I had to take my truck to my Dmax tech the other day to have the trans reflashed. While I was there I had them go ahead and change the fuel filter. To my surprise He filled the new filter with ATF. Being a former mechanic (gas) I was alittle surprised. He ashured me that it would not hert a thing. He also said that it would actually clean the injectors. He turned the motor over and it fired right up! Not one pump! I still don't fill very comfortable with it though it seams to work very well. So if any of you guys out there ( Eric,ect) have any comments lets here them.

I would look for another mechanic, Wakeboarder. He just did you and your engine a great injustice. Good news is that it was a small dose, bad news is that he's applying "old school" diesel service techniques that will DESTROY your modern $40 truck! ATF was used in the old days on mechanical injection systems and did work "without hurting anything" to lube the pump and clean the injectors. The contents of ATF are NOT good for your high-pressure close-tolerance Bosch system as it contains additives and compounds not meant for combustion and the kinds of pressures in the fuel system. The ATF will leave destructive and strongly adherent carbon residues to the tips and nozzles of your injectors. The detergents and other additives are not a good match for the injection pump and seals. This guy's an idiot and should not be working on a Duramax.http://www.dieselplace.com/forum/smileys/Angry.gif

I was afraid of that! That is why I brought it up because I didn't think it was right.

I've heard of that trick on older, low pressure fuel systems, for cleaning injectors. Hadn't heard of anybody that had the testicular fortitude to try that on the dmax...


Ty

Damn, Tom. You post FAST...


Ty

Good news is: it's okay for pumps, generators, combines, tractors and forklifts


Bad news is: you aint drivin' none of them!http://www.dieselplace.com/forum/smileys/Embarrased.gif


I wouldn't be too worried about this "one shot" that was quickly flushed with following fuel and diluted and recirculated into the rest of your fuel. I WOULD be very worried about letting this Yahoo continue to work on my truck and apply his "tricks of the trade!" Obviously he "don't need no schoolin" on these here Duramaxes, diesels is diesels and he's been wrenchin em for a long time!

You can prefill the OE filter with diesel just as easily, and a lot less $$$.





You do want to be sure that the fuel does NOT fill through the center rubber...

Should we even prefill? I thought about it and and worried of getting dirty fuel past the filter and to the injectors.

I wouldn't, and do not, but like I said, if the pre fill fuel does not enter throuh the grommet it will be filtered prior to leaving the filter.

Lucky youhttp://www.dieselplace.com/forum/smileys/Clap.gif!! I would think that you have been awarded a lifetime warantee on the engine and injectors!! If the process was not defined by GM and the mechanic did something he thaught was right (although wrong) perhaps one could argue if any future problems arise.





Patrick

wake boarder yo have the worlds laziest mechanic, or the worlds stupidest. I didnt pre fill mine and it took 20 pumps or so to prime. I buddy of mine that races trucks dumps atf into his fuel suppy to shoot flames. Of course hes making well over 1000 hp and his truck doesnt have the injectors we have. I dont think it will destroy anything, make sure your record at the dealer shows he did that. Sure make it easier when something does happen. no telling what that strong a dossage would do. For a moment you were running straight ATF and im sure your injectors, manifolds, and maybe even turbo knew it.

The foregone comments re 'old school' reminds me back when I was tech mgr for USAF yellow iron - I would listen to the ol' geezers next ofc over that managed the diesel ground power systems advz blue suiters that were low on diesel availability to mix a prescribed ratio of crankcase oil w/mogas as a substitute. Equipment must have been more forgiving back then.

I remember when my father did what he called a "poor mans overhaul" He would remove the aircleaner and raise the throttle to about 3 thousand RPM. He would then proceed to poor tranny fluid down the carburator. I have no data to prove the effectivness of this treatment but I do no there was not a living mosquito in a 3 block radius!


OLD SCHOOL!Edited by: Bronco