1997 Chevy Tahoe No fuel to engine!

I tested the truck with a light and found voltage all the way to the fuel pump. Granted, the light as dim, but maybe it was due to a lower voltage ratting. I removed the tank, pulled out the old pump assy. And found that it didn't work. To make sure, I connected the new one and found that it did work. But seemed a bit slower than normal. I installed the new unit, put everything back together, and started the truck. It ran great for about 2 to 3 min. And then it died. I am not able to get it started again. Can someone tell me what the voltage should be, tired of reading all of my books. Or, let me know what the code would be if I'm able to pick up a tester.

Thank you!

Retired Vet!