i have a 1994 gmc seirra 2500 6.5 turbo diesel. It cold starts hard but starts then idles fine for as long as i want it to (i have had it idling for about 45 minutes then turned it off) but when i go to drive it after about 1 minute of driving it stalls out and it starts barley but it starts for about 5 seconds then dies again then wont starts and wont start again for a few hours after it has cooled back down. it was a slow problem at first it would feel like it would misfire if i gave it more then quarter throat after about 5 seconds of that so i would have to get off the gas and keep a light foot. after about a month of that it had the stalling problem. i went to a local diesel tech and he said it was the fuel pump cause it wasn't running when i put the truck to on waiting for the glow plugs so i replaced that and the relay. that wasn't the problem so i recently relocated the pmd myself and it didn't change a thing. at has to be some fuel problem but i don't know what exactly it is. the fuel filter isn't clogged i change it every other oil change. any ideas?

 

does it smoke at all if it does what color is the smoke

 

when did you move the PMD after start acting up and did you do LP test also you could be sucking air also put clear fuel line on return side pump see if you getting air bubbles

 

no smoke

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i have to try the lp thing couple people have told me that and the pmd was moved after the problem

 

did you relocate with new or with the old one

 

new one

 

oh ya and im not 100% sure but i dont think the fuel pump runs when you first turn they key one before you start the truck like it should

 

just because hear run doesn't mean it working i have seen that few time what happens is motor work but pump part break apart so best thing to is put 12volt right to it open T-Valve see if pump fuel for at least 2mins

 

i did that but the problem persisted but i feel like something with the fuel pump isnt right but it's either two things as far as i can tell the fuel return line or the fuel injection pump im praying its the return line i have to check it when i get a chance if not im probable going to sell the truck as is i cant afford a injection pump

 

so still have the hard start