I am in the process of completing a TPI swap in my 1990 rs and i am having an issue with the fuel pump circuit not functioning.

THE FACTS:

-The car is a 1990 Camaro rs and came with a 305 TBI auto.

-The engine and wiring all came out of an 87 Trans Am Gta, and it is a 350 MAF TPI auto setup.

-It has all new sensors

-All of my relays are in working condition

-All of the sensors and plugs has been appropriately placed

-The fuel pump has been replaced to an 87 TPI pump (it has been tested and works fine)

-The Car wiring worked perfect with the last engine harness

-The Trans Am motor and Harness had no issues.

-The Trans Am motor blew and i had the motor professionally rebuilt. I then proceeded to swap the setup into the 90 rs because the 305 tbi blew also

THE ISSUE:

-Something is wrong with the fuel pump circuit.

-Everything else has been tested for power and ground and works correctly

-The sensors and plugs have all been checked and rechecked based on appropriate diagrams

-The pump will only turn on if it is powered with a jump wire.

The main issue is the fuel pump does not turn on when the key is turned to the on position. I need for the pump to turn on and function correctly.

Where could my problem possibly be? Could it be because i put an 87 harness in a 90 car? Thus causing a connection problem at the bulk head?

I have ran out of options and ideas and i could really use some help. Thank You all.