Drove to work parked my truck on an incline(front up) went to leave 12hrs later put in reverse and it died. Cranked several times and it started but ran for a short time. Just changed the lift pump,( truck still not starting. Bought a hand pump from walmart(kind for boats). Also put clear tube on injection pump. I see bubbles and diesel come thru it but never fill tube completly. Cranked without pink wire and also cracked some injector lines to see if dribble, and nothing. What now? How do I check my injector pump?? Is that whats wrong?