ive neaver heard of capping each line to test ur injectors but it might be true

 

how can u tell if the relief valve has popped?

 

from what i understand if its poped it sends the fuel back to the tank so if u cap it it stops the fuel from going to the tank and the pressure will build up and hopefully your truck will start. i think its supposed to pop if ur rail pressure exceeds 28,000 psi

 

damn dont start usin startin fluid on it...thats an enemy

 

well I just capped the rail and still no start. thanks for your help. I guess ill keep posting on here and maybe someone will have the answer for me

 

hmm

 

once I get it started it runs great I've driven it all over the country pullin trailers heavy horse trailers, nothing seems to be wrong with it accept it starting

 

tack up ur rpms quick like above 2k and leave off the throttle does it hang their for a couple seconds or come rite down if it hands their an injector/s are over fueling

 

ok the tac does hang for a second when I rev it, so now do the injectors have to be replced or is there some other way to fix it

 

when i used to work on heavy equipment, i had a couple dozers doin the same thing..it would run great for a few minutes, then would start losing power, then die...and it wouldnt crank back unless u had startin fluid..it was runnin off the fuel in the filters, but once they were empty, that was it...checked all fuel lines 2 see if any were collapsed, checked fittings everwhere to see if it was sucking air anywhere...everthing was good, except the lift pump...1st one i ordered was a brand new one put it on, same problem..ordered a 2nd new one, installed it, dozer ran like a champ. not sayin this is the case with ur truck, but its some experiences i have ran across..this was on CASE dozers, and CASE uses CUMMINS!!! maybe this will help man, sure hope ya get it fixed.