It looks like a water well head.
It could be a booster pump if the piping that goes into the ground is connected to a distant water source.
Does the spigot you show in pic 4 run water?
Where does the piping that runs upward out of the tank go?
Electric - can you trace the wiring that comes into that outlet? If yes, you could probably run new electric if you need it in this area.
You might need a pro to tell you. If it does go to a well or another water source, you could remove that existing pump and tank, borrow or rent a pump, like they kind you would use to pump out a basement, prime it (with water) and see what comes out.
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