Shallow well/jet pump cycling


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Old 04-14-16, 01:30 PM
J
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Shallow well/jet pump cycling

I just closed on a new (old) house and have some well issues. I have a 1/2hp Wayne shallow well jet pump on a 20 gallon plain tank. No bladder. No pressure gauge, but a 30/50 switch on the pump.

Pump cycles on after about 1/2 gallon water draw. Runs for about 12 seconds and shuts off. (My math tells me the pump is producing about 2.5 gpm.) The well is a driven point 24 feet down. I'm not certain where the SWL is. I'm guessing about 15 feet.

So far I've replaced the AVC, and I've drained the tank a couple times to try to make sure it isn't waterlogged. Pump still cycles on after about 1/2 gallon draw.

So it seems I have two problems. The first is that the pump shouldn't be cycling so often. The second is that I should be getting a higher flow (unless SWL is near the bottom of the well). Trying to solve the cycling problem first. Since I replaced the AVC and saw no change, all I can think is that there is a leak in the supply pipe somewhere and I am drawing air in the line, and hence the tank, every time the pump turns on, which is why I have essentially no usable volume in the tank. Any other ideas? Bad pressure switch? Cavitating pump? I'm considering replacing the plain tank with a 20 gallon bladder tank, but if I have an air leak in the supply pipe will I still end up with the same problem? What happens in a driven point well if the pump is trying to draw water faster than water can come through the screen? Does that add air to the system too?

Any suggestions appreciated.
 
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Old 04-14-16, 06:23 PM
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I'm considering replacing the plain tank with a 20 gallon bladder tank,
That's where I'd start.

I'm not all that big on the AVC (auto vent control) float systems.
 
 

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