still no start
 

Thought my fuel pump went out, changed it. Still wont start, hpop seems ok,relays seem ok, fuses looked good, really stumped. Any ideas on what it could be. Drove it too work, shut it off, came back out of office about 5 min later and wouldnt srart, cranks all day, sounds dry, like it's not getting any fuel.

How does the HPOP "seem" ok? Have you scanned i to see if the ICP actual pressure is at or above the 500psi needed to fire the injectors? Quite possibly a bad STC fitting on HPOP if it hasn't been replaced.

what tuner are your running on your truck? almost any tuner will be able to monitor the pressure at firing also there is your icp sensor to look at to the plug on that thing like to take a shit :argh: