Pcm problem?

Hello new to the group, located in Vancouver BC, wanted to get away from my jeep to something more reliable so bought an 08 tundra with 396k on it and no start issues lol.
Well I traced it down to what i thought was a bad fuel pump so pulled it all apart and decided to run a carfax and found out the fuelpump and fuel control module was done 6000km ago so thats what brought me here.
Bought the truck traced power going back to the pump from the relay and pulled the hose at the rail off and cranked and nothing came out. That was my quick diagnosis, had it towed home and tried starting again, fired right up, reved the engine all seemed fine idled for about 30 min then drove around the block and parked. Came back later to move it into the garage it started then put in gear and stalled. So i proceeded to remove the fuel pump.
Now im hear not wanting to spend money on parts if they are fine.
Any advice would be helpful. Im going to do furthur testing but my time is limited so ill do what ican and when i can.
It also has the came tower leaks fairly bad by the looks of it but ill know more when im able to drive it