5.3 swap finally finished... not so fast.

[70c10guy]

So I finished my swap and drove it for about 10 miles. Started actin up like it wasn't getting fuel. I cracked my holley 650 dp open and lots of rust in there so I rebuilt it. Slapped it back on and it started happening again. This time I'm not getting any fuel pressure. My setup is stock tank, 5/16" hard line to a carter p4600 hp pump, to a filter, to a regulator to my holley. There's 0 fuel pressure. I 100 percent wired the fuel pump right with a painless relay kit. Should I check the pump, the fuel sending unit, or the filter. And how should I go abouts doing this?? It was a blast driving it butthen left me stranded as thebowls were notgetting filled.