Grundfos MQ3-35  3/4 HP Pressure Booster Pump  Logo

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Posted on Jan 16, 2010
Answered by a Fixya Expert

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Air lock in water pump

Water turned off at mains, when water reinstated, pumps will not activate

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  • Expert 79 Answers
  • Posted on Jan 17, 2010
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Joined: Jan 15, 2010
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You need to bleed off the air. There should be a bleed port on the housing to do this. If that does not solve the pump coming back on, it could be air in the pressure switch.

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1helpful
1answer

My pool pump works great until I turn the Polaris PB4 60 on. They are both on the same water line. After 15 minutes the pump overloads and shuts down. The voltage is 240. Wired correctly.

I'm not sure which pump fails after 15 minutes. Is it the main pump or the booster pump? The main pump works fine but when the booster pump is activated, one of them fails. What happens if you leave the main pump on and only activate the booster pump? Will the booster pump run indefinitely as well? They both share the same supply line. What have you checked so far? How old are both pumps?Do you pumps sound normal? Do the pump motors get abnormally hot? Any recent repairs or new symptoms? Is there a shut off valve on the supply line that has been turned/moved? Please write back with more information.
0helpful
1answer

MY HOT TUB WAS READING ICE A FEW MONTHS AGO NOW ITS READING DRY I USED A VAX HOOVER DOWN THE FILTER COULD I HAVE CAUSED A PROBLEM

ICE is an issue with the cold water temperature. I'm guessing that you filled the spa with cold water, or turned the spa off and the water cooled right down. In ICE mode, the spa turns on the pumps and keeps running until it's satisfied that the water is not going to freeze, this can take some time.

DRY is an error that occurs when there's insufficient water in the heater, or a lack of water flow through the heater. This is commonly caused by either an air lock, a low water level, or a problem with the pump.

Is the pump circulating the water through the heater as per usual? If not, can you hear the pump running? If the pump is running but there's no water flow then suspect an air lock.

To remove an air lock, you can slightly loosen the pump union, or heater union to release air from within the system, much like when you have to bleed a radiator. As soon as water starts to come out of the union tighten it again. If you have an air lock you should hear the air escaping from the union prior to the water starting to leak out. If you heard air, that's great, try the spa again.
Apr 17, 2017 • Pool & Spa
1helpful
1answer

Pump has started making gurgling sound

You may have an air lock try using machine on and off 5seconds each time sow that you give the pump time to regain the water.
If not try and inject water your self from the rare instead of water tank some time when you get air lock it is removed alone by just simply leave it over night after you had tryed the water pump because the air lock is removed alone slowly.
0helpful
1answer

I have an air leak in intake line

Question:

What do I do if my pool/spa pump is loosing suction or prime?

Answer: by Osko Pool n Spa Pool Pump Losing Suction or Prime If your Swimming Pools Filter system looses Prime, it is caused by one of the following conditions.
Note: The lost of suction/prime is caused a leak which in turn sucks air into the system. The lost of suction/prime will be anywhere from the Main Pool Skimmer(s) to the Pool Pump. It will NOT be from the Pool Pump to the Pools Main Return(s).
1) First make sure that your water level is high enough so that the skimmer is not sucking air.
2) Check the Pump Pot Housing Lid Seal and be certain that its completely sealing and is not
Sucking air into the system. Check the lid for cracks. If either condition is true, replace the Pump Pot Lid Seal and/or entire lid
3) Check all fittings, clamps and hoses from the pools skimmer to the Pools Pump Pot Housing for wear, tightness and leaks.
4) Check Pool Pump Pot Housing for cracks.
If everything aforementioned in good working order, the next thing to check is the Pump Pot Housing Main Seal and the Pumps Impeller and finally the pump.

