Cut off and Engine will not start. Had vehicle towed home.

Yes, I have spark. It will hit/ run a little by spraying starting fluid through the throttle body. I also sprayed gasoline in the throttle body and it only hit/run a second. I checked for current at the injectors and there is. In my initial send help message, I meant to say there appears to be an electrical problem not electrical pump. I have probe wires to make sure there were no breakage or short. Like I mentioned the engine ran great in the salvage vehicle but when I installed it in my vehicle, the same problem remained. I even replaced the fuel tank. The ECM was not used from the salvage vehicle because of the transmission and it was different than the manual.

Fuel pressure needs to be checked!

When I checked the pressure while cranking I had 30 psi but most manuals states checking while engine is running. I even checked by jumping at data connector. Had the same. Are these false readings? If it won't start, what other means can I check it?