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Pump does not developed required pressure - Plumbing Pumps

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Not much information to go on---like what kind of pump is it and does the system have a relief valve? People replace good pumps to find out that the relief valve is bad and needs repair or replaced. But before I can give you additional help I need to know what type of pumping system you are having problems with.

Posted on Dec 13, 2008

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Pentax smart head


Check the pressure switch. Be sure you have enough water available. Check for a leak. What are you pumping. Is it pumping. I am not familiar with this pump so I am just listing some points to check. If it is a submersible well pump it can develop a lot of pressure.

Nov 29, 2013 | Plumbing Pumps

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I have a 4 year old model WGP 95 pump which has been running trouble free until a few weeks ago since when it has developed a recurring earth leakage problem which seems to make no sense. When operating...


I assume the RCD is an overload protection device. I would check the pressure side of your system and be sure it is clean. It sounds like it is building up back pressure. and overloading the pump motor.

Aug 14, 2013 | Little Giant Plumbing Pumps

1 Answer

My 3/4 hp shuts off and on roughly every 2 or 3 seconds when using. i pumped some air into the pressure tank and it worked much better. but i pumped in a little more and now its every second. i'm...


The switch is not the problem. The problem is the pressure tank. I am assuming you have a captive air tank with a bladder in it. The air pressure in the tank needs to be 2 lbs below the turn on pressure. Heres how to acheive that. Look at the pressure gauge on the pump and determine what pressure the pump is turning on. Next, turn the pump off and drain the pressure tank, then shut off the water to the whole house. If the pressure tank does not drain all the way, then you have a problem with the bladder in the tank. Once the tank is drained put the required amount of air in the tank. (if the pump turned on at 30 psi, then put 28 psi in the tank and if the pump turned on at 20, then put 18 psi in the tank) Check it with a tire gauge to confirm. Now turn the pump back on and see how it does. If done properly, your problem should be fixed. If it is a bad bladder, you will have to buy a new pressure tank.

May 20, 2011 | Flotec Plumbing Pumps

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I have a grundfos mq 35 pump to boost pressure in my hot and cold system. due to loss of water recently pump ran dry and shut down. when water returned the system was restarted and pump reset. we now get...


There was possibly some damage done to the pump while it was operating dry and it in now not able to deliver the required flow of water. Pumps wear very quickly when allowed to run dry, even for a short time.

Jan 02, 2011 | Grundfos JPS4 1 HP Pressure Booster Pump

1 Answer

Annovi reverberi triplex preesure washer pump


Usually when a pressure washer is pulsating, either one or more pistions are not pumping. Quite often one of the check vavles for a cylider has broken and will not seal, which means you'v just lost one cylinder, and now you're running on two (etc) If a pressure washer is allowed to idle too long, re-circulating the water, it will get hot, and then melt the plastic container on the check valves. Go to : www. pressure-washer-parts.com You can order parts, and manuals.

Jul 15, 2010 | Annovi Reverberi 4000psi 4gpm Pressure...

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My well keeps running i replace the pressure switch and the well starts working properly this happens every 6 months i have replaced the well , jet , and bladder tank why does this keep going on


by keeps running I assume that the presure switch doesn't cut out at the desired pressure and replacing the pressure switch solves the problem probably the contacts in the pressure switch are becoming welded if it worked for years and then this just started then if the pump has a capacitor start ( box inside the house between the pressure switch and the pump wires) you may want to cosider replacing that component and well your poking around verify that the rating of the pressure switch matches your pump requirements amps volts ect..
Good Luck

Oct 08, 2009 | Plumbing Pumps

1 Answer

How best to install 3.5 atmosphere water pump to drive shower, bath, toilet and wash basin to two bathrooms, particularly connections to cold and hot water supplies?


Typically a water pump or booster pump would be placed on the main water feed (this assumes this line feeds not only the main cold line but the hot water system too. I work heavily with booster systems and would ask for futher information. Is this system runing off of a pressure switch such as starting a lower pressure and will shut down at a higher pressure or is it a constant pressure system where as the pump is expected to slow down or speed up to met demands? Either way the system will require a pressure tank, the first method of running will require a larger tank. With regadrs to connection this could be sweat in (with copper) or the use of mechanical connections. A proper "spring loaded" check valve would be required too.
I hope this may have helped,
Tom

Sep 21, 2009 | Plumbing Pumps

1 Answer

Ive got a shallow jet pump model sd510 it runs all the time and it pumps the water from our holding tank to sump pit it runs about 250-300 gallons through to the sump pit ive replaced the pressure switch...


Just curious, why do yo9ur run water from a tank to a pit?

Where is the pressure switch located? At the pump I presume? What will increase the pressure? If you are pumping to an open pit, you will never build up any pressure? What is supposed to restrict the pump to create pressure?

You need a restriction to create pressure to turn off the pump. Is there a float valve like in your toilet in the pit? If not this would be required

Good Luck

Jan 04, 2009 | Plumbing Pumps

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