My truck will cool start just fine but when it comes to hot starting or starting once I've ran it it will just crank and not turn over, the truck had been bulletproofed before I got it and we had the high pressure oil system worked on and replaced about 6-7 months ago what could be causing this problem?

 

You have a high pressure oil leak. The term you need to search for is "air test" on your engine, or take it into a shop to have that done.
Likely culprits are standpipes and dummy plugs, but it could be other things too. You need to test it to know.