I readily admit to a certain amount of ignorance with diesels so I'm asking for some insight to this problem. This past weekend I helped my younger sister swap in a low miles diesel from a CUCV into her 1984 diesel Blazer. We bleed out the fuel lines to each injector and got it started. It initially ran OK with a small miss and a little gray/white smoke but we noticed that the mechanical fuel/lift pump was leaking from a torn diaphragm. Swapped out the fuel pump for the used one from her old engine. Bleed things out again and now it sits and huffs & puffs out gray/white smoke. If it was a gas engine I'd say a spark plug wire was missing. If you hit the accelerator it blows out a large cloud of gray/white smoke. Back of the truck disappears in the smoke and tailgaters back off a few miles. The engine was pulled from a running CUCV with about 1500 miles, but set for two years in storage. My brother-in-law pulled the engine at a job in Arkansas and said it ran with no smoke. From what I've learned on this site I am guessing unburned diesel fuel is the cause of the gray/white smoke, but is it possibly a sticking injector or some other culprit.