01 Starting problems

[HotRodDodge]

Hi all, im new to these forums and have been having trouble with one of our work trucks. After a night of sitting the truck is VERY hard to get running, sometimes it would take over an hour to get it to start. So far we have replaced 8 glow plugs, glow plug solinoids, pulled all 8 injectors and had them tested, replaced one, put a new injector pump on it (from ford) and replaced the check valve to keep the pressure. Once we could get it to start it will run rough for about 20 mins and then after its warmed up it runs like a champ all day and starts fine. Truck is a 01 E450 cube van by the way and never has a check engine light or any codes.Thanks for any help

[outlawdiesel]

it soulds like its not building hpop pressure.it could be bad icp,ipr valve or bad hpop.

[HotRodDodge]

Originally Posted by flyin hawaiian

it soulds like its not building hpop pressure.it could be bad icp,ipr valve or bad hpop.

Im new to this forum, what is hpop, icp and ipr?