My 2001 duramax has 125K. It had injectors @77K. I had a mechanic leak in the line at the high pressure fuel pump a month ago. Last week driving thru town truck lost power, lots of smoke. Eventually it died and wouldn't start back up. I waited for 30-40min and it ran long enough (in spurts) for me to limp back to shop. I changed out fuel filter and it ran good for 10 mins and then lost power again. Next day I drained fuel tank and dropped it, took out fuel pick up assembly and cleaned same, put everything back together w/ another new filter. Drove around all afternoon fine. Yesterday drove fine until late afternoon it died again w/ same symptoms. DTC P0093 is set. Had truck towed back to my shop. Truck ran when it came off the roll back. When truck was dead on side of road, I tried to prime filter but couldn't budge the pump button-normally I can push it in... Don't want to take to dealer...

Fill out your sig and inlcude any upgrades/tuners/etc you have.

Search that code p0093 (Large fuel leak). You should get lots of possibilities.

Could be loosing prime, but since it seems to self correct, maybe not.
Wiring harness? Edge tuner? Crank sensor? FPR problem/CP3 problem?

My guess is the large fuel leak is into combustion chamber, thus the billows of blue smoke... What is my sig? I have a boring box stock 2001 duramax w/ no after market nothing on it. Just a boring travelling tool box to work on all my other projects- oh yeh and to do my job...

I have been researching DTC P0093 and reading all other posts of similar problems and been asking justanswer.com and thinking about it more. A friend yesterday with an 2005 dmax said he got the exact same symptoms as I have from a loose turbocharger plenum?? As I understand it DTC P0093 indicates low fuel rail pressure. If the pressure were low due to a bad pump or FPR then I would think the symptoms would be similar to running out of fuel. Since I see large quantities of blue smoke, I am guessing that something is holding one or all injectors open and the pump can't keep up and thus the DTC 0093 is set. Is that plausible? What would cause injectors to hold open? By the way the truck runs fine after a day of rest... Please help

Well, when my injector pump went bad it had a p1093 (low rail pressure during power enrichment) and a p1094 code (low rail pressure at idle). The truck started and ran fine, no smoke or anything but it didnt have any power at all. The blue smoke might be a sign of injectors. Maybe theres a leak in the fuel system somewhere? check your oil to see if theres fuel in it.

My guess is the large fuel leak is into combustion chamber, thus the billows of blue smoke... What is my sig? I have a boring box stock 2001 duramax w/ no after market nothing on it. Just a boring travelling tool box to work on all my other projects- oh yeh and to do my job...

A "sig" is your signature. Located below every thing you post. Fill it out so we know what year your truck is and if it is stock or not ,which in your case it is stock. It helps us help you with your questions.

I had the same code this winter, but I think it was from it being so freakin cold up here and it was on it's way to gelling. But I reset the code and haven't had a problem since.

So I have been talking to the guys at justanswer.com. They say I've got to have a gm tech2 monitor fuel balance rates to check condition of injectors and to check fuel rail pressures and FPR performance... I go back to my symptoms: Intermittently, when hot, not necessarily pulling big load, all of a sudden loss of power with great quantities of blue white smoke coming from exhaust, and a DTC P0093 set. Condition worsens to the point that motor stalls and won't start. The cure is to wait. Both times it has occured, problem has disappeared overnight. The DTC clears when motor is running well. What I read here is that something is telling an injector or more likely all injectors to stay open to the point that fuel pump cannot keep pressure up in fuel rail. Either injectors are stuck or there is some mal input to the ECM or some false signal being given to injectors. Now I am repeating myself. I desparetly do not want to go to dealer. Thanks for listening. I hope someone can help.

So I have been talking to the guys at justanswer.com. They say I've got to have a gm tech2 monitor fuel balance rates to check condition of injectors and to check fuel rail pressures and FPR performance... I go back to my symptoms: Intermittently, when hot, not necessarily pulling big load, all of a sudden loss of power with great quantities of blue white smoke coming from exhaust, and a DTC P0093 set. Condition worsens to the point that motor stalls and won't start. The cure is to wait. Both times it has occured, problem has disappeared overnight. The DTC clears when motor is running well. What I read here is that something is telling an injector or more likely all injectors to stay open to the point that fuel pump cannot keep pressure up in fuel rail. Either injectors are stuck or there is some mal input to the ECM or some false signal being given to injectors. Now I am repeating myself. I desparetly do not want to go to dealer. Thanks for listening. I hope someone can help.

I would definitly take it some where and have them test the injectors. Have them check balance rates and return flow rates.

So the problem is becoming more consistent. It occurs regularly now after about 20 mins of normal driving. Today I took it out for a test drive being very observant of any precursor symptoms. As I felt it begin to loose power, I eased off the throttle and nursed it along until it finally died and would not start again. I got out and checked the primer which was stone hard. I released the pressure by openning the filter drain and ran some fuel thru the filter with the primer. Closed valve re-primed and the damn truck started up. I drove about 1/2 mile and it died again. I repeated procedure and truck ran fine all the way back to shop... At least I have found a way to avoid tow truck fees...

Almost sounds like an injector is sticking open, which can burn the piston.
I don't have a clue as to what your symptoms mean. I don't remember ever reading of this issue where it didn't loose prime, and "draining fuel" and repriming gets it to start up.
Where are you located? Maybe someone can recomend a good dealer with a good Dmax tech. Really need to get some one with a tech 2 diagnose it.

Well I broke down and sent the truck to a shop that has a tech II scanner (not the dealer). He thinks the problem might be in the fuel lines from the tank. I will post the final result as soon as I hear something.

I took the truck to my local mechanic who has a tech II (Joes Proffesional Auto Repair, Rockville, MD). They hooked it up and drove around until the problem occured and saw that the fuel rail pressure started dropping as the problem progressed. Apparently there is a bulletin about the flex lines between the fuel filter and the tank lines collapsing when they get old. The problem has not recurred yet since the lines were replaced, so I hope it is fixed! I am contemplating adding a lift pump to a primary filter ( it would be nice to have a clear bowl like the one on my Cat). Any suggestions? Will a lift pump make this thing start instantly? In retrospect I think the reason you see lots of smoke when fuel rail pressure drops is that the fuel is not atomizing thru the injector(what fuel there is) thus doesn't burn well?? So why does the primer button get hard when this problem occurs???