crookson speed

so i installed a new 225lph pump in my ef b16a obd1 swap previously working.put the gas tank back up started it and it worked for a couple seconds until it died out and threw a code 0 at me. i know my grounds are good, i tested the fuel pump wires they are okay. wires from the main relay to the ecu are okay my main relay ground is okay. i used a working ecu and it gave me the same issue except no code 0. i did a voltage test with the key in and the only pin at the main relay with volts was the one comming from the battery none at the ecu wires where ther was previously. the fuses seem to be okay. (what fuses can i look at in a ef that have to do with the fuel pump) can the engine harness be grounding out becaue i did alot to that. im really stuck where do i neen to start looking. thank you much for responses.