LB7 DURAMAX INJECTOR RETURN LEAKS!!

[@craftybynature3760]

I love this channel .. your naturally calm approach to things amaze me.. you are clearly a smart and clever man and it shows in your videos. I wish you were my mechanic.

[@2005llyduramax]

That computed is the Ficm, not the Ecm. If you follow the duramax repair manual, the valve cover bolts tighten alot, if you don't have the Haynes duramax repair manual yet, you might want to get one. They are very handy and have most of the torque specs your gonna need. And most of the dirt that plugs up the supply side of the injectors is believed to get in there when you loosen the feed lines from the fuel injector, cause alot of dirt finds it's into the gap between the fuel feed line and the line nut, so when you loosen the nut the dirt falls into the injector. That's the theory anyway.

[@stevewaclo167]

Wow! For a guy who has never battled an LB7, you did a remarkable job👍. Just did my CA/LB7/EGR injectors last summer and frankly, I'm amazed everything worked out for you. As someone pointed out below, that crud you saw on top of the injectors was from removal of the HP lines. Most folks going into these engines don't worry about it, since they will likely be doing an injector R&R anyway. As you know, the big kids at Bosch disassemble injectors in clean rooms while they are wearing bunny suits. It's not for nothing the fuel filter pulls out particles sub-10 (+/-) microns and I've never heard of someone using diesel fuel and an air gun to clean crud off the top of the injector HP fitting. 😱 Also, you didn't mention replacing (or cleaning) the HP lines from the common rail. As I said, that's where all that crud on top of injectors comes from and without proper equipment, they are difficult if not impossible to clean. For a couple hundred $$$, they should be replaced. You will notice the top of those HP fittings on the injectors are open to atmosphere and water gets in and corrodes them. Most folks silicone around the open part of the fitting, which goes a long way toward eliminating corrosion and allowing reuse. Again, I won't argue with results (well done!) but you did break a couple of well established rules regarding cleaning injectors and reusing (I presume) the HP lines. Also, don't prefill the fuel filter. Any debris getting in on the output side (past filtration) is bad news. Put it on empty and pump the primer...and pump...and pump...and...😀. So, I'm writing in November/2018. How's that beast (that the owner got for cheap) running? Best.

[@orlando2128]

Hey man, I know this isn’t a flatbed build video. But I just wanted to let you know that you inspired me to make a little flatbed for my ford ranger! I’m about 50% done welding it. Keep up the great work! Cheers from Florida!

[@Cumminslife]

Sick man, send over some pics!

[@chriswarren5814]

Thanks again buddy for quick turn around on the duramax

[@MantisGarageB]

how did you get the truck so cheap? was it cuz it was broken?

[@chriswarren5814]

Mantis Garage yes. Shop quote was 7300$ to replace injectors. So the lady didn’t want it no more

[@TheOffroadJoe]

7300 for injectors? At over 5k in labor on an engine that is much easier than a like year ford 6.0.....no wonder she let the truck go... should have shopped around...the quote was waaaay overpriced sadly....

[@stevewaclo167]

TheOffroadJoe That’s he kind of estimate you get when they don’t want to touch the truck. 😀

[@otisspunkmeyer2010]

@@chriswarren5814 wait so you got the truck for $250 bucks

[@Fourandaquarter]

I saw this video and immediately thought, why don't people take apart and clean the damn injectors? Everyone always chooses to condemn the works and then spend a pile of money. I think the case could be made to at least take them apart, clean and reassemble. Especially if it's an older truck and well beyond warranty. I'm willing to guess a lot of injectors are discarded just because. Nice to see someone actually fix something old school. Nice video! 👍

[@chevypolice]

Great video and very informative. Just wish everyone on the duramax forums didn't push on just replacing injectors and buying from there company. There expensive and not always the cause. I had the same issue as this guy. Figured it out with uv dye and a black light.

[@fixingstuff1253]

I don’t understand why you don’t have a lot more subscribers I found your channel through pugs I think you’re videos are good keep up the good work

[@wilhelmsteinert4733]

Today we got almost 2 ft of snow in Northeast USA. I spent the whole day plowing just listening to you talk and occasionally glancing down at my phone to see what you were up to. Keep the videos coming

[@KooshdaakaaGarage]

Stellar job man!!! These injectors are the cause of much anxiety for LB7 owners and ya made it look easy! Thanks for the LB7 content 😀🤘

[@2dogsmowing]

Hey, check out who is here (it may be 3y ago) but still cool to see. 😉

[@chasebecker6054]

The rusty lines do that to the injector, replace the lines always replace the lines.. then silicone over the holes in the lines so water doesn't get in and it wont rust next time

[@Taylordrifts]

The only reason I got rid of my duramax was because I didn't want to have to work on it. lol It was such a good truck though

[@2dogsmowing]

Easyouts are your best friend when removing valve cover bolts.

