6.5, no power, starving for fuel?
 

i have a 95 gmc k2500 6.5 TD vinF with 108k miles. cold air intake and 4 inch straight pipe.
the truck is pretty much 100 percent stock with the original pmd. my concerns are if you hammer on the gas right to the floor, the truck will sputter ilk its not getting fuel, and when i pull a landscaping trailer with a zero turn more and a walk behind, single axle, its almost like it can't take it, blows black and heat climbs, my vortec does a way better job. also when going about 65 -70 on the highway, the check engine light comes on, and runs fine still, but the light will go away when i lift off the gas. then i lay back into it and in 5-10 mins or so it happeneds again. i haven't got a chance to read the code on the highway cause i need a buddy to come with me so i don't end up in a crash. any ideas? i looked around but other similar stories involve the truck stalling, mine has never stalled.

It's probably a low boost code. That will make black smoke, low power, and engine temps to climb. Need to hook up a boost gauge and make sure that there is no boost. If there is no boost, it could be bad vacuum pump, boost solenoid, broken vacuum line, or bad turbo. You could tie the waste gate actuator shut, but without a boost gauge I would not leave it or drive it really hard.

If you are getting a SES light on the highway it will be there when pull the codes is the truck OBDI or OBDII????

the trucks vacuum pump looks like heel, theres a rust hole in the canister and the rubber hose doesn't connect tight anymore, but when the truck at idle, i can't move the waste gate so is is working? and my trucks OBDI, i have a snap on redbrick scanner ill check it with today

Well black smoke is normally going to compute to either to much fuel, or not enough air. Since your truck is stock, im going to guess the amount of fuel is correct. So i am also going to go with the vacuum/boost issue.

If you have someone else start it and you look at the waste gate, it should move when the truck is started. Still the best way is with a gauge to see the amount of boost. You might be able to read boost on the scanner. I'm not sure if OBD1 shows it or not. But there should be a MAP/boost sensor on your truck, so the scanner should read it.

I've checked for codes and there is none what so ever. the highest boost the truck has hit was 3.00 and at idle its 2.17 (according to the scanner, not sure if its lbs) but everything seems to be in check, waste gate moves on start up, and i can't move it while running. only question is, is the boost too low? it may be working, but is it efficient and what is it supposed to push stock?

You say the PMD is stock do you mean that it is still on the IP?? if so the symptoms you are describing and no DTC codes sound an awful lot like like the PMD may be failing you should probally consider relocating it to a heat sink outside of the engine compartment alot of people like myself like and use the behind the bumper as a good location here there is not near as much vibration and good cooler air flow which will prolong the life of the PMD

truck is out of commission, driving home one day it started sputtering real bad like it does at full throttle, stalled a few times and ran real rough and finally died. there was diesel all over the 2nd to last injector on the driver side, i smelt diesel for a few days but figured it was a fuel return line. i think something happened with the injector or that fuel line, have yet to start ripping into it :argh:

Does sound like a bad PMD,but also like low boost.
Get a boost and EGT gauge installed asap for diagnosis and engine protection.

Black smoke spikes the EGT';s and can cause a meltdown in short order.

Very likely you are on the money with a leaky fuel return line,injectors can leak at the seam where they are assembled but that is more often a problem with recent rebuilds.

since I'm going to have all the parts off i will install a boost gauge to figure out that problem. pmd is expensive as i just spent 250 on 8 injectors. also got valve covers, new fuel return lines, and injector lines. i don't need the intake manifold off to do the pmd so ill hold off on that and see how she runs when i get her fixed, ill keep you posted

Ok so you do have recent injectors,check for a leak at the injector seam where they screw together.
Might need warranty on 1 or more?

ive got a 98 6.5td and i dont have any boost at all...unless the gauge is no good. But i am having other issues then just not boost. When i got the truck i drove it two hours away from home and when i left the guys house it started like missing out and then it ran fine after i just kept driving it cuz i didnt wanna hafta tow it home. I got it home and that night i drove it to work. the next morning it was raining and it started misfiring and sounds almost like a backfire and everytime i would push the pedal it would just kinda stall but it would idle just fine. I got home and shut if off and now it wont start. It didnt start for like three weeks. This morning i went out and did some interior work and just sed what the heck lets try and start it. It started after i had to push the pedal and let it crank over for a little bit. I know there was medal shavings and black debris in the fuel filter and i cleaned that out and changed the filter. I drove it down the road and ran fine. I pulled in my drive shut it off and started right up shut it off did some other work in the garage and i came back out and started it and revved it up and it started doing the same thing it has been doing. and it stalled and now it wont start again. I know the IP has been replaced and i know the PMD is still on the IP. when i get some extra money im going to move it to the front bumper like my other one. Could it be the PMD or could it also be the OPS. I the LP runs while the engine is running. It seems like it dont have any power and its starving for fuel. It also blows black smoke. I dont know what fishbite is but it seems to sputter and misfire and stall. Please help I cant a afford to drive a 3/4 chevy with a 6.0 that gets 12 MPG. Thanks

Sounds like a failing PMD as far as stalling and rough running go-moving the original PMD will do nothing for you,there is no repairing them-it's time for replacement with a new PMD/heatsink and PMD resistor with extension harness.

You need to diagnose the no boost condition,it the truck smokes black under accelleration you are causing very high EGT's that can melt down pistons.