No return gas is coming out of the tbi

What is your question?

When I remove the fuel pump it stay on but when I install it back the truck stall out 1990 Dodge Ram with a 218. How can clean out the tbi return I believe it overflodding the system of to much gas so anyone have this problem I already replace the computer the relay harness wire. Fuel pump and a new Holley tbi i.e. 3443B