Q: I changed the fuel pump and truck ran great for 3 days. Now after 3 days, the truck dies. It will start running for a few minutes, then dies like before.

I was advised to change the fuel pump. Truck would start but run just a few minutes, sometimes few seconds. Sometimes I had to let it sit for 15 minutes before it would start. Mind you, it would crank but not always start immediately, but eventually it would start. It started more times than not. So I changed fuel pump on 9/15/16, truck ran great till 9/18/16. Now same problems. Starts almost every time instantly, but runs for few minutes great then starts running rough for about 5 minutes then dies. I let it sit for 30 seconds and fires right up and goes through running ritual then dies. Please help. I'm hoping I don't have to remove bed again, but will if need be. Thanks very much

My car has 150000 miles.
My car has an automatic transmission.