1951 Need help starting.

[Mw548]

I am getting to the point in my project i want to hear the motor start to get me excited. It has the Stock s10 tbi 4.3 and harness. On key up i dont have power to the fuel system coming off pin b2 or a1 on ecm. I jumped the relay to kick the pump and nothing. Is there a sensor or switch that would turn things off things on ecm. I also dont have power at a couple more pins that i thought i should. I should mention that i had to chenge ecm due to accidentally throwing it away with the cab when i junked it. I bought a reman part# 88999152 per vin at chevy. Any help is appreciated.