The power required to run a pump is proportional to pressure x volume. As the pressure increases in your tank, the volume drops off. If you were to connect your pump to a valve and an open pipe, you would find maximum current draw when the valve is fully open and minimum draw when the valve is open.
It makes no sense to try to adjust power factor under no load. The whole point is to lower the current requirement, so you want to do it under a typical load. Let's take the extreme case: you have the motor disconnected and add capacitance to the power source. Immediately the current will increase because the capacitor by itself has a very low impedance. Now you may be adjusting the power factor for the rest of your house, so the current at your meter is less, but it's not doing anything for the motor's PF, since the motor isn't even in the circuit.
I suggest you pick up a "Kill-a-Watt" meter; it's the cheapest way I know to measure power factor.
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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