First Post and need help with a no start

Have a 2000 Tahoe, 5.3L and died today while going 20 mph up a small incline. It tries to start, but acts it is not getting an fuel. I am new to the site and trying to solve this myself. So any help would be appreciated. Is the fuel pump? How do I check the oil pressure switch? I did notice the low oil pressure light come on right before it died. It has been running a little rough at idle witht he AC on.

Please help. Were can I find fuel pump replacement instructions?

Thanks in advance,
Kenny