03 6.0 wont start

[crdawgs11]

I have a 03 f350 6.0 that will not start. It has been running great, I pull equipment with it everyday. This past year I have had new oil cooler egr valve, High pressure oil pump and sensor replaced. I bought this used and not sure on the stud bolts. Not sure why it wont start. Tried to go to work Saturday morning and nothing. Any help would be appreciated. Thank you.

[dvsails]

got probs myself
I decided to get the autoenginuity diagnostic tool
the only way to keep from just replacing parts
now i have to learn how to use this thing
To deal with my truck i started googling symptoms that im having
to begin. also getting a fuel pressure gauge as a first step
I understand that you need to always have at least 48psi , or you have probs