What this plug in picture does on a 2005 Ford F-250 Super Duty?
What this plug in picture does on a 2005 Ford F-250 Super Duty? - 1 
Goes to that thing that doesn't work right now. If you trace the wire back to the other end that we can't see, that may be a clue, unless it goes into a harness. The color of the insulation could be a clue if you look up the color code. Wires are typically not longer than they need to be, so keep eyeballing that area.
Dude. That vacuum line plugs onto the fuel pressure regulator just to the right and above the yellow dipstick. It's plain as can be that there's a vacuum line missing on the fuel pressure regulator!
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