Trying to diagnose why not getting power to my fuel pump.New fuel pump ,plugs and wires and opti.New fuel relay.Car was running,drove like a champ but then fuel pump would not prime every so often.Now the fuel pump isn't working at all ,and I'm getting clicking at the bcm.She turns over and all electrical is coming on ,just wont start.

Dont know where to start.Is this is an electrical problem ,or sensor that can make it to where she wont start.

Need help ! out of my expertise