99 dodge Cummins problems needs some help
 

So yesterday the wife and I drove around in my truck all day no problems ran just fine went in to get groceries and it would not start no simptoms so I loosend 1&3 injectors and cranked till I got fuel and tightend them up and it started and ran fine all the way home my question is do you think my lift pump is out or should I look into a new vp

What fuel pressure are you running?