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Discussion Starter #1
I have a 2002 duramax diesel that i have been working on for weeks now and im stumped.
It has troubles starting sometimes takes me as long as a few hours once the temp goes below 45 degrees. Once i finaly get the truck running, it runs great. getting on freeway, ill put it to the floor and it will hit 120 in no time. drive it untill it gets to running temp, park it, and wont fir back up.
220,000 miles

NEW (not reman) injectors with 15000 miles

Was running a edge cs programmer but it bunt up my pcm so now i just use it for gages

MBRP stainless 4" from turbo back.

AFE filter

Like i said, im stumped and this truck is my daily driver i need to get me to school and i dont have the money to take it to a dealership. I have put countless hours trying to diagnose this problem and ive gotten it down to i believe it being a fuel problem. Any ideas?
 

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Ever consider it may be a glow plug problem? Try plugging in the block heater cord and see if that helps at all.
 

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Check for leak in fuel lines from tank to engine.
 

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Discussion Starter #4
It has new glow plugs that i tested and they are powering up. it wont start it the truck is at 190 degrees outside and my dumbass apartments wont let me plug it in.
As for checking for the fuel leaks, what is the best way? and is there a way to test the injection pump?
 

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Discussion Starter #5
i put ether in it once to see if i could get it to fire and it did fire... i dont wana run it anymore thoe. i just needed it started that morning.
 

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On the filter housing, pump the primer before you stsrt it-- if it starts OK and stays running, you may need a fuel filter housing or reseal yours with parts from our vendors.

If it is still hard to start when warm, you need the injectors tested-- when they leak a lot, the CP3 does not build enough pressure to inject the cylinder.
 

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Discussion Starter #7
I have pumped it to build pressure and it will sometimes work but im not sure if it is from quincidence. Ill crank and crank, cycle it over and over, watching everything on my guages and it all seems fine but doesnt fire. sometimes it will do its fire than instantly die, then fires and dies, then wont fire at all. this morning i was working on it for almost an hour and couldnt get it. walked away for 20 min to go get some more tools, came back and it fired instanly without a thought.??? it doesnt make since to me. last night i drove up to the mountains outside my town and it was sitting in about a foot deep of powder snow and about 20 degrees. never had a trouble fireing. it does it as it pleases.
 

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Hard to say--?? Might check for codes first. You are almost going to need a Tech II to see the fuel pressure-- demanded, and actual.

You mighty disconnect the Edge completely and see if it helps.
 

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Discussion Starter #9 (Edited)
i have disconnected it compleatly to check it and it doesnt make a differance. could the filter houseing cause these problems and what is the way to check it if i dont phisicaly see a leak. i did push the shrader valve in with the key on and there was no pressure untill i pumped it to as hard as possible. pressurize tank maby? :/
Also what is the deal with the lift pump? is there one or not cause ive been told not yet i can buy replacement ones.
 

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You could be sucking air randomly from a loose filter or cracked filter housing. Your primer bulb should be hard all the time. I would check it first when you have a no start issue.
 

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Discussion Starter #11
wait hard all the time? even after truck is running or sitting? its never hard. it usualy takes 10-15 pumps to get it hard...
 

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look underneath the filter when you prime it and make sure it isnt dripping fuel anywhere. thats what mine was doing. then i got the billet wif delete plug and a new filter. no more leak
 

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If the truck is off it should hold pressure on the fuel system. If it is not it has a leak in the system. I would start by checking the fuel filter. Then look for leaks around the filter head.
 

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Discussion Starter #14
ok, didnt find any cracks any were but i think it may be the problem. i pump it and it will never get compleatly hard. i can always pump it with my thumb. i got up close to see if i can see a leak and i noticed a noise that sounded like air leaking by a seal. if i crank the engine then open the bleader to get air out and then pump it about ten times, engine fires then dies then fires fine second time. if i dont crank engine first, it fires right up. it gets stiff but will never get hard to the point were i cant push it or even to the point that i struggle pushing it. this originaly started with the truck not starting in the morning then got to were it never started. also bulb take minimal time to have no pressure.
 

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the primer seal may be bad.
 

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Discussion Starter #16
and would this be y i cant get the truck started in the mornings or is this just something else on top of another problem. and what is the best thing to do cause it seems like this is a common problem. is there an aftermarket primer pump that is better to run or should i get a new pump from the dealership?
 

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you can rebuild it. Yeah some seem to have problems with them, alot of ppl buy a lift pump and do away with the factory housing and some rebuild them or buy new ones. have you checked the rubber lines they could be dry rotted. and you could have a rusted line with a pin hole sucking air. alot of little things can cause it. if its not getting hard id say its the primer seal.
 

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Discussion Starter #18
Alright cool! fixing my pump will be my next step and hopefully it will solve my problems. Ill let yall know if it workes or not.
 

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Discussion Starter #19
alright guys, woke up this morning and primmered it befor i cranked it and it fired without hesitant, so now im almost possitive that has been my problem the whole time. now my question is, im looking at the pureflow airdog system with the lift pump. would this be a good replaceement to put on the truck and bypass the primer pump all together?
 

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That will be fine, if the Air Dog has filters. The filters are usually cheaper than the stock filter and much easier to change.
 
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