Awhile back I purchased a 98 Ford Ranger 2.5 4cyl that had a blown head, the head was removed before I got it. I got a new head and assembled it on the motor. Started the motor and the head sounded like it wasn’t getting oil, so I replaced the oil pump too and that helped. After putting the new oil pump in, the truck won’t stay running. It will start and sound good for 5 to 10 seconds and then it sounds like it’s building pressure, starts to sputter and eventually dies. It won’t start again, but if I wait for about 30 minutes it will and then goes through the same scenario and dies. I replaced the Cam Position Sensor, I’ve tried re-timing it a dozen or more times, but nothing seems to help.



Does anyone know what could be going on with this or know any tests that I could do to see what's happening?

 

You are running out of gas it sounds like

Dirty fuel filter will limit flow

Try spraying gasoline or quick start(Ether) into the engine after it stalls, 50/50 test
If it fires again then yes, you are running out of gasoline
If it doesn't fire up then you have no spark

 

I will give this a try, thank you.