Originally Posted by ajleeburton
how can the 220 work without the neutral to complete the circuit?
The neutral balances the potential voltage between the two legs. If you measure voltage across the two hots, you should see about 240V. Measuring between either hot and the neutral should result in 120V.
You need to describe your setup in a little more detail. You mentioned a breaker box... does your service from the meter connect to a breaker box, and the pump is connected to breaker in that box?
Also, what exactly are you trying to accomplish with a 30A 120V circuit? That's a bit hefty for a 120V circuit (although not entirely out of the question).