I have a GE deep well jet pump 1/2 HP. With a square D 30/50 cut out switch. The pump use to cut out at 50 psi and now the pump will only produce 43 psi and does not cut out. The well is only 18 feet deep. I replace the foot valve last year. The pump has two hoses that go down to the bottom of the well.

How to test if the low pressure is caused by the pump or the ejector at the bottom of the well?

Thanks, pete