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Myers hydro pneumatic water pump (Model: MPD 20; Serial: D99735381) is cycling between 30 PSI and 70 PSI. Seems to hit 70 PSI, click and drop back down to 30 PSI. Then the cycle starts again.

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 60 Answers

SOURCE: Problem with Convertible Jet Pump 3/4HP RedLion -

If I understand you correctly this is what you have:

- A pump that draws water from a lake 300 feet from lake to your cabin (I assume the pump is at the cabin)

- The pump kicks on to maintain pressure in a tank that distributes water to faucets in the cabin. The pump only turns on to pressurize the tank when water is being used (I am assuming).

- When you turn on tap, pressure in the pressure tank drops to 30 psi, then you hear water sucking from the tank to tap and flow stops at tap. Then the pump finally kicks back on and pressures tank to 23 psi.

- The pump is not used regularly.

If water flow stops when the pressure tank is reading 25 psi, then likely the real pressure is 0 psi and pressure gauge is reading wrong. If this gauge is tied into a switch that starts and stops the pump, then this is probably your problem. You may have partial blockage in your pressure gauge/switch that is causing gauge to move too slowly to keep up with the actual pressure changes when water is being used. Ore the pressure gauge/switch may be broken. Pressure gauges are notorious for reading pressure when there is none. If you can unplug the pump and disconnect the pressure gauge/switch and check for blockage in the ports you should start there. You mentioned that this worked good for the last two summers, if if sits unused for long periods, it could promote bio-growth, rust and/or sediment in the connection to the pressure gauge. If you find blockage, remove it and flush it out. Reinstall the pressure gauge/switch and try it again.

One other possibility is clogged strainer(s) / filter(s) in the water lines. It would not hurt to pull and check/clean any strainers / filters in the system including before the pump. I would even check at the lake for a strainer where the water enters the suction line to the cabin.


I would not assume that the pump is the problem yet.

Hope this helps.


Posted on May 01, 2010

  • 49 Answers

SOURCE: Westinghouse Washing Machine Model LF700B

the thermistor (witch senses water temp) is most likely faulty and needs replacing

Posted on Feb 19, 2008

  • 2 Answers

SOURCE: Pump no longer starts

It sounds like the float didn't come down because of dried debris on the rod,or the hinge where the lever goes up and down depending on how your pump works.check for water in the float,too...Hope this helps...1nglen

Posted on May 23, 2009

  • 1 Answer

SOURCE: Pressure Washer Pump and Engine Stops Suddenly

The pump might be binding against the motor, causing the pump to overheat and temporarilly "seize up" and shut the engine off.
After cooling down for a brief period (5~10 mins) the engine can usually be re-started, but the overheating problem will keep coming back.

This happens when the pump either wasn't seated against the engine properly during it's initial instalation, or the pump housing wasn't machined properly and the PTO shaft is trying to drive the pump at a slight angle = excessive friction = overheating.

Try this:
1) Loosen the bolts that mount the pump to the engine just enough so that the pump can be wiggled slightly.
2) With the engine power switch in the "OFF" position, slowly pull the recoil starter rope so that the engine / pump completes about two revolutions. This helps to align the pump surface with the engine.
3) Lightly snug the pump mounting bolts in a criss-cross pattern, then slowly pull the recoil starter rope again to ensure that the pump isn't binding.
4) Finish tightening the pump mounting bolts in the criss-cross pattern (approx. 21 foot pounds torque).

The entire process should take you roughly about 10 mins from start to finish.

If this doesn't remedy your problem, then try running the engine for 20 mins with the pump COMPLETELY removed so as to isolate the components.

Posted on Sep 01, 2009

  • 54 Answers

SOURCE: Our pump continuously cycles everytime we flush

You have a water logged pressure tank. Replace

Posted on Sep 26, 2009

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1 Answer

Working pressure


Putting 60 lbs. of pressure in the pressure tank is not the answer.

First determine that the pump is working correctly, Open the drain valve and see if you get a good flow of water. If you do then OK, the pump is working. If you are not getting a good water flow from the drain valve, then the pump is not operating correctly - maybe a bad foot valve. Next open the drain valve and watch the water pressure gauge, and note at what pressure the pump kicks on ( that's the cut-in pressure), and when it kicks off ( that's the cut-out pressure). Most pumps are set to operate at 20-40 psi, or 30-50 psi. The cut-in and cut-out pressure is set by the water pressure switch.The pressure in the water tank has to be set 2 psi BELOW the cut-in pressure of the pump. That is, if the pump has a 20-40 psi differential, then the tank has to be pre-charged to 18 psi.

