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Discuss Surging jet pump not reaching cut off pressure in the UK Plumbers Forums area at Plumbers Forums

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Hello, I need some help.

Problem: my jet pump fluctuates between 15-35psi and will not build any pressure higher than that. There is a swooshing or surging sound that continually occurs.

Location: it pulls water from a lake to supply the house. Lift is 40ft distance from foot valve to pump is 90ft.

Equipment:
brand new 2 line version of the Franklin electric rm2 jet pump 220v

Brand new Cage/screen, venturi and foot valve

I blocked in the discharge of the pump.
I primed the pump by using a auxiliary plug -in pump plumbed into the top suction line.
I then circulated fluid through and bled the water through a tee on the discharge line for about an hour.
When the pump is off it'll hold the pressure solid so I don't think there are any leaks on the suction line.

The pump continues to swoosh and surges though there's still air in it.

Any advice?
 

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