trooper not starting. fuel delivery problem
 

Hey all,
Just replaced my ERG valve. And ran a diesel treatment through my fuel system about 300 miles ago. It's gasoline LS with the 3.2 v6. I tried to start it was fine, was driving, acted as if it were out of fuel. once towed home i tried to start it started for maybe 2 seconds and shut off. does this every few hours if i attempt.
Is this my fuel pump? my fuel filter? or anything you know of?

Thanks so much

-Noah