MAF looks good. Voltage and wiring looks correct as well.

Wondering if I have a fuel pressure issue. . I turn the key on. It primes to ~40 psi, and then the pump turns off. Within 1-2 seconds, the fuel level goes to ~20 psi, and to zero within 7-8 seconds. Assuming this isn’t normal from other post I have read on NASOIC. I had in my head there was an drain back valve. If yes, is this s on the pump stock in the tank?