I THINK I may have solved my problem...
Again, thanks to all for the advice. I had a good friend, who is very well versed in the mechanics behind diesel engines, take a look at my situation. The problem, for me, anyway, was leaky fuel lines causing air to enter into the system. Once we tightened all of the clamps, the engine started right up. I've only had this boat for a little over a month, so, I'm still discovering new things that need to be tweaked. Hopefully, I'll have no worries tomorrow, getting the boat over to the hoist.