Pump Running but not building any pressure

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  #1  
Old 03-31-12, 05:01 PM
Q
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Pump Running but not building any pressure

I have a Deep Well jet pump has two pipes going to the well one pipe is 1 1/2 the other is 1 1/4 and it goes about 50 ft down. I believe it is 110v, it is a McDonald with a Square D pressure Switch. I dont know the tank size or the age.

Here are the details, the other day I noticed that my Pump was short cycling. I read that one reason could e that the tank was water logged. I have a glass lined tank, ie bladderless, so I drained the tank. when I wen tot pump water back into the tank the pump wasn't pumping any water. a little more research revealed that I needed to Prime the Pump. After much work Got it Primed and running. was getting a high pressure of approx 40 psi set the low to 20. Pump was running really good but still short cycling. this time I noticed that the tank wasn't holding pressure it would build to 40 then within a min drop to 20 kicking on the Pump. I Replaced the Foot Valve. primed the pump. it runs but it is now not building any pressure.

Can some please help.

Thank you
 
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Old 04-01-12, 06:24 AM
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There's 2 possibilities that I experienced with my well this week. The first one is the venturi in the jet body may be clogged with debris. The second is you've developed a vacuum. Not sure how your well head is set up. My well head is about 3' below grade and in a concrete box with a sheet metal lid. After working on it the ther day and turning pump on it would run but only get me to 45 psi. When I went to pull the cover I noticed it was sucked in. As soon as I loosened the first screw the cover sprung back up. I turned the pump back on and it starting working fine building up to the cut out of 60 psi
 
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Old 04-01-12, 01:36 PM
Q
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Jaytills thanks for the responce

so after pulling the pipes from the well again I did find debris in the venturi in the jet body. cleaned it out and was able to build pressure again the system is now running better than it has ever run since I have moved in.

on another note about the vacuum situation I have a similar set up except I have a huge concert lid but my well head is about 5' below grade. I don't know if your cap has a spot for one I can only assume it does since we replaced that as well and the new cap had 3 holes two for the well pipes and one slammer (maybe 1/2 in" threaded hole to which they provided a plug. since the old cap had a pipe approximately 3 ' and bent like an upside down J we just installed it the same way. this seems to me to be a fix for your vacuum situation.
 
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