Dennis, just the filter element and O-ring at the engine.
Most diesel mechanics will use the term "lift pump" for the pump that is ahead of the injection pump, to make clear which pump in the system we are talking about. The Deere parts list calls it "fuel pump." Its the little electric can down on the frame below the injection pump. No need to do anything with it before testing to be sure it works. It runs with the "ignition" switch on.
The tank strainer is at the end of the fuel pickup hose in the tank. Unless it's damaged, just clean it.
How much cleaning the tank needs depends on what's in it. Use a flashlight through the filler and other holes to inspect after emptying it, and see what comes out when you empty it by dumping the last contents out of the filler into a container.
Knotty's method is about what you need to do if there's algae buildup on the bottom. Gravel, dish soap, some water, and start shaking. A quart or two of Stoddard solvent with gravel is an alternative.
You'll want to get the water out after washing.
An ethanol product like dry-gas will do that.
Around here, in low-humidity country, with the tank empty, a few hours in the sun will dry it out. No real need to dry it out after Stoddard Solvent and no water.