2011-2016 LML 6.6 Duramax Cp4 injectors fuel rails and line replacement

We replace the notorious CP4 pump, all 8 injectors, fuel rails and lines on a 6.6 LML.
DISCLAIMER
Automedic Garage does not own nor claim the rights to any songs in this or other videos. This video is intended for informational and entertainment purposes. Always follow manufacturer and professional practices/advice when performing maintenance and modifications to any vehicle. Automedic Garage is not responsible for any damages or injuries incurred from attempting work portrayed in this video.
Composer Name: ​WAVETOYS Song:INNER FIRE IPI number: ​00861760815
Music from KZbin Audio Library [Aka YAL]
Music provided by RFM: • Video ​
Musictoday80:
/ ​
/ musictoday80​
/ ​
kzbin.info/door/xsF...
Music from Soundcloud
Music provided by RFM: • Video ​
Music from KZbin Audio Library [Aka YAL]
Music provided by RFM: • Video ​
Music from KZbin Audio Library [Aka YAL]
Music provided by RFM: • Video

[@rcjunkies816]

Great video💯💯💯💯💯

[@tonywahs]

No thank you anyway I watched your video and actually found it thanks again awesome video!!!

[@user-zl3ig5uh2o]

You did a good job when that pump goes down you half replace everything

[@michaelmcmillan4263]

Yea,my 16 lol is currently in line for this. But having the cp3 going back in it

[@jqshirley14]

Very well explained video!! Thank you.

[@AutomedicGarage]

Wasn’t my best video, and I’m not a duramax mechanic but I tried.

[@asuntris2060]

Good video Help us Thks

[@brandontheruler9458]

I know very little I did my thermostat on my 2011 lml and that was a sort of scary project for me. From what I hear the cp4s are doomed to fail, not if but when. The best route is to do a cp3 conversation. That's number one on my list (when I can afford it) wish I had the stones to do it myself. Awesome video man , although it may give me a false sense of my abilities watching how easy you make it look 👍👍

[@AutomedicGarage]

Thanks for watching.

[@oldblue101rf]

It was intimidating at first it just takes time. To disassemble and remember where bolts and wiring snaps back together. Other than that this video gives you the basics. There are no tuning required kits now so drop in cp3 without recalibration and no timing of the pump. Great video and good job.

[@tommyschulte2577]

@@oldblue101rf if I understand what you said. You can just put the cp3 in without lining up the dots? And no recalibration? Is that right? Just curious. I think I want to convert mine over... right now I have an lml with cp4 200,000 miles.

[@marioguerrero3607]

If my CP4 On my 2016 failed what would I need to do to fix it and get it running again the dealership is quoting 10,000

[@Mantijohnson]

Does it matter what injector goes to what cylinder as long as you keep track of the numbers

[@haydendenard2693]

Pro tip you can get that bolt behind the water line without pulling powersteering bracket you just use a swivel ratchet wrench

[@AutomedicGarage]

Thanks, I’m obviously not a dmax/GM guy, he begged me to do the job cause I work on his powerstrokes. Thanks for watching.

[@travis_2622]

What about contamination in the gas tank, supply lines, return lines, and filter housing? Were they flushed?

[@AutomedicGarage]

Yes, I dropped tank and back flushed lines with diesel using a small electric fuel pump off camera.

[@michaelwatson5553]

Hey man. Great video. Just what I’ve been looking for! I’ve got a 15 LML. I’m about to try this install with a CP3. What do I need to be able to program the injectors to the computer?

[@michaelwatson5553]

Also, any other pro tips would be appreciated. Lol

[@AutomedicGarage]

I use autoenginuity for all my bidirectional scanning needs. Under “special functions” there’s a drop down for injector programming and I just enter in the numbers on the tops of each injector. The thing to remember is you have to know what each one in for each cylinder number to program correctly.

[@freetoride003]

also i did the same job with new 3" down pipe and up pipe upgrade and a cp3 conversion and added a lift pump. the cp4 will fail and there is no fix for its failure. you can add a lift pump and extend its life span but tha'ts about it.

[@AutomedicGarage]

I agree but customer wanted to go back with cp4

[@rcjunkies816]

I have a 2015 Chevy Silverado Duramax LML my CP4 went out Being your visual you stated you were going to replace rails and lines I was wondering aren’t you able to just flush out the lines and the rails what’s the reason we need to replace those parts

[@AutomedicGarage]

For 1 they come as a kit and with the cp4, rails, return, supply lines and injectors. You could try flushing, if flushed correctly it would achieve the same results, however I don’t want to risk any contamination nor want a return job. Thanks for watching.

[@mikew441]

It's like sand blasting. You can do a great job but sand will always be somewhere in any complicated part. ANY metal debris will wipe out the system again.

[@tonywahs]

Good evening I just got done replacing the fuel injection pump and I had a line that I really don't remember can you please help?

