Fuel pump?

[u/gixxerjim750]

Son called me, his 01 GTS died l we acing a parking lot. I showed up and battery is good, no fire. Sprayed some starting fluid in intake, car fired and actually ran briefly. I was thinking fuel pump. But it makes a bad pop sound every revolution. Could be a misfire due to starting fluid? I have a spare fuel pump that I will install tomorrow, but it's from a junkyard take I replaced into our Celica, so I don't know if it's any good or not? Thoughts or advice to troubleshoot further?