2002 Fuel Pump problem, Help please

I would like to say thank you for any help. Someone can give me.

My 2002 tahoe 5.3 liter engine, just stop cranking 1 morning. The fuel pump, sounds as if it's coming on, but not moving any fuel. I took the fuel line from the filter aloose and turn the ignition. Nothing came out the line. I read around to check the Fuel relay terminal wire,supposely you can put a B+ against it, to see if the pumps working, but I have no idea where it's at. Not sure where's the owner manual so i can't look there. If i pour gas in the Intake through the throttle body, it cranks right up.

If you hear the pump come on and there is no pressure in the line even for the prime circuit, tank is empty or pump is bad. To Check this thoroughly you will a wiring diagram to power the pump, make sure this is not a returnless system, different procedures apply. I don't think that year has a test feed for the pump. Either way this is not a dwy repair, needs to be on a lift, drain fuel and remove tank, and lines, not easy.