I've converted my 1975 Chevy Truck to TPI from 1991 Firebird 5.7 GTA. I've modified the donor's wiring harness without emission stuff. I order new EPROM without VATS and emission stuff. When on "Run" position I can hear the fuel pump run then stopped (maybe pressure buildup then stop) when I start the truck the truck starts, as soon I let the key go to "Run" position engine dies.

I've used the truck existing coil positive wire (hot while start and run). Ran the ECM and fuel injector wire with 10A fuse on the fuse block terminal hot while Start and Run position. Please help I'm sure I got everything connected or the truck wouldn't start at all.

 

How are you powering the fuel pump?

 

from the ECM with relay...I kept the existing fuel pump relay and wiring. I ran gray wire from GE13 pin of the 7730 ECM to the fuel pump "+" terminal.

 

Is the pump still running when you stop cranking?

 

yes still running I believe...when the engine stop I can hear the fuel pump running...by the way I'm using inline fuel pump from Walbro.