My 59 180 D had an injector pump on the side of the engine. It had two dipsticks for just the pump. Make sure it is well lubed. (they are VERRRRRY expensive)
Check all fluids.
I'd go ahead and pull the injectors out ( they go in where they look like spark plugs should go except, of course, they are connected to fuel line ( banjo bolts maybe) .
drop some oil into each cylinder and crank it
let the fuel squirt ( without injectors!!!) a bit just to clean the lines.
Be aware that as you crank the engine, the fuel can come out of those injectors at 1,700 psi. It'll blast right through skin if you are in the way.
Oh and watch your back. Those grilles can bite easily.
What model? Finback?