5) While the Pool Pump Motor is running, carefully inspect the area where the Pump Pot Housing attaches to the Pump Motor. See if there is any water leaking. Next, spray the area with water and see if the water is sucked into the Housing. If so, your Main Seal is damaged.
6) Disassemble the front half of the Pump Pot Housing from the back half and inspect the Pump Motor Impeller. (This is a high suspect part). See if there is any sign of wear or breakage. (This happens over time from debris in the water passing over the impeller). If so, your Impeller is damaged.
7) Re-inspect the Pump Pot Housing Main Seal by standing the partially disassembled upright, with the Pump Motor towards the ground. Pour water over the impeller and into the cavity. See if the water leaks thru to the outside of the Pump Pot Housing. If so, your Main Seal is damaged.
8) Remove the cover from the rear of the Pump Motor. Using a large standard blade, (straight), screwdriver or wrench... turn the main motor shaft. Listen for grinding and/or rumbling and feel for any restrictions while turning. If you hear or feel either, your bearings and/or brushes are damaged.
If everything seems to be in good working order, then you need a new pump... not just replacement parts
For more FREE DIY Faqs, go to:http://www.oskopoolnspa.com/index.php?main_page=faqs_all

For more FREE DIY Faqs, go to:
http://www.oskopoolnspa.com/index.php?main_page=faqs_all
0helpful
1answer
0helpful
1answer

We have a whirlpool bathtub. The pump is running but it won't take in any air and the jets aren't putting out any water. Do you know what the problem might be?

Is the pump running or just humming? If it is running and you do not have water flow then you may have an air lock in your system.The way to solve the air lock is to fill the tub with water and turn on the pump. Once you have done that then loosen the pump union on the top of the pump (discharge) until you get some water coming out. If that was the problem then the jets will start churning out water
Feb 09, 2011 • Home
0helpful
2answers

My cadillac eldorado etc 98 model needs a water pump pulley i can not find it anywhere does it go by any other name it is over heating and a we called a mech friend and he said it was the water pump and...

The water pump should come with a pulley on it or at least transfer over to the new one if it doesn't come with a pulley. Water Pump Removal and Installation All Engines To Remove:
  1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section.
  2. Remove or disconnect the following:
    • Coolant into a suitable container
    • Upper filler panel
    • Air cleaner assembly
    • Secondary AIR injection control valve gm_car_cad_sev_wtr_pmp_belt_shld.gif

    • Oil level indicator tube nut
    • Water pump belt shield fasteners
    • Water pump belt shield gm_car_cad_sev_wtr_pmp_drv_belt.gif

    • Water pump drive belt (D) gm_car_cad_sev_rad_outl_hos.gif

    • Radiator outlet hose from the thermostat housing gm_car_cad_sev_wtr_pmp_and_covr.gif

    • Water pump cover bolts
    • Water pump cover
    • Heater return hose
    gm_car_cad_sev_wtr_pmp_pulr.gif

  3. Position suitable water pump puller/installer tool (or special service tool J38816-A) to the water pump locking ears.
  4. Fasten the support plate to the water housing crossover to ensure proper engagement of the tool to the water pump locking ears.
  5. Remove or disconnect the following:
    • Pump from the housing:
      1. Use suitable water pump puller/installer tool (or special service tool J38816-A) to turn the pump clockwise
    • Support plate from the water housing crossover gm_car_cad_sev_wtr_pmp_rem.gif

    • Water pump
    • Seal from the water crossover
  6. Clean the sealing surfaces of the water housing crossover and the pump cover.
  7. Clean and inspect the water pump.
To Install:
  1. Install or connect the following:
    • Seal into the recessed portion of the water crossover
    gm_car_cad_sev_wtr_pmp_crosovr_seal.gif

