take off the def pump Cover and check for any leakage or any pinched lines. If that’s all good I would either do one of two things depending on what you would like to spend. Either replace the def pump which you saw the video on. Or replace all the def filters and pass throughs on the def metering unit. There’s a filter kit they sell for all of that. Little more extensive but usually cures the issue, which is the pump is not maintaining it’s requested speed. So whichever option you choose I believe there’s a vid on both. Hope that helps.

[@moonrunnerlife1640]

Imo the problem will be inside the def tank itself having to do with the def quality sensor or flush with water and new valve is good idea

[@trustinthelord2248]

Why u thk that

[@moonrunnerlife1640]

@@trustinthelord2248 I've replaced everything in the def system at this point. But now it may only be a ghost code so I'm unsure.

[@tylerseabook9423]

@@moonrunnerlife1640 if you have replaced everything and it’s still there then it’s a cpc issue.

[@Izm100]

@@moonrunnerlife1640 Hi did you solve the issue back then?

[@nadeemzafar9518]

what is the specific code for def pump faulty

[@bustedknucklebydieseldr3228]

Those two codes will have you replace the pump but as for one main code def pump faulty. Not sure, I would have to come across it again. Usually the troubleshooting just wants filters and pressure reliefs replaced for most def pump codes.

[@jeancadet5862]

What was the cause of failure

[@bustedknucklebydieseldr3228]

There are many causes of failure for these pumps this one in particular. Was someone did a filter replacement and installed it incorrectly and it prematurely failed.

[@01pistache]

What's the price for that pump

[@bustedknucklebydieseldr3228]

Those pumps run around $800 and are usually on national backorder as most people need them. That’s when top secret hook up comes in handy.

[@AlexanderBeenGreat]

ADF priming? What is that?

[@bustedknucklebydieseldr3228]

Adf is a company that makes diesel parts for these trucks. I think you mean ADS priming ,which is a routine in diagnostic link that primes your aftertreatment def system. It’s makes it so there no air in the system and filled your pump bladder with def so no issues occurs. It’s also useful to find leaks in the system. Hope that helps.

[@TeooTheFeoo]

@@bustedknucklebydieseldr3228can you do this through JPRO

[@bustedknucklebydieseldr3228]

@ great question. Never use it so I’m really not sure

[@fishinwithcee3294]

I have that code but with fmi 6 it say high pump current?any idea

[@moonrunnerlife1640]

There is an updated valve on new pump I yhink? Mine uses alot of def now. 👎

[@TheFaze732]

Do you have to drain the coolant? Thanks

[@bustedknucklebydieseldr3228]

Thanks for reaching out man. Three options with the coolant. 1. Drain the coolant. 2. Put cooling system under a vacuum. 3. Pinch off the coolant lines by battery box going towards def header/def pump. Any one of those will work depending on the tooling you have. Hope that helps.

[@glackaglack1534]

What year is thT that truck ?

[@bustedknucklebydieseldr3228]

Trying to remember I believe it’s a 2018.

[@1800fedup]

How much is this job

[@bustedknucklebydieseldr3228]

Parts around 600. Labor would be around 4 hrs of whatever the door rate is. But that’s only replacing, no diag.

[@trustinthelord2248]

How do u prime the system

[@bustedknucklebydieseldr3228]

Great question. The best way is to use regulated air and fill the bladder like I did than run a def priming routine through a computer. If your doing this and don’t have a computer than next practice is to fill the bladder with air and than try and do a regen. It should push and bubbles out the def doser. Hope that helps.

[@naqibullahkhidri2948]

Hey sir do have idea about this code freightliner cascadia 2016 code 5246fmi15 5246fmi16 5246fmi0 3216fmi13

[@bustedknucklebydieseldr3228]

Yes I do and glad you asked. Usually this code comes up with another code. A main issue code. These three are just info saying there’s an issue that’s being ignored. If there’s no other code present than a regen or scr efficiency test will be required to find the main cause. I’d get it looked at quick as these will derate you down to 5 mph.

[@clarencerainey5072]

Anyone experienced Def light blinks red when you turn the ignition and won't start

[@bustedknucklebydieseldr3228]

You would have a def related fault code that would need to be addressed

[@tatiannaarce]

Or perform a Manuel parked regen before doing the regen make sure cruise control is off that can sometime hinder the process

[@2mbili449]

Where your shop at

[@bustedknucklebydieseldr3228]

Thanks for watching man. I dont have my own shop yet. Hopefully in the near future. But help me out and subscribe,and send these videos around and hopefully that can happen sooner.

[@victorreinoso330]

Very good video my friend One question What happens if you don't Blow air in the pump Like You did

[@bustedknucklebydieseldr3228]

@@victorreinoso330 thanks for reaching out man. If you didn’t blow air into the pump than it may not become inflated correctly and not have along life or def passing through it issues. Hope that helps

[@glackaglack1534]

Man where are you?? A

[@martinortiz4547]

What happens if the pump is not inflated with air?

[@bustedknucklebydieseldr3228]

Good question. The bladder doesn’t get filled properly and won’t have a full life span. So it comes down to not running at its best and pre mature failure of the def pump.

[@debo45dr]

Can you go back and do the bladder if you already put the pump on

[@debo45dr]

And my check engine light still on

[@bustedknucklebydieseldr3228]

Great question and it hasent been asked yet. Yes you can and there a maintenance interval for filling the bladder. I believe it’s every two years. Which I’m sure no one ever does.

[@lionelsalcedo4266]

@@bustedknucklebydieseldr3228 man crazy thanks for the info!! now if I ask my mechanic to inflate the bladder he is going to say I'm crazy

[@peetakang2335]

I change my def pump but light still on

[@bustedknucklebydieseldr3228]

Thanks for reaching out and watching. The light will only go off once the enabling conditions are met or the ada self check is done through a computer. If you don’t have a diagnostic program your going to need one for this one. Hope that helps.

[@peetakang2335]

Now I change my after treatment harness connector 20 pins but the check engine and stop lights and deff low lights on wt i have to do now

[@bustedknucklebydieseldr3228]

@@peetakang2335 I would say in a very professional opinion. Stop replacing parts and listen to your truck. Start with the basics and troubleshoot from there. No point in dumping money when it’s not needed. Plus without a computer you might not get very far.

[@peetakang2335]

@@bustedknucklebydieseldr3228 okay thanks very much for suggesting

[@JS-jv6rg]

What are the symptoms that this pump needs to be changed? Can you just slap that pump on and go about your business, do you really need diagnostics?

[@bustedknucklebydieseldr3228]

The symptoms you’ll have is just a check engine light really , that or you’ll take a look at it and see it leaking from the vents otherwise you’ll never know. You can just put one on but that will not get rid of a cel or derate.

[@VladdevileSw]

I pay dealer 650$ for pump, and 850$ change, 650$ cleen dpf, and wait for this job 1.5 day😢

[@bustedknucklebydieseldr3228]

That’s why these vids come in handy so you can see how quickly things can get done. But I’m sure some of the hold up was waiting on parts or waiting on the estimates or approvals. They tend to keep things held up

[@Malik0325]

I have Code: SPN 4374 FMI 0 SPN 5246 FMI 15 Can you tell me what's the issue when those codes are together?

[@Amir_I]

8 min job and 1500$ cost 😂

[@bustedknucklebydieseldr3228]

This knowledge and those parts are very $$$ huh. That’s the secret

[@Amir_I]

@@bustedknucklebydieseldr3228 def pump 450$ - 480$ 😁

[@1800fedup]

@@Amir_I so at least $1200 I’ll be coming out of