There is an inlet check system in the bottom of the pump well. I have seen the proper aluminum ball get stuck and not allow the well to fill. Also, I have seen the steel, (larger ball) incorrectly be installed in the inlet check in the bottom of the well and jam-up the circuit. If that has happened, the ball can be very hard to remove. I have seen extreme situations where a Chevy floating cup pump has to be used when the inlet check system is no longer usable due to a wrong or stuck inlet check ball. This is the area you need to look at. Good luck.
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