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Thread: Low pressure after pump is on.

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  1. #1
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    Low pressure after pump is on.

    I have a jet pump that will build up pressure and shut off.
    Turning water on, have good pressure until the pump kicks on then the pressure/water volume drops very low. Pump, pressure tank and switch seems to be working. Have not lost prime and have not seen any leaks or water in yard. Any idea what the problem might be?

  2. #2
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    quote:Originally posted by RichardLofland

    I have a jet pump that will build up pressure and shut off.
    Turning water on, have good pressure until the pump kicks on then the pressure/water volume drops very low. Pump, pressure tank and switch seems to be working. Have not lost prime and have not seen any leaks or water in yard. Any idea what the problem might be?
    Does your well have a screen or is it a bedrock intake?? It could a clogged up screen. How old is the well??? Most with jet pumps are pretty old.

  3. #3
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    Do not know about the screen. Well was there when I moved in 15 years ago (pump is newer)and I have not had to pull the ends (two pipe system)up yet.

  4. #4
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    Rechecking the pressure, the pump kicks on around 40psi, but when it starts the pressure drops below 20psi. Why would a block screen cause this? Just lack of available water?

  5. #5
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    quote:Originally posted by RichardLofland

    Rechecking the pressure, the pump kicks on around 40psi, but when it starts the pressure drops below 20psi. Why would a block screen cause this? Just lack of available water?
    Yes, that is just the way they act. Your local health department is the best place to check for a log on your well. Even if they do not have yours, they will know if wells in the area have screens.

  6. #6
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    Replaced pump - no change. Pulled up piping from well, didn't find anything wrong...there's a flapper on the bottom but no screen...am I missing something??

  7. #7
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    quote:Originally posted by RichardLofland

    Replaced pump - no change. Pulled up piping from well, didn't find anything wrong...there's a flapper on the bottom but no screen...am I missing something??
    You very likely would not be able to see a screen.

  8. #8
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    http://www.wellowner.org/
    Go to well basics, then types of wells, well system materials. Scroll down.

    The screen I sat last Thursday was at 120 foot. Sometimes I just glue them on the bottom of the casing.

  9. #9
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    I just reread the first post. With a jet pump I KNOW you could not see a screen.

  10. #10
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    Pulled the pipes up from the well, put a new foot valve (with screen) on, got everything back together, including new pump. Still losing pressure when the pump kicks on.

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