Question about Grundfos JPS4 1 HP Pressure Booster Pump

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My pump cuts in and out when the tap is turned on but now does not seem to pump the water up and does not seem to be sucking. what can I do? is there a manual I can down load on how to do it?

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  • Grundfos Master
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Hi,
If you have not had the electric shut off to the pump then there is a good possibility that the foot valve has gone bad at the bottom of the well pipe....this allows the water to back nto the well adn then the pump gets air in it...then the pump will not pump water....you may be able to get it to go but it will require filling the pipe(s) with water and then purging the air from the pump...

Here is a tip that I wrote about how to do that...


Jet Well Pump Well Jet Water Pump


heatman101

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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If I understand you correctly this is what you have:

- A pump that draws water from a lake 300 feet from lake to your cabin (I assume the pump is at the cabin)

- The pump kicks on to maintain pressure in a tank that distributes water to faucets in the cabin. The pump only turns on to pressurize the tank when water is being used (I am assuming).

- When you turn on tap, pressure in the pressure tank drops to 30 psi, then you hear water sucking from the tank to tap and flow stops at tap. Then the pump finally kicks back on and pressures tank to 23 psi.

- The pump is not used regularly.

If water flow stops when the pressure tank is reading 25 psi, then likely the real pressure is 0 psi and pressure gauge is reading wrong. If this gauge is tied into a switch that starts and stops the pump, then this is probably your problem. You may have partial blockage in your pressure gauge/switch that is causing gauge to move too slowly to keep up with the actual pressure changes when water is being used. Ore the pressure gauge/switch may be broken. Pressure gauges are notorious for reading pressure when there is none. If you can unplug the pump and disconnect the pressure gauge/switch and check for blockage in the ports you should start there. You mentioned that this worked good for the last two summers, if if sits unused for long periods, it could promote bio-growth, rust and/or sediment in the connection to the pressure gauge. If you find blockage, remove it and flush it out. Reinstall the pressure gauge/switch and try it again.

One other possibility is clogged strainer(s) / filter(s) in the water lines. It would not hurt to pull and check/clean any strainers / filters in the system including before the pump. I would even check at the lake for a strainer where the water enters the suction line to the cabin.


I would not assume that the pump is the problem yet.

Hope this helps.


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