Tractor Repair: 1956 30 Massey Freguson Tractor, injector lines, fuel filter

Question
When I run all the fuel out, how many cyclinder do I need to bleed? Should I bleed all four or just one?

Answer
  I am assuming that you are trying to bleed the injectors on a diesel that ran out of fuel.  Bleed the fuel filter first, then loosen all the injector lines on all the cylinders.  Crank the engine over until fuel squirts out at all the fittings, then tighten them up again.