Finally after browsing these boards for almost a year, I am able to offer some advice. According to your connection diagram, the blue and brown goto the Capacitor, the green wire is ground, the plain black wire is the "Hot" wire, and if you look closely at the other black wire, there is a small white stripe, this would be your common. If you buy a grounded extension chord you can cut off the end, splice it together with your pump wires and wirenuts, you should be good to go.