    NOTE: The notched locking ear must be in the 7 o'clock position.
  2. Index the water pumps locking ears with the tangs in the water crossover.
  3. Position suitable water pump puller/installer tool (or special service tool J38816-A) to the water pump locking ears.
  4. Fasten the support plate to the water housing crossover to ensure proper engagement of the tool to the water pump locking ears.
  5. Turn suitable water pump puller/installer tool (or special service tool J38816-A) counterclockwise.
  6. Torque the water pump
    • Torque to: 74 ft. lbs. (100 Nm)
  7. Remove the support plate from the water housing crossover.
  8. Install or connect the following:
    • Water pump cover to the heater return hose
    • Water pump cover to the water housing crossover
    • Water pump cover bolts
      1. Torque to 89 inch. lbs. (10 Nm)
    • Radiator outlet hose to the thermostat housing
    • Water pump drive belt
  9. Place the water pump belt shield in position.
  10. Install or connect the following:
    • Water pump belt shield fasteners
      1. Torque to 89 inch. lbs. (10 Nm)
    • Oil level indicator tube nut
      1. Torque to 89 inch. lbs. (10 Nm)
    • Secondary AIR injection control valve
    • Air cleaner assembly
    • Upper filler panel
  11. Fill the cooling system.
  12. Start the engine then idle until normal operating temperature is attained.
  13. Recheck coolant level and top off as needed.
  14. Test drive the vehicle.
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1helpful
1answer

Need a picture of a water pump housing for a 1998 eldorado

Water Pump Removal and Installation All Engines To Remove:
  1. Before servicing the vehicle, refer to the Cautions and Warnings in the beginning of this section.
  2. Remove or disconnect the following:
    • Coolant into a suitable container
    • Upper filler panel
    • Air cleaner assembly
    • Secondary AIR injection control valve gm_car_cad_sev_wtr_pmp_belt_shld.gif

    • Oil level indicator tube nut
    • Water pump belt shield fasteners
    • Water pump belt shield gm_car_cad_sev_wtr_pmp_drv_belt.gif

    • Water pump drive belt (D) gm_car_cad_sev_rad_outl_hos.gif

    • Radiator outlet hose from the thermostat housing gm_car_cad_sev_wtr_pmp_and_covr.gif

    • Water pump cover bolts
    • Water pump cover
    • Heater return hose
    gm_car_cad_sev_wtr_pmp_pulr.gif

  3. Position suitable water pump puller/installer tool (or special service tool J38816-A) to the water pump locking ears.
  4. Fasten the support plate to the water housing crossover to ensure proper engagement of the tool to the water pump locking ears.
  5. Remove or disconnect the following:
    • Pump from the housing:
      1. Use suitable water pump puller/installer tool (or special service tool J38816-A) to turn the pump clockwise
    • Support plate from the water housing crossover gm_car_cad_sev_wtr_pmp_rem.gif

    • Water pump
    • Seal from the water crossover
  6. Clean the sealing surfaces of the water housing crossover and the pump cover.
  7. Clean and inspect the water pump.
To Install:
  1. Install or connect the following:
    • Seal into the recessed portion of the water crossover
    gm_car_cad_sev_wtr_pmp_crosovr_seal.gif

    NOTE: The notched locking ear must be in the 7 o'clock position.
  2. Index the water pumps locking ears with the tangs in the water crossover.
  3. Position suitable water pump puller/installer tool (or special service tool J38816-A) to the water pump locking ears.
  4. Fasten the support plate to the water housing crossover to ensure proper engagement of the tool to the water pump locking ears.
  5. Turn suitable water pump puller/installer tool (or special service tool J38816-A) counterclockwise.
  6. Torque the water pump
    • Torque to: 74 ft. lbs. (100 Nm)
  7. Remove the support plate from the water housing crossover.
  8. Install or connect the following:
    • Water pump cover to the heater return hose
    • Water pump cover to the water housing crossover
    • Water pump cover bolts
      1. Torque to 89 inch. lbs. (10 Nm)
    • Radiator outlet hose to the thermostat housing
    • Water pump drive belt
  9. Place the water pump belt shield in position.
  10. Install or connect the following:
    • Water pump belt shield fasteners
      1. Torque to 89 inch. lbs. (10 Nm)
    • Oil level indicator tube nut
      1. Torque to 89 inch. lbs. (10 Nm)
    • Secondary AIR injection control valve
    • Air cleaner assembly
    • Upper filler panel
  11. Fill the cooling system.
  12. Start the engine then idle until normal operating temperature is attained.
  13. Recheck coolant level and top off as needed.
  14. Test drive the vehicle.
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1helpful
2answers