[@AutomedicGarage]

Man not sure I can help like the video says this is t a job I do regularly. I’m a Ford and Powerstroke mechanic don’t mess with these much other than routine maintenance.

[@boscos5287]

How can I tell if metal made it to the high pressure side?

[@AutomedicGarage]

If there’s metal in your FCA it’s in the whole system

[@rcjunkies816]

I have a 2015 Chevy Silverado Duramax LML my CP4 went out Is there a reason to replacing the lines and the rails can’t you just flush them out

[@chrismathewsmerriman2144]

Everyone claims you’re supposed to replace everything

[@timw8228]

@@chrismathewsmerriman2144 I never understood that myself. Why can't they just be flushed out. Maybe the time and expense flushing costs about the same as replacing. Seems like someone could make a finer fuel filter also to stop anything from the tank going past the filter and stop the nonsense of changing fuel lines and cleaning the tank.

[@jimendicott1192]

How did you get the fuel rail crossover line out from under the turbo?

[@ivangutierrez7812]

Got an update? I just flushed it and gonna send it. Almost done putting it back together

[@deboss8420]

​@@ivangutierrez7812did it work?

[@ivangutierrez7812]

@@deboss8420 flushing it worked. Dont skip dropping the tank and cleaning it. Thats where majority of the debris will be

[@Dirtycrafts]

@@ivangutierrez7812 Bro, what did you clean it out with and how? I’m stuck on this part right now and almost started taking the turbo off.

[@jeffbykowski5467]

How many total hours labor did you have in it including programing and oil change? Minus video time.

[@AutomedicGarage]

Around 12

[@freetoride003]

no tools needed to remove the injectors. give them a slight twist and then twist back and forth with a light pull at the same time they will come right out. if you end up having to reuse you don't ruin the orings

[@AutomedicGarage]

I didn’t use a tool. I was stating “they make a tool”

[@rcjunkies816]

Was the reason to replace the rails and lines Couldn’t they just be flushed out

[@charlesc5983]

Why didn’t you do the cp3 conversion. That way you don’t have to worry about the cp4 time bomb

[@AutomedicGarage]

I did what the customer wanted. I couldn’t convince him to do the cp3. Is what it is I got paid either way.

[@timw8228]

@@AutomedicGarage Customer must have money to burn. No way was a CP4 going back into my LML. Fortuneatly the shop had just put in an Exergy fuel meter and it was idling and the CP4 failed. They didn't see any reaason to replace all the lines and injectors. I gave them a CP3 conversion kit gift. Now I'll set and wait to see what happens on the class action lawsuit against GM. Now they owe me!

[@AutomedicGarage]

@@timw8228 wasn’t my call, customer showed up with box full of new parts and a truck he wanted fixed. I mentioned the cp3 but he was persistent on doing the cp4. His money not mine.

[@timw8228]

@@AutomedicGarage Yip I understand. After I saw some replacement cost even the shop I use told me an ambulance they did was $14,500. I said oh he11 no I don't want that. Like I told someone else. You can pour all the lube in the tank. That is a flagrant design flaw in the CP4.that no lube is going to correct. You're just gambling.

[@timw8228]

Plus I know I wouldn't even touch a used LML if I was looking to buy one that wasn't converted. It's a plus if I wanted to sell mine.

[@TopG82]

How much mechanic shops charge to get this done ?

[@AutomedicGarage]

The parts alone in the video was almost 4K plus what I didn’t show was dropping the tank and flushing the fuel lines. Prices vary but generally parts and labor are between 8-10k

[@Webedunn]

You don’t have to time the CP3 pump like the CP4.

[@AutomedicGarage]

Did I hurt anything doing it? Nope

[@Webedunn]

@@AutomedicGarage Just thought I’d give you a heads up but I won’t do that anymore. Don’t wanna hurt no feelwinz and wind up, CANCELED!

[@AutomedicGarage]

@@Webedunn no cancelling here, we ain’t woke. I’m not a GM/duramax mechanic, I mainly do all Fords/powerstrokes and Cummins. Customer had a duramax which I usually only work on his Powerstrokes and he really wanted only me to do it. Thanks for watching.

[@Webedunn]

@@AutomedicGarage fair enough.

[@Webedunn]

@@AutomedicGarage I meant no disrespect champ, I just figured I’d give you heads up in case you do another CP3 and it may save you time. I’m not a Mechanic but I’m doing a CP3 on my Duramax right now and watched S&S video from a Duramax high performance shop. I actually find your video very informative. I’m a commercial/industrial Electrician so I’m not to smart to begin with. Again man, I wasn’t being condescending towards you, just helping others out. That’s our mission in this realm.

[@michaelmcmillan4263]

All that $$$$ wasted if he doesn’t install a lift pump

[@kilianculver9263]

You can save a lot of money just not buying a duramax