[@kbc04920]

The mess in the Injector is from the injection lines when you remove them. It’s all the rust and crap from the threads when you take them off.

[@expro2039]

Was just guna comment this

[@adanvaldcontreras4283]

Great job 🤘 But I'll stick with my 12v.Cummins.

[@vrock265]

Dude: You are a real inspiration. I would look at that rats nest of an engine and say F that and walk away. Unless of course I got a SUPER good deal on the truck. But still you approach stuff like nothing is a big deal. I guess as you get older more things become a PITA...LOL...Good job, hope the owner paid you well. I am guessing the stealership would have ripped him off for 5 or $6k US ?

[@randydunning6729]

use that motor oil mixed with diesel for a fire starter works great

[@skylerhouston]

put it in a 1st gen cummins fuel tank!!

[@24svern]

Just one thing to add my hp lines were seriously corroded, soaked them in white viniger and hydrogen peroxide and cleaned them with a green scouring pads.and blew them out with break part cleaner.

[@24svern]

Watched your video, just finished doing my injectors on my 04 lb7. It was a lot of work. your video was very helpful and informative.made doing the job easier. Thank you.

[@tommyhalcomb7136]

How many miles on your 04 before they failed?

[@Bearcats737]

defiantly put me off doing a duramax swap on my ol 85 gmc, 6v53 it is, one day. also if those bolts are sunk into aluminum, the steel bolt will cease to the aluminum, just take a hammer and punch and give it a good whack on the head of the bolt and they will screw right out.

[@Cumminslife]

Thanks for the tip I'll give it a go

[@skylerhouston]

then give 'em a little anti seize goin back in with em

[@jaimecornejo2185]

@@Cumminslife so I did the same test with my air nozzle but what ended up happening was that it blew back at me. I mean when I removed the air nozzle from diesel line it just blew back like I pressurized it and it didn’t have anywhere to go. Did that happen to you???

[@Sembrandolasemilla777]

Best video I’ve watched regarding duramax injectors. Thanks 🙏

[@Lucas-vk8fz]

geez you do well to tear into a job like that and figure that all out like you did...you made it look easy and for most of us yahoos, I know for a fact.. that this wouldn't be an easy job..there'd be alot of cursing and skinned knuckles..lol thanks for sharing

[@Wayne-dh2du]

Why dont any one show how to test for fuel return line leaks ?

[@JasonTheMunicipalMechanic]

Chevy says balance rates should be within +/- 4

[@colbyc.6698]

Look at the fram filter no wonder the injectors are stopped up

[@jesusrico2347]

thanks for your video I have the same issue on my truck . I like the way you attack the job

[@apuckett1971]

Thanks for the video. I installed new injectors in my lb7. It started leaking diesel into my oil I tried everything to figure out where it was leaking. I tried your air test at 20 psi found a leak on one banjo bolt. I tried new banjo bolt gasket new with new banjo bolt still leaked with air test replaced new injector with another new injector used same banjo bolt and gasket no leak. Happy I found your video to troubleshoot leaking injectors and return lines. Sucks it took me a week to finish my injector replacement because I received a bad injector.

[@Cumminslife]

Sweet man glad I could help!

[@artcook1976]

Good info I hv duramax and when I change fuel filter ,I opened bleed valve and bump starter for sec couple times ,till little diesel come out then I hand pump a couple times till all air bubbles gone 😅😄😜😉

[@LB7reese]

If only a Cummins was in the Chevy

[@offroadcanadian552]

true, I would buy a dodge if it wasn't for their transmissions being so shit.

[@darthvators007]

The manual trans in the dodge is sturdy enough. But I would never purchase the autos

[@stevewaclo167]

My admiration for you attacking this LB7 👍👍👍. My CA version had an EGR cooler on the passenger side and added to the festivities. How is the truck running after 18 months? Injector tear down in a shop, no matter how carefully done is going to allow invisible particles into the system that will ultimately spell doom. 😩

[@okiedoke6373]

Yeah I just bought one of them leaky injector SOB from the henna Chevrolet in Austin Texas I gave top dollar for the truck just to do a ten-thousand-dollar repair

[@ricardorodriguez-se7tp]

Its dirt when your removing the fuel line it drops dirt down when your pulling off the line off the valve cover. how much in labor did you charge him.

