Question about Flotec Corrosion Resistant Shallow Well Jet Pump 1/2HP, 8GPM

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Water pump My water pump runs and runs and won't build pressure in the holding tank. It only goes up to about 15 psi, and just runs.

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Try cleaning the jet.


water pump - 26a474b.jpg

Posted on Oct 24, 2009

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Replace the pressure switch. A black box attached to pump.

Posted on Jun 17, 2009

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2 Answers

What causes my booster pump to increase pressure even after I shut power and or water supply off?


something wrong here. your incoming pressure is 4 psi ( tank pressure to the pump and you use a pump to boost pressure to a maximum of 65 psi at which point the pump is shut off ( all taps close off)
yet with no pumps running the pressure goes up to 100 psi
Find where you are getting pressure in that is making the pump leak
if you have 100 psi to the pump when it is turned off, then it would not be turning on ( power on) as the shut off pressure is set at 65 psi and the line pressure is 100 psi

Sep 27, 2016 | Grundfos MQ3-45 1 HP Pressure Booster...

1 Answer

With only one adjustment *****, can't figure out how to adjust cut-in and cut-out levels.


There is only one adjustment screw because it has a fixed differential. A 20 lb differential is standard. I recommend a 40-60 pressure setting which gives you an average water press of 500 psi. With a 40 cut-in, your tank pressure should be set at 38 psi. There is a schrader valve at the top of the tank. Use a tire gauge to set it at 38 psi. Do that first. Now set your press switch by running water and observing at what pressure the pump kicks in at. Don't worry about the cut-out pressure. It's trial and error.
Let the pressure build up above 45 psi and then run water until you hear the pump kick on. Keep doing this until the pump kicks on at 40 psi. It may take a few tries, so I recommend having someone else turning the water on and off for you.

Apr 14, 2016 | Plumbing

1 Answer

We have a well and our water pressure keeps changing, from very low, to blasting... irregular, no pattern


You could have two problems. The first and most likely is that the pressure tank does not have a high enough pre-charge or the diaphragm has a leak. The pressure tank acts like a shock absorber for the well pump and pressure switch. When the water pressure drops the switch turns the well pump on. The pump runs until the pressure switch stops the pump. As the water pressure builds it pushes up on the diaphragm inside the pressure tank. If the pre-charge pressure is too low the system cycles less but the pressure fluctuates more. To fix this, the tank will have a valve on top that looks like a tire air valve. The tank pre-charge should be 30-35 psi. If your pressure switch is working properly, when the pump builds up the pressure about 15-20 psi more, the switch shuts the pump off. The pre-charge above the diaphragm pushes down and forces the water out to the tap.
If the pressure switch is set incorrectly the fluctuation may produce similar results. The pressure switch should be set to deliver adequate pressure and according to the well pumps working limits. Depending on the how far up the water has to be elevated to reach the highest shower head the more pressure is needed. The pressure switch has electrical contacts that could be burned and not releasing to stop the pump correctly. This should be checked by qualified service technician. Electricity and water don't play well together, add in a little carless good intent and you could have worse problems.
Get out the pressure gage and check the pre-charge, add air with a bike pump or a regulated compressor. If water spurts out of the air valve, the diaphragm has a leak. If the pressure is not the problem, call for service. This video has all the info you may need.
Components Of Typical Well Water System

May 22, 2014 | Plumbing

1 Answer

I have a new 1 hp utiltech pump and a new. Precharged tank with 34 psi in it now. When i prime the pump the pressure goes right to 25 psi and i can hear some water moving . When i open the shut off valve...


The 34 psi of the pressure tank sounds high, but it depends on what the cut-in pressure is set at in the pump pressure switch. Typically the pressure switch is for 20-40 psi or 30-50 psi. To establish what the pre-charge of tank should be , you need to establish what the pressure switch setting are (i.e 20 - 40 psi , etc.) Run the water and watch the pressure gauge and note at what pressure the pump comes on. The pressure tank needs to be pre charged 2 -4 psi below that cut-in pressure. So if the cut-in pressure is say 30 psi, then the tank needs to be pre charged to 28 psi.
To pre charge the pressure tank, turn the pump off. Drain the pressure tank of water to relieve all pressure in the tank. Then check the pressure of the tank at the air valve. Set the pressure to 2 psi below what the cut-in pressure is.
If you adjust the pressure switch, say from 20-40 to 30-50, you will need to go through the procedure of re adjusting the pressure in the tank. I hope this helps....

May 21, 2014 | Plumbing

1 Answer

Problem with pump?


The pump pressure switch should be checked to see what the ON-OFF pressure is set at. Typically the pressure switch is set for 20-40 psi, or 30-50 psi. The pressure tank should be purged as well. With the pump OFF, and the tank drained of water, the air valve on the tank should read approximately 2 psi below the "on pressure". So if the system operates at 20-40, the tank should be pre-charged to 18 psi. If water escapes from the air valve, the internal bladder in the tank is ruptured, and the tank needs to be replaced. A tire air gauge is used to measure the pressure in the tank after the water is emptied from the tank.. A tire air pump or a compressor is used to charge the tank. if a compressor is used, be careful not to over-inflate the tank, as this may cuase the bladder to rupture.

Apr 14, 2014 | Utilitech Plumbing

1 Answer

Pump not holding presure


If you have a bladder - type water pressure tank, it probably needs to be purged of air and then pre-charged to 18 psi. There may be directions on the side of the tank. Turn the water Pump off. Drain the tank of water. Check the pressure of the tank at the air valve on top of the tank. The pre-charged pressure of the bladder is set to 2 psi below the lower pressure set by the pressure switch, so in your case, the low end pressure is 20 psi. Therefore, the pre-charge pressure of the tank is 18 psi. If you set the pressure switch to operate at 30 -50 psi, then the pre-charge pressure would be 28psi., etc. Once the pre-charge pressure is set, turn the pump back on. ( don't forget to close the drain valve). The system should cycle normally. A tire gauge works to check the tank pressure. An air compressor may be used to charge the tank, but be careful not to over- inflate the bladder. A tire air pump may also be used. Hope this helps....

Apr 06, 2014 | Utilitech Plumbing

1 Answer

Gould j5s, pump not going above 15 - 20 psi, does this sound like it could be a priming issue or not since it is pumping some water?


how much pressure do you want with a 15 to 20 psi, really what are you pumping house water, you need more pressure to supply a home like a 60 psi with an exterol tank

Nov 18, 2013 | Jet Flo 04325143A Marine Heavy Duty Water...

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

I have a 1/2 hp sta-rite well pump that only produces about 40 psi through my pipes. The problem is that there is a 40/60 switch on it so it constantly runs because it doesn't build enough pressure to...


You probably have a bad pressure tank. The pressure tank bladder can develope a leak internally nad become saturated with water which won't allow it to provide cushion for the pump to gain and maintain pressure. It could also be that there is little or no pressure in the tank. Check your pressure and add to at least 40 psi. If this helps , but doesn't totally cure your problem, you have a bad tank.It could also possibly be a bad check valve but, you would probably lose all of your prime.

May 30, 2011 | Home

2 Answers

Ok at the place I am employed they have a 1 Hp submersible pump it pumps about 300 ft into the top of a 120 gal storage tank then the water comes out of the bottom of the tank and goes into our grundfos...


The booster should have been placed after you restrooms with a check valve to prevent back-pressure. then you can adjust both the sub-pump pressure, and the booster pressure accordingly
let me know

Dec 18, 2010 | Grundfos MQ3-45 1 HP Pressure Booster...

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