Neighbors 7000 diesel with a Simms injector pump sat for 2 years and he couldn't get it to start, so he asked me to help get it started. From what I was told the injector pump was rebuilt and had less than 10 hrs on it, engine was completely rebuild several years earlier but has low hours. I found moisture had stuck the rack which took little effort to free up still wouldn't start even though the starter speed seemed to be adequate. Pulled the injectors, all were firing at cranking speed, pump timing checked, valve clearance checked, changed the pump oil it was ok, still would not start. As a last resort we pulled started it, it started belching white smoke but cleared up and ran good, allowed it warm up to operating temperature , shut it off would start again, pulled it again time the engine turned a couple rounds it fired up used it for a little while ,shut it off no start again, what have I miss?