Fuel not getting to the fuel rail.....

This car is the GTP model with the supercharger. It had been sitting for about 4 years before I purchased it. The gas tank is spotless inside, we've installed a new fuel pump assembly, checked all the fuses under the hood, have power to the purple wire and the brown wire when we turn on the key and cycle it but the pump does nothing...... no hum, no vibration, nada.... Is there another relay somewhere that we don't know about? Is there a sequence of operations to be followed.? This is the second new pump we've tried so we've decided it's not the pump at fault but we're stuck at this point. Tell me we overlooked something so simple I wanna smack myself, cause I'm startin' to hate my life with these cars......