http://www.dieselplace.com/forum/smileys/Evil Smile.gifThough I'd heard all there could be for reasons for injector failing, but in talking to my GMC service manager about pre or post position placement of secondary filter, he admitted they are having a LOT of injector failures on all 01, 02, and 03 DA recently and said GM has issued a bulletin and instructed the dealers that the cause is a Fed mandated change in diesel fuel content last November reducing sulfur content for lubrication and adding a silica lubricant which is sandblasting the injector orfices. He says the GM recommendation is to change fuel filters every 6,000 miles, which I do anyway. Anyone else heard of this reason for injection failure?


Secondly, upon hearing of my falling mpg (average 16 to average 13 to 14), he also advised of a new wash procedure where the dealer, for a meager $150 or so, washes out or cleans the fuel delivery system under pressure eliminating contamination buildup and bringing back original mpg. Says GM now recommends this every 30,000 miles or so on diesels and has been doing it on gas rigs for years. I've owned over 20 GM diesels since 1982 and have never heard of this. Comments from those in the know as to whether this is fact or more GM or dealer hogwash to make an extra buck. I think this service manager really believes this (honest guy, honest dealership selling and servicing lots of D/A), but not sure I trust Uncle Jimmy. Thanks.

First we get a TSB that states there are known parts inside the injector that fail, and know we get the info. that silica is in the fuel. There is not an air filter or fuel filter in the world that will protect a guy from both of these statments.

Hey, after you get your fuel system washed out, I have a bridge for salehttp://www.dieselplace.com/forum/smileys/Ermm.gif


Curious as to what he is doing and how he is doing it. Please ask him and report back for us inquiring minds

does that bridge connect to the swamp land in the desert?http://www.dieselplace.com/forum/smileys/Clown.gif

http://www.dieselplace.com/forum/smileys/Evil Smile.gif...he admitted they are having a LOT of injector failures on all 01, 02, and 03 DA recently and said GM has issued a bulletin and instructed the dealers that the cause is a Fed mandated change in diesel fuel content last November reducing sulfur content for lubrication and adding a silica lubricant which is sandblasting the injector orfices....

So does this mean that the federal gov't will pay to have the injectors changed? (LOL - Yeah right) Or is it Bosch's fault for not building a good enough injector?

Does this mean that Premium Desiel is bad for our injectors?

While being a lubricant for the engine, the silica is an abrasive for the injectors. That doesn't seem logical. Please clarify.

Is silica analyzed in fuel analysis? If so, I would think someone like George would know if/when the silica levels increased (assuming they did) around last November.

If GM reccomends changing the fuel filter every 6000 miles now instead of the 15000-20000 miles, are they covering the extra cost and time involved is this added maintanace? I didn`t think so!


I talked to an GM Technician a while back about my secondary 2 micon fuel filter. He informed me that GM could and probably would refuse any warranty work that involves the fuel system. The reason was that I was filtering my fuel down to much. So from what he told me, the fuel can be to clean!http://www.dieselplace.com/forum/smileys/Big Smile.gif


What I want to know; What is the happy medium where the fuel is perfect?http://www.dieselplace.com/forum/smileys/Approve.gif

A little followup to the injection system cleanout. According to the dealer's service manager upon repeat questioning, the cleanout is of the entire FI system and pump whereby they somehow attach to the rail system, pressure induce a GM approved cleaning agent/fuel mix and run the vehicle engine for about 20 minutes solely on it, purging the entire system of all contaminents in the lines, injection pump, and injectors. Sytem is new for the D/A and is made by B.G Chemical and approved and "recommended" by GM. Supposed to take your falling MPG back to original MPG received when truck was fairly new. They have had the system for about a month, and have done 5 or so trucks, with supposedly all the owners claiming mileage increases. I asked for the name of one of the owners, called him, and he claims his truck was getting about 13 mpg (50,000 mpg - 2002) and after the procedure he went back to close to 17 - 18 mph he got when the truck had about 10,000 miles on it. Says it has been fairly consistent for about 1,000 miles. Idea is similar to additives, but directly injected, sole means of combustion, and is good for about 50,000 miles or so. So, techs, comments please.


Eric - about that bridge. I'll take it on the following terms: No money down, no interest for 10 years, no payments for 10 years, you and the State of Arnold maintain it for the 10 year test period, you and the State of Arnold guarantee me the sole right to collect tolls for the 10 year period at whatever rate I so choose. In exchange, I will grant you and King Arnold a personal license to travel over it free of charge for the first year which you motor from San Francisco to Mill Valley. Such a deal!

That's funny. I was reading about that BG machine from BG's website when I was looking at their fuel treatments a couple of months ago.
More info on the machine is at:
http://www.bgprod.com/bgprofessional/bgproducts/dieselfleet.html Edited by: 4x4man

OK - now we know it exists. Does anyone have any experience with it? Techs - is it theoretically sound or is Eric going to want to sell me a new gas cap that will cause me to get 2,000 mpg to go along with the bridge he's selling me?

They have been cleaning gas injectors for a long time. The problem is you run strong solvent through your motor which could brake loose large chunks and end up scratching or plugging. Sometimes this is your only option.


I prefer to run an injector additive from the get go. This is a more gentle cleaning method.


Did anyone catch the comment by HDMAX that we may be getting our fuel to clean? I don't beleive it, but if that were true, that would shoot alot of holes in alot of theroies?

BG demonstrated the Diesel injector flush machine yesterday at my shop.But I was not able to stick around watch it.Parts manager had his truck done I will ask if it changed anything on Monday.