Starts up for 5 min, then dies and wont start again

[blaazeorange81]

My 1999 Yukon will start up, run for about 5 minutes at idle then die. Then it will not start again till the next day.
I hooked up a fuel pressure gauge to the fuel line at the fuel filter. It started up, and the pressure gauge went up to 54. I gave it some gas and pressure goes up to about 60 then back to 54 at idle. I sat and watched it for a bit then it died after about 5 minutes and the gauge went below 50 to about 48. I immediately tried to start again and the pressure actually drops a little while cranking to 45 and stayed there.
Whats weird is when I first started it up, I can hear the pump come on and it kicked the pressure up from 0 to 54. Then after dieing, I don't think I can hear the pump come on, and the pressure does not go up at all. I have a feeling tomorrow it will do the same thing, start up after sitting for awhile, then die after 5 minutes.
Does this sound like a fuel pump going bad? or does it sound like an electrical issue with the fuel pump?

Thank you

[maxwedge]

Fuel pressure needs to be at leat 60psi.