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Is the pump chamber really full of water?

It seems late for an answer, but what you need is ANY float switch that will switch 10 amperes current. That switch can be placed directly in the power line to the pump. Septic pump systems also...

Two probable answers, both with probable minor danger!

CA first, then the US, outlawed potable uses of brass and other
alloys containing lead or other certain metals. They also
outlawed all...

There may be an airlock in the suction pipe, and the 10 psi comes from just circulation of the water around the pump cavity. Or, it can be end-of life, when the pump will churn inefficiently.