How do i replace a water pump on a 1997 vw passat

Water Pump REMOVAL & INSTALLATION 1.8L Engine NOTE: The coolant pump is bolted to the brackets for the generator, power steering pump, and cooling fan.
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Position the lock carrier into the service position as follows:
    1. Remove or disconnect:
      • Front bumper.
      • Any wiring or connector that would inhibit locking the carrier.
      • 3 quick-release screws on the front noise insulation panel.
      • Air guide between the lock carrier and the air filter.
      • Retaining clamps for the wiring harness at the left side of the radiator frame.
      • No. 2 bolts and install Support tool 3369 or equivalent.
      • Remaining bolts and pull the lock carrier out to the stop.
    2. To secure the lock carrier, install the appropriate M6 bolts into the rear of the lock carrier and fender.
  3. Remove or disconnect
    • Negative battery cable.
    • Accessory drive belt, then the engine driven cooling fan.
    • Coolant.
    • Clamps for the coolant hoses at the water pump.
    • Intake air duct between the intake manifold and the charge air cooler.
    • Generator mounting bolts and slide it forward.
    • Wiring from the generator once it is removed.
  4. Unbolt the following supports and brackets for the generator, power steering pump, and engine cooling fan:
    1. Intake manifold support
    2. Support for the engine torque bracket
    3. Brace to the cylinder block (remove completely)
  5. Remove or disconnect:
    • Brackets for the generator, power steering pump, and engine cooling fan, positioning the brackets to the left side using a piece of wire
    • Coolant hoses from the pump and thermostat housing
    • Coolant pump housing from the timing belt cover
    • Coolant pump mounting bolts, then the pump
    • Impeller housing from the pump housing
    To install: Fig. 1: Exploded view of the water pump, housing and related components — 1.8L engine 9301wg04.gif
    Fig. 2: Assembly bracket with water pump mounting bolt tightening sequence — 1.8L engine 9301wg05.gif

  6. Using a new gasket, mount the new coolant pump to the pump housing. Mounting bolts: 84 inch lbs. (10 Nm).
  7. Using a new gasket and O-ring, install the coolant pump. Mounting bolts in alphabetical sequence: 18 ft. lbs. (25 Nm).
  8. Tighten the coolant pump housing to the timing belt cover to 84 inch lbs. (10 Nm).
  9. Install or connect:
    • Coolant hoses to the pump and thermostat housing.
    • Brackets that were removed. Mounting bolts: 18 ft. lbs. (25 Nm).
    • Wires to the generator, then install the generator.
    • Air intake duct between the intake manifold and the charge air cooler.
  10. The remaining steps are the reverse of the removal.
  11. Fill the engine with coolant
  12. Fully close all power windows to stop, operate all window switches for at least 1 second in the close direction to activate the one-touch opening/closing function
  13. After installing the lock carrier, check the wiring for proper routing near the cooling fan
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1answer

Pump is constantly cycling on and off at the pressure limits of 40 and 60psi, respectively , when the water is being used.

Do you have a tank with a air bladder inside or do you have one with a air valve on the side?

I suspect you have a tank with an air valve. If that is the case, yours sounds like a classic case of "air bound". There is the possibility that you have a Blue tank with a air bladder inside trhat does not have a air valve on the side - but lets talk about the classic tank now.

Your pump is "short cycling" because there is very little air cushion at the top of your tank. What you need to do is get more air into your tank. Turn off your pump. Turn off the main water valve. Open the tank drain. Press in the (probably) black ball on the side of the air valve. Let the water all drain out. When the tank is empty, let go the black ball, close the tank drain, turn on the pump. When it stops, open the water main to the house.

Let me know what happens.

a

Sep 26, 2009 • Plumbing
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