To pre- charge the pressure tank , the pump has to be shut off. The Tank needs to be emptied (drained ) of water. The air pressure is then set to 2 psi BELOW the cut-in pressure. If water escapes from the air valve, the bladder in the tank is ruptured, and a new tank needs to be installed.

So, first make sure the pump is working.
I WOULD RELIEVE MOST OF THE PRESSURE IN THE PRESSURE TANK TO ABOUT 20 PSI BEFORE CHECKING THE PUMP, AND PRCEEDING WITH THE PRE-CHARGE OF THE TANK.

May 24, 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

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

2 Answers

How does pressure tanks work


Pressure tanks do just that in a water system. They create pressure for water to flow when the water pump is on the off cycle. A manifold is plumbed into the tank from the main line coming from the well. The main water line continues to the house plumbing from the manifold. So it's line from pump to manifold - to tank, and from manifold to main into house. The manifold also has tappings for the pressure gauge and the pressure switch. The pressure tank creates water pressure. The water does not flow through the tank. Pressure tanks also have to be 'tuned' or adjusted to the low end pressure set by the pressure switch. Actually the tank pressure needs to be set 2psi below the low end pressure. Most residential water systems are set to operate between 20 -40, or 30-50 psi, which is set by the pressure switch, which in turn , turns the water pump on and off. So if a system operates between 20 and 40 psi, the pre-charged pressure of the tank should be 18 psi. Pre-charged means the tank is drained of water with the water pump OFF. The tank pressure is then checked adjusted by way of the air valve on top of the tank ( A tire gauge works). Pressure tank mainfolds are a common plumbing part.

Mar 19, 2014 | Utilitech 20-Gallon Vertical Pressure Tank...

1 Answer

I have a square D pressure switch on my home well water system. I also have a Iron filter on the system. The problem I have is that when Iron remover is in it's backwash cycle at night and someone uses the...


I find it interesting that you never had this problem. Did something change, specifically on the backwash of the iron filter? Is is possible that there is lower restriction to backwash causing the lower pump pressure? Could you throttle the backwash flow to allow pressure to be maintained and still get adequate backwashing?
It seems a lot of water must be flowing so that when you use some water the pressure drops to more than 10 psi below cut-in, that means typically 30 psi shutoff point.
Can you lower cut-in pressure, say 5 psi, lower?

Jan 05, 2011 | Square D 9013gsg2s22j99r Pressure Switch

1 Answer

My pump comes on and presurizes about every 20 to 30 minutes when there is not water being used in the house. If I shut the valve off from the pump to the storage tank the tank will stay presurized and...


It sounds like the check valve not holding. If there are no signs of any wetness from a leak the check valve in the pump ,seems to be letting water leak back in well.

May 14, 2010 | Plumbing

1 Answer

Continuos pumping


Continuos pumping is associated with waterlogged
pressurized system. To correct it, do this steps.
1. Put the power line off.
2. Drain all the water inside the pressure tank by
taking off the plug at the bottom. Then replace and
close the drain plug.
3. Open the priming port plug and fill it full with water.
Replace the priming port plug.
4. Close the flow control valve to regulate water output
5. Put the power back on, and start the pump.
6, Slowly open the flow control valve until the water
stabilizes at 20 or 30 psi at the pressure gage..
7. Set the pressure switch to stop at 40 psi and
start at 20 or 30 psi.
This will solve your problem.

Oct 15, 2009 | Plumbing

3 Answers

Flotec 42 gallon water tank - short cycling and changing water stream...do I need a new tank or could it be another problem?


These holding tanks are pre charged with air which in turn pressurizes the water. The tank has a bladder and an air valve on top. The pre charge ,over time, loses pressure, and the tank has to be pressurized again.
  • The well pump needs to be turned off.
  • The water has to be drained from the tank
  • Air is put into the tank from the air valve on top of the tank, and is measured with a tire air gauge.
  • The pre charge pressure is set to two psi below the pump cut in pressure.
  • In other words if your pump kicks on at 30 psi, the pre charge pressure is set at 28 psi. If the pump kicks in at 20 psi, the pre charge is set at 18psi, etc.
  • After you pressurize the tank, turn water back on.
  • If water comes out of air valve on top of tank, then the bladder is ruptured and you need a new tank.
  • Hope this helps!

Jul 06, 2009 | Flotec Corrosion Resistant Shallow Well...

1 Answer

Low pressuere motor pump when i plug the vacumm drop 30 to 5psi


if your filter pressure is 30 psi it needs to be backwashed! Reson pressure drops when hooking up vacuum cleaner is reduced water flow will drop pressure

May 15, 2009 | Pentair 1.0 Hp Whisperflo Pump

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