Anybody know about Myers jet pumps?

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wvr3635

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Hi, I'm a new poster, I'm a handyman at a prep school. I was hired as a carpenter but 90% of my day is plumbing, and 100% of my weekend calls, as was the case today. I was called in as the local rental house had no water. As I arrived I noticed the pump running but not pumping water. I knew this was bad news right off the bat. The pump is an old Myers pump. In 11 years I've never had to work on it, it was that reliable. I took the top primer plug out and added water, that didn't work. I took the regulator out, it was completely closed. There seemed to be a lot of mud and gunk in it. We went to town for a new one only to find this is an old and seemingly obsolete part. The problem is now deferred to Monday as I have a host of questions to answer. The problem is either:
-A lack of water at the spring coming into the pump,
-A recent storm stopped up the spring/pump intake,
-The regulator stopped up causing the pump to run the spring dry,
-The pressure switch is bad causing the pump to run the spring dry,
-The pump impeller is bad.
Another question I have concerns Myers pumps--why does this pump have two pipes on the intake? Is one of them a drain-back, like a furnace pump? If I blow back into the spring to unstop the pipe, which pipe would I use, the bigger or the smaller? If I need a new pump with only 1 intake, what do I do with the extra pipe?
 
Two pipe pumps known as two pipe jets are deep well systems. This means there is a jet at the end of those two pipes. Shallow well jet pumps can only lift water vertically 25 feet. Deep well jet pumps can go as deep as 150 feet or so but are poor performers. The jet could be plugged, but you should still have about 28 lbs or so. If the impeller nuked, it won't move water at all. To check that, leave the prime plug out, fill the pump with water, start it up and see if the water in the prime hole moves at all. Don't stare at it from up close, cause if the impeller is still good, your going to get wet. If the pump did get hot, and didn't nuke the impeller, it could have still shrunk PVC fittings and caused an air leak.
 

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