[@1mw4tch1ng]

if got the truck same price of one injector then he got a good deal on the trunk. Skipping on others may have to do the same work twice it still leaks or lack of power.

[@DDescalchuk57]

Ecm is beside the tcm which is by the fan shroud lol that’s a ficm

[@meade4573]

The LB7s had this problem, I got a 05 lly with 300k no issues.

[@EntertainmentHub69]

Cogneeter every truck has it's issues. The lly had head gasket issues. Lb7 was injectors. Once you replace the factory injectors they last a lot longer. But it all comes down to how you take care of your truck. Except the Ford guy with there 6.0, 6.4, and 6.7. You have to drop a ton a money in to them to get them working right and even then they still have problem.lol

[@stevewaclo167]

Everything after the LB7 used SAC vs VCO injectors. (Look up those two types to learn more). I'm confident that made all the difference. Short version: better pintle seal and no dribbling to coke the nozzle, mess up the spray pattern and produce the dreaded stinky smoke at idle...

[@GregoryJohnston77]

WE MISS YOU DUDE, COME BACK TO KZbin. 😂😂😂

[@hddm3]

That dirt if from the line when you take it off

[@mjt-ew8rs]

no it is not. why would there be that much dirt under the valve cover only on the injector?

[@stevewaclo167]

m.j t ummm, yes it is. The top fitting on the injector is open to atmosphere and water accumulates, causing rust which falls into the injector screen upon disconnect. Why some appear clean is a mystery. Those injectors are all toast.

[@travisnighbert9566]

Yup, Everytime. That's why you replace the injection lines as well.

[@steves9955]

@@mjt-ew8rs youre an idiot

[@jsnmart97]

and that why we drive cummins !! .. nice work !

[@white24valve]

On the high pressure fuel line that threads on to the injector thru the valve cover,silicone it tonkeep moisture and dirt/debris out. Did you happen to run the valves while you were in it that far?!

[@butchcassidy5398]

It's An LB7 what do you expect a good metal? My LML 360,000 us miles still ticking...........

[@butchcassidy5398]

No spots in floor yet

[@OrionsKelt]

Any problem on lb7 injection systems is usually chocked up to “its normal”

[@Knivesandstuff4]

All that dirt on the injectors is from the injectors lines

[@BrowerBandit]

see here is the think, this is a LB7 the first common rail engine placed in a pickup truck, so yes nothing makes scene you get the next motor a LLY and everything is simple.

[@pizzapussysanta9502]

First common rail? ...... OK buddy! Look up hino, Mercedes, alfa Romeo. Step off your DURAMAX bandwagon and join the rest of society.

[@EntertainmentHub69]

Most of the time when you take the injection lines off crap falls down in to the port.

[@matthewrisner3736]

Thnks this was also going on with my duramax I believe u have me on right track

[@mjt-ew8rs]

hey, it is possible the dirt you are seeing is actually combustion gases/oil coming back up and through the injector. it does happen

[@joekoltuniak4555]

Like your video , very informative. I would like to know what software or scanner your using to check balances and fuel pressure rate. Thanks

[@Turbotalkin]

8:40 theres the problem Fram filter 😂😂

[@stickyurbex3333]

Good shit I been waiting for this video for awhile thanks 🔥

[@Dylan_LB7]

That’s the ficm that has fuel going to it

[@misconceptionindustries2968]

Wat a nightmare! I'll keep my 5.9!

[@Tootallfordoorways]

What are the type lines next to each other on back of the engine, they're braided into metal lines.

[@chrisao1987]

1 injector costs about $350 so he paid less than $350 for the truck? What a deal...

[@briancormier5236]

Well done very good video here!!! Right on point love it thank you very much appreciated

[@angelzams]

Ones u get diesel in oil pressure is low on dash

[@blainelorntsen2370]

When I blow air into return line I get no fuel comming out where the lines goto the injectors I took the metal lines right off and still no fuel fuel filters new

[@luxstar4life]

Neglected filter changes?

[@IndiansAuto]

Nice rig!

[@lml6.653]

Fuel goes through the ecu?...... Right.....

[@edgarralda5156]

Great video !

[@crustybynatureboyyy5401]

Nice job bro!

[@chasebecker6054]

wow, sweet dodge! That bed is bad ass!

