They can be a bit of a pain to get running, particularly if they're cold, using a slave cable makes things much easier, especially in the cold.
A bit of added info on running them dry... there's no float switch in the tank, or low fuel shut off, they'll run themselves completely dry. Also, if you recieve a generator that had been purged, you'll have to prime the filter and lines.
I was at a few 2k gens myself the other day, just to clarify, the two phillips screws are on the top of the fuel filter, but they're "in back" (on the side facing the engine). Turn them to re-prime the filter and lines if the engine has been run dry. Turn and leave open till diesel diplaces all the air in the lines and filter, it will run out through the screw, so make sure your drip pan is under the generator. Close once primed.
The line from the tank to the filter should be easy, gravity will cause fuelt ot run, and the filter is easy, again, gravity. The line from the filter to the engine may not fill so easily, might take a bit of wiggling and twisting to get all the air out. Some will have clear fuel lines, so you can see the air bubbles, some may have black fuel lines, so you'll have to watch for air bubbling into the filter.