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My fresh water pump's suction poor - Pool & Spa

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Check the lintpot on the pump.. look in there and see if debris is blocking the impeller opening..see if any pipes to it are blocked up or if its sucking air anywhere..

Posted on Jan 09, 2014

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Freshwater tank fills and overflows even though selector is pointed at 'city water' position.


Other than a leaking 4 way selector valve the probable cause would be a leaking check valve in the pump.

On the RV the city water and discharge from the fresh water pump are tied together. When on city water the discharge of the pump will have city water pressure on it. If the internal check valve on the pump is leaking, water will flow through the pump backwards and into your fresh water tank.

Typically this requires ether replacing the pump or installing a secondary check valve between the fresh water tank and the pump suction.

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My pump is running and water is returning to the pool but there is no suction.


Are you saying there is 'no suction' or there is 'little suction'? If your pump is running and water is going back to the pool, that water is coming from somewhere ... probably being pulled from the pool. Is this a new pool? If not, did it operate properly last year? Are you getting air into your system?

You don't say much about your pool ... is the suction line attrached to a skimmer? Two skimmers? Two skimmers and a bottom drain? Attached to the bottom drain? I don't understand why you are reporting no suction since there is a discharge ... Is this pool in the ground or above ground? Do you have one circulator pump or do you have multiple pumps? If you have two skimmers and are trying to vacuum, close the shutter on the other skimmer or put a plug into it. Make sure the plug is the proper size, you don't want to get the plug pulled into the system!

Perhaps there is not enough suction for you to vacuum? If your suction is attached to several points in your pool, can you cut back on the other ports? For example, if you are drawing from the bottom and a skimmer, can you shut the bottom drain off?

Have you checked your impeller for hair clogging? What about your filter, if sand, have you back washed? What is your discharge pressure? If DE, how is the DE doing? Might it be due for a change? If a cartridge filter, is your cartridge clean? Of course dirty filters will cause high pressure and poor flow of water. If your impeller is clogged with hair, that will impede the flow of water.

Fill in some of thedetails and I will continue to try to assist you. Thank you for your interest in FixYa.com

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1 Answer

Cannot get pump to prime


If this is a water pump it sounds like there is air in the line. If this is a domestic water pump there might be a broken suction line or the fittings might be sucking air, This is only one problem. It might also be a bad pump but not being there it is hard for me to say exactly what it is. If you could borrow another pump and hook that up and try it it would be a good test to see if it is fact a broken suction line or a fitting or just the pump. If you are usig a plastic suction line it helps if you heat it when you go to tighten up the hose clamps that clamp the line to the inlet of the pump. Less chance of air because of a poorly tightened fitting. From experience i know priming a pump can be frustrating at times but it takes patience and a bit of work to find out why it won't pump.

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1 Answer

Pump don't work property


This kind of pump uses an impeller (like a fan). If you test the suction when it is running dry (that is, you are just pumping air) then the amount of suction that an impeller can create is pretty small. However, if the pump is pumping water, and you put your finger over the inlet hose (while it's under water) you should feel a great deal of suction. If the problem is that you have clog on the output side of the pump, you will still feel plenty of suction when pumping water. However, if there is a problem with the impeller (like maybe the blades are broken off or worn down) then you won't feel much suction, even under water. I hope you find this helpful. Al Kupchella

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Dishwasher won't pump water to wash, but pumps water out


its most likely a open/close solenoid to allow fresh water hot and cold in. the suction pump sounds like its working

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I have a Sta-Rite Max-E-Glas II (1.5hp) Pool pump and a Hayward Navigator sweep. The sweep was working then stopped. Pulled it apart found bad bearings replaced them. Ran sweep again worked at first...


Is the pump leaking water? If you lost the prime or are having trouble priming then there would be an air leak somewhere on the suction side of the pump. Poor suction would interfere with the sweep. One way to ell if the pump or suction line(s) are leaking is to examine the inlet basket once the pump is primed. Any air left in there after a few minutes of operation once primed would indicate a leak in the suction/pump.

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Take out the pump pot basket and stick your finger in the hole towards the motor (make sure the motor won't kick on!!). What you should feel is the impeller. It has five grooves in the face of it and each one needs to be cleaned of foilage and debris. With every hole clogged in the impeller you lose 20% of your motors effeciency. With whisperflow brand the pump pot basket is poorly designed where debris like pine needles go straight through.

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1 Answer

Poor suction


i had the same problem and moter cutout for over heating.i removed everything removable to see blockages i found a ball point pen and wood shavings.i cleaned every part possible including the rubber gaskets.also cleaned the bubber gasket in the waste bin.[mine is a 07] still poor suction. i removed side filter washed it in "warm water" and washing up liquid[dyson say to use cold water] the rinsed out in cold water,left the filter over night on a news paper nr the radiator. problem solved..fantastic suction and no over heating.hope this will help

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