I have a 2008 silverado some fuses in the fuse box is not getting power like the fuel pump and starter not kicking in and the injectors is not turning on please help

Let me start by saying I replaced mass air flow sensor and fuel pump so far but the issue still occurs when I start the truck in the mornings it acts like it's not getting enough fuel but once it's started it idles and runs just fine if I start it soon after it starts fine as well only does that after a few hours of sitting. Anything you all recommend to check other than fuel injectors as those are gonna be tested today?