Question about Craftsman Professional 3/4 hp Hydro-Glass Shallow Well Jet Pump

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Well jet pump won't build pressure

My drinking water swell pump will pump water but won't build pressure even with all valves off and pump is only pumping into the tank

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SOURCE: water pump keeps on running my mastercraft jet

yOU NEED A FLOAT SWItch to have the pump work unattended. I have two new switches and no use for them, Where are you?

Posted on May 26, 2010


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I have a pump at cabin it pumps water but won t build up pressure and shut off got this pump 7 years first problem

Normally there is a pressure TANK, used in conjunction with a Booster pump. Do you have one on this system? That's where the pressure is stored. If no pressure, the bladder is either failing or has failed.

Mar 07, 2015 | Goulds Pumps Goulds 1 Shallow Well Jet...

1 Answer

Not enough suction

It sounds like it is a jet pump in a deep well. You probably will have to pull the foot valve and clean or replace it. Because of cost I would suggest getting a qualified repair person to check it out.

Jan 23, 2014 | Flotec Plumbing

2 Answers

I have a flotec 1 hp pump. Wife washed 3 loads of clothes in a row and noticed we run out of water a while later. I shut pump off and noticed pressure tank low on air. I put 18 lb. air in tank and...

If in the past your system can build-up pressure up to 40 psi even if the supply valve is open and water is being used in your house, then your pump impeller maybe already worn out that's why its pumping capacity was reduced.

Nov 12, 2012 | Flotec Corrosion Resistant Shallow Well...

1 Answer

My jet pump has a 20 - 40 pressure switch but won't give any more than 30 psi. Whats wrong?

There are several causes for this to occur.
1. If it is a 20-40 switch right out of the box it may not be set correctly. I have had this happen. If it builds to 30psi and shuts right off without straining to build to 40psi adjust the Cut-Out pressure up to 40psi. There are two different adjustments on a well switch. One for Cut In / Cut Out psi and one for Cut Out psi.
2. Lack of head pressure being built by the pump can be the cause. This can be attributed to the wrong Jetting in the pump. IE: A shallow well jet/venturi on a deep well.
3. The pump may have a bad impeller, but the pump will generally really strain to build pressure and a bad impeller will be loud, like grinding at times.
4. Double check the pre-set pressure in bladder tank also.

May 28, 2011 | Fairbanks Ace 1 Horsepower Convertible...

1 Answer

I can hear water surge back through the jet pump when it cycles off. Check valve is new, getting plenty of flow, cycles on and off properly. Everything is normal except the short burst of water back...

If it is taking longer than normal to build pressure at the pump and the check valve is good, the pump may be sucking some air, consequently the sound. This could be caused by problem with well and/or pump impeller. I would double check that check valve, it may be bad.
Let us know how else we can help,

May 26, 2011 | Jet Plumbing

1 Answer

My water pump kicks on every 30 min or so even if there is no water used

When a pump goes on and off there is a water leak somewhere.
There should be a gauge. Let the pump build up pressure and watch the gauge.
The pressure will probably be dropping. This means that water is going somewhere. The leak could be anywhere that you use water, sprinklers, sinks, hose lines. If there is a valve above or near the pump, shut that valve and see if the pressure stops dropping. If the pressure stays up and the pump stops cycling on and off, the leak in in the pressure piping somewhere, you must locate it and repair it.
If the pressure continues to drop even with the discharge valve shut, the water must be leaking back into the well. There is a check valve somewhere on your line between the well and the pump. If this check valve is leaking, pressure will drop and the pump will come on to restore it.

If it is possible to shut off the discharge of the pump, shut that valve and watch the pressure gauge to see if it is dropping.

Dec 12, 2010 | RTO Wayne 1/2 Hp Shallow Well Jet Pump

1 Answer

We lost water pressure, overnight. Our well's jet pump keeps running. No pressure builds up in tank (< 15 PSI). The switch for the pump DOES NOT shut the pump off like it has in the past (very odd). ...

check the voltage to the well pump if it is correct then you know you have correct power to it if you don't them the pump control has a issue and will need to be services as to other possible issues take the pipe off the top of the well head and run the pump if you get a good flow out of the pipe then chances are your pump is ok attach a shut off valve to the pipe and slowly close but not all the way see it it builds pressure if this is ok check the pressure tank if you have one. these have a bladder inside that allows the water to be at a constant pressure it will be a small tank depending on your set up you have.
on the top of it their should be a small valve like a tire valve stem use a tire Gage and check the pressure if their is none look on the tank it will state what it should be.
add air to the setting stated. if pressure will not build or water comes out then the batter is bad inside and will need replacement some you can do just the bladder others you have to replace the unit what this unit does is when you use the water the tank supplies the house pressure till is get to a point then the pump will start and charge the system.
if it is bad the pump will keep running trying to maintain the pressure and over heats witch will heat the breaker the breaker should not be hot a slight warm to the touch only. and can total the pump.
if when you apply power to the pump if no water or the pressure don't build with the valve then you will need to pull the pump and have it serviced at same time have the well checked to see if it collapsed or water table dropped then it may have to be drilled deeper. all ways be careful playing with power and water take the right safety precautions. when disconnecting the pipe to test for flow don't do it right at the top of the well head you can drop the pump then your in a world of hurt do it down the line some like toads or at the pressure vessel not after that you want to isolate the issues with each unit it will be less hassle and nor as expensive . these are the exact steps a well driller would to to check but charge you a ton.
i hope this helps

Aug 31, 2010 | Jet Plumbing

1 Answer

We have a well that has recently lost all water pressure. We have now replaced the points, the switch, the valves, and the pipe from the pump to the tank. We have bypassed the underground piping to see if...

What kind of pump is it? If it is a jet pump, it may need to be primed or the foot valve in the well could be blocked with rust or dirt. On a shallow well or jet pump, check it for suction side leaks. turn it off, and see if water seeps out of any of the joints. A small amount of air seeping in will make the pump airbound and keep it from building pressure.

Mar 07, 2010 | Plumbing

1 Answer

No pressure on gauge,pool is filtering but on off,cell tube fills up with water then emptys then fills up again

you aren't getting a good suction. Try placing your hand over the jet or jets going into your pool as to build up the pressure once again. Gradually allow the water to flow out of the jet(s) as you feel the pressure building up again. As of current you pump is just allowing the water to flow right through instead of sucking with force and pumping with force. No issues with filter or pump. Just need to restore proper suction/pumping

Oct 11, 2009 | Pool & Spa

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