Sprinkler system pump won't stay primed

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Old 10-10-19, 10:34 AM
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Sprinkler system pump won't stay primed

After a replacing a broken fitting on a lake fed sprinkler system the system won't stay primed. We installed a new pump and installed a new check valve within a few feet of the the water intake point. There is about 50' of pipe from the pump to the lake and then another 30' of pipe underwater to the intake. The pump requires 1/2 gallon of water every time to get re-primed and loses this amount within an hour but never more than that. Does the amount of water lost give me a hint on where the leak is occuring?
 
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Old 10-10-19, 11:10 AM
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Welcome to the forums.

The job of the check valve is to keep the suction line primed.
It sounds like it's not sealing 100%.
 
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Old 10-10-19, 02:43 PM
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Thanks Pete . I still question though with the check valve more than 50 feet away from the pump, why doesn't the intake line drain all the way between pump and valve if the leak is with the valve. If I am losing only 1/2 gallon of water no matter how long it sits doesn't that indicate that the leak is very close to the pump intake? It seems to me that the leak must be right at the pump but I can't find any water coming out there.
 
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Old 10-10-19, 03:18 PM
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You definitely have a mystery here.

I am not sure that you would see water on the outside of the hoses etc.
What if it is sucking air in?
So the check valve does it job but when the pump shuts off the weight of the water in the hose causes a negative pressure in the hose and sucks air in.
 
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Old 10-11-19, 12:56 AM
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You wouldn't see any water leaking on the suction side of a system. It would just draw air in.
By leaking I mean the actual valve itself..... internally.

Since it only uses a specific amount of water every time.... it sounds like it needs that much water
before the valve actually closes off. Maybe a different brand of valve should be tried.
 
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Old 10-11-19, 04:17 AM
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Look for a crack in suction line a few feet down stream in pipe. A small crack or pin hole down stream could cause this. Think there would be a small puddle there.
 
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