LT1 Conversion will not shut off

[Samckitt]

On Mine the PCM controls the coil side of the fuel pump relay. On the switch side one end goes tot he fuel pump & the other to the battery. It is two totally separate circuits, power from one side should not go to the other.

[Badley]

Ok so I got it figured out. I created my own problem because i assumed what a wire did. I mounted my computer in the trunk so i have a long harness. There was a wire in the harness that runs from the computer to the front of the car. The wire was labeled power to fuel pump. Well I thought i would shorten the length of the wire, so i cut it and ran it to a constant power junction block in the trunk, which worked fine. Then I got the great idea of powering my igniton from the junction box on the firewall. I decided to use a butt connector on the before mentioned cut wire, which I thought was just a through wire, and then tied it into the junction box on the firewall. Well come to find out, the power to fuel pump wire, recieves a positive feed from the oil pressure switch. The oil pressure switch serves as a backup system for the fuel pump in the event the fuel pump relay should fell. Any time oil pressure is above 5lbs, 12 volts are porvided to the to the fuel pump.

So what was happening was once the car started, the ignition wire was recieveing voltage from two sources. I would turn of the key killing one source but the oil pressure sending unit would continue to send 12 volts to the computer.

So lesson to be learned here:
1. Never assume anything, it always makes a a** of u and me.
2. Dont muck with someone elses wiring harness.

Thanks to all those who chimed in on this.