2003 Cummins 3500 H.O 6 speed running issue PLEASE HELP
#1
2003 Cummins 3500 H.O 6 speed running issue PLEASE HELP
Hey all, New to the forum but have been browsing for a while. I am having trouble with my cummins, here is a list of what has happened so it's not a jumble
-Originally would start idle surged, then leveled out drove great this lasted a few days from purchase
-Driving to work one morning truck surges a few times then dies no start
-Towed to my shop tried cranking on it the next day a few different times with no start
-the next day I pulled the fuel filter and it was black and clogged, replaced fuel filter fired right up, let it run for 20 mins no issue
-Drove truck the next day about a mile to lunch, after lunch fired it up drove 30 feet and died no start
-Got it back to shop let it sit a few hours fired right up, dies after idling about five minutes then will no start, after about twenty minutes will start idle for five then die
-Replaced fuel filter again with Dealer filter, starts, idles for 5 then dies.
-Also I should add if i keep the rpm above 800 it won't die at all when it is running but if I let off the gas it will idle for a few seconds then die, just idling on it's own though it will only idle for a few minutes.
Any Ideas?
-Originally would start idle surged, then leveled out drove great this lasted a few days from purchase
-Driving to work one morning truck surges a few times then dies no start
-Towed to my shop tried cranking on it the next day a few different times with no start
-the next day I pulled the fuel filter and it was black and clogged, replaced fuel filter fired right up, let it run for 20 mins no issue
-Drove truck the next day about a mile to lunch, after lunch fired it up drove 30 feet and died no start
-Got it back to shop let it sit a few hours fired right up, dies after idling about five minutes then will no start, after about twenty minutes will start idle for five then die
-Replaced fuel filter again with Dealer filter, starts, idles for 5 then dies.
-Also I should add if i keep the rpm above 800 it won't die at all when it is running but if I let off the gas it will idle for a few seconds then die, just idling on it's own though it will only idle for a few minutes.
Any Ideas?
Last edited by kcmotorz; 11-12-2013 at 07:33 PM.
#2
#3
I haven't checked it yet, The lift pump on mine is in tank I believe. I don't see a lift pump on the back of the filter resevoir. I am thinking that is my next move is line pressure to the CP3 injection pump and see if it dies off, that is a great idea, thank you for that. I was also thinking it could be bad fuel but I would have different issues and I know the CP3 is self bleeding so air in the lines couldn't be an issue.
---AutoMerged DoublePost---
Don't mean to overpost, but I do know if the lift pump fails the CP3 should still have enough pressure to keep the fuel moving under a higher rpm. So that may be why the truck will stay running at higher rpm then idle ... I don't know just spit balling here.
---AutoMerged DoublePost---
Don't mean to overpost, but I do know if the lift pump fails the CP3 should still have enough pressure to keep the fuel moving under a higher rpm. So that may be why the truck will stay running at higher rpm then idle ... I don't know just spit balling here.
Last edited by kcmotorz; 11-12-2013 at 07:58 PM. Reason: Automerged Doublepost
#4
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