So I have a 99 chevy suburban 1500. Replaced fuel pump back in Feb.(present day) as it started to get cold the truck took longer to start. If i turned the key on for about 5 seconds it would start as it was a new truck. about 4 days ago it started then cut back out about a second later. Jumped right into it and changed fuel pump again under warranty( the pump was not cutting on so i asumed it was it) Changed relay and fuel filter still nothing. I am getting power to the pump for about 1 sec then the power stops the pump actually never cuts on though but their is power for that sec checked harness pulled pump off and checked it everything works when hooked up outside the truck (directly to battery) At this point im stuck and dont know what else to try. It blows me away that i am getting power then it goes away without making the pump work. anyone have any ideas beside the ones that i have tries thanks a lot John