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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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