[@Banjoandguns]

You seem like a good dude. Thanks

[@joshgreene3329]

I know this was a video from awhile ago but did this work and owner not have any more issues?

[@brojamessistertrise5289]

Where are you located? If you’re not too far from me I’d like you tow my truck to you to get it checked out.

[@GregoryJohnston77]

These lb7's are plagued with injector issues. The #1 issue is injector cups.

[@stickyurbex3333]

What did you torque the return lines to?

[@fuel8893]

Is hard work I replaced the cp3 before

[@jamesl5010]

Nice video!! What you charge me to do the same thing to my '06' Duramax

[@randypeters6964]

Yes great video . Hard to find honest mechanics like you. . You got any references in Seattle Washington?

[@randypeters6964]

I had my 2003 Silverado 6.6 for eight years no problems i just did regular maintenance oil changes lots of power i tow 27 ft 5wheel no problem. I need a good macanics to do what you just did.

[@tunas66]

great video

[@unapologeticallypatriotic3853]

Paid less for the truck than 1 replacement injector?

[@unapologeticallypatriotic3853]

I need a deal like that.

[@bradjohnson6783]

How much did you charge the customer ? I have the same issues and trying to get an estimate. Thanks.

[@SINISTER69er]

wow I love that it took a cummins guy to figure out an awesome idea to a duramax guy, use the fuel line as a handle and pull out the injector easier lol

[@ridebmxalaska]

that's the ficm not ecu

[@lochlanm8684]

That isn’t the ecu on the motor it’s the fuel injection control module that’s why it has fuel flowing through it 😂😂 not the ecu

[@trevorwarthman4296]

That’s not a ecu that’s a ficm

[@frankysnake635]

if only he knew where all that dirt in the injector came from.......I bet most of not all of it was not there before the work was started.

[@Fourandaquarter]

I'd guess it was a function of poor maintenance.

[@white24valve]

Thats called FICM

[@jacobmiller4451]

Isuzu motor..deere runs then to. Some love them some hate them. I'd rather run Cummins.

[@ajaxracing]

200$ lbz? I'll take 10 at that price haha

[@melvinjames9647]

Ajax Racing I'm having a Problem with a Leak of Diesel fuel coming from the upper Right side of my motor on my 2002 GMC 6.6 Duramax Diesel it only has 106,k miles on it never been under hard work

[@melvinjames9647]

I need someone to Fix it

[@stevewaclo167]

Melvin james, you posted just a month ago and maybe fixed the fuel leak by now. Visible leaks outside the engine (duh, where else would they be visible?) on the right side often indicates issues with the fuel filter head, not an uncommon problem on LB7's. The CP3 (combination high pressure and supply fuel pump) creates a vacuum to pull fuel to the filter head, then through the Fuel Injection Control Module (FICM) and on to the CP3 where it becomes pressurized before going to the fuel rails. Sometimes the fuel filter head can be fixed with a rebuild kit but I replaced mine with a new filter head for an LLY. ($600 vs $120). Fuel line routing is different tho and can be fiddly but savings make it worthwhile. If you are also having long crank time starts, that's a clue the FFH is damaged. Again, because the fuel system is depressurized from the tank to the CP3, I can't think of any other places on the right side to get a leak. Duramax Forum is an excellent resource! Best.

[@workinprogress6726]

Fuck the lb7. Love chevy for their gassers but not diesel. I work on all my own shit. And with a dmax you be workin on that shit for days. Cummins all the way.

[@jonboggs3104]

Fram fuel filter? Throw that fucker far.

[@Chevyfan-tl2kw]

No way 300 bucks for that truck get outta here. Perfect reason to buy new injectors then. I did this job it was a bitch but got lucky went good the first time. Lincoln dieselspecialist.com 30%ovrer injectors

[@Chevyfan-tl2kw]

Good vid tho 👌

[@rayforddouglas5215]

76

[@vaccumme]

Young Man. Please STOP ! You did an outstanding job. Do not "Tune the shit out of this thing" The Truck is running well. If you tune it, I guarantee that it will break ! " You have to pay to play" V.

[@Cumminslife]

No risk no reward buddy

[@vaccumme]

Buddy ? I'm old enough to be your Grandfather. I would never address you with a derogatory moniker. I made a comment for the good of the Vehicle and the owner. In the future I will be an observer only. The best to you and your affairs. Ted.

[@Cumminslife]

Since when was calling someone your buddy a derogatory statement?