Hello, I am new here but hope someone can help. My truck is stuck here in Houston due to the hurricane and I am missing work daily where I was employed in Duncan Oklahoma.
It is a 2002 Duramax, bone stock, no chip.the 6.6 will crank up if I bleed the filter, turn key off and on 3-4 times, then crank for 45 seconds it will grab hold and run. It will start a couple times after that but overnight it leaks down so much I have to fill the bleeder screw up a couple ounces, then prime again. I replaced the filter, it only had 2000 miles on it but started with the easiest. I then bought a new bleeder and O ring (18 bucks from GM) still no luck. No fuel on the ground while running or sitting. I borrowed a Matco Determinator code reader from a friend and it shows last code as "Fuel rail pressure low on power enrichment" It shows no current codes, this is a past code. When running the datastream on the Matco shows fuel pressure around 6000 which is what it says is ok. Not sure about all this, have heard it was a pressure valve, the injectors, the O rings on the injectors, fuel filter bracket/primer. Really lost here, can anyone please help?
Thanks in advance
Ron jennings
RJ18181A@aol.com  

Ron,
This sounds like we are having pretty close to the same issues. The only difference that mine starts great when cold, but as soon as it warms up, and you go to restart, it takes long cranking to get going. Have had it into the dealer now several times, but no luck. To me it seems that there should be a checkvalve that holds the pressure in the manifold when the unit is stopped. If we are loosing pressure in the manifold and have to crank to build that up again on each startup, either the checkvalve  is faulty, or we have injector leakdown. I would think that if we have enough injector leakdown to reduce that common rail pressure that much for long cranking, that there should be considerable fuel dilution in the engine oil.
I have the truck at the dealer again now, so will record your email address, and follow up with ya once I see what comes of this.
Don
root@yahoo.com  

HEY RON, The early DURAMAX are known to have faulty injectors !!! I think CHEVY will give your injectors a 200,000 mile warranty.  

Hey Ron,
Following up here with ya. I took my truck to the dealer last wed,to see if they could come up with something on this long cranking issue. Well, they are telling me that # 8 injector is leaking down, thus loosing the prime in the system, and the resulting long cranking to build it up before starting. They are also telling me it wont be warranty, because the injector takes longer to bleed down than they are allowing to condem it under warranty. Also saying there is rust in both fuel rails,and in the injectors. Added grounds not to warranty it. Recommending that they clean the entire system and repalce all injectors. That is fine for them to say when they hand me the bill for around $4,000. A little hard to swallow. On the other side of the coin, one cant have a vehicle that you are not sure when it wont start,and leave you stranded, like it did on the long weekend.
Hope this will add some input to your situation.
Don  

THAT'S B U L L-S H I T !!! Those injectors have a 200,000 miles warranty !!! Call CHEVY and complaint, DON'T EXCEPT ANYTHING LESS THAN NEW INJECTORS !!!!!