Tip & How-To about Plumbing

Jet Well Pump Well Jet Water Pump

One of the most frustrating things in plumbing can be the priming of a jet well pump. Well jet water pumps are sometimes difficult to get working properly because it is very difficult to get all of the air out of the system and the pump. Well domestic water systems are great for those that need them but you need to know how to approach the air removal part.

Here are some things that will help you prime both deep well jet pumps and shallow well jet pumps.

  1. Always install a tee and a valve at a high point directly above the outlet of the pump. This will give you a place to pour water in and allow the air to get out easily.
  2. Always install a “throttling” valve on the “out” side of the pump. This will let you keep back pressure on the pump. This is especially needed for deep well applications.
  3. Install a switch close to the pump to make starting and stopping the pump easy.
  4. Make sure that the “suction” pipe coming to the pump runs continuously uphill and is not trapped anywhere.
  5. Make sure that the suction pipe is at least as large as the intake fitting on the pump.
  6. Make sure that all fittings on the suction pipe are air tight

To prime the pump begin by filling the pump and suction pipe slowly with water, allowing the air to escape as you fill. This may take quite a bit of water depending on the size and length of the pipe.
When you can get no more water to go in the pipe, then close the valve on the fill and start the pump with the “out valve” closed or mostly closed. If the pump starts to go on and off rapidly, open the out valve just a bit more, till the pumps runs continuously.
If the pump starts to pump and then stops because of an air pocket, then you may need to restart the whole procedure and add more water. Keep doing this till all of the air is worked out of the system. For some systems this can be a long and laborious procedure.
Keep working the procedure and eventually you will have your system pumping.
http://www.fixya.com/support/r3691134-pressure_switch_adjustment_water

http://www.fixya.com/support/r3690937-pump_problems_pressure_switch

http://www.fixya.com/support/r3690698-pump_problems_water_tank

http://www.fixya.com/support/r3689163-water_problems_pump_problems

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1 Answer

how to prime a gould j5 well pump no plug on top


you have to have electric power to use a jet pump more info needed as to what is going on

Nov 04, 2012 | Jet Flo 04325143A Marine Heavy Duty Water...

1 Answer

water is coming from well to pump, but pump will not pick up the water when trying to prime


If well is too deep for the pump, sometimes a foot valve is needed.

ALSO check that there is no back pressure on the output side.

Oct 31, 2009 | Flotec Corrosion Resistant Shallow Well...

2 Answers

jet pump does not pump water


I had a similar problem and as a last resort took the pump apart and cleaned it and the jet. It's a very old pump but works ok now.
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Jun 18, 2009 | Flotec Corrosion Resistant Shallow Well...

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i have a flotec water pump that sits on top of my pressure tank, pump worked ok last season, and when we tried to prime the pump to start this season, it wont pull water up from the well pipe, pump will pump out prime water from a water spicket on side of well house.


if the pump is working correctly, it can either be, need more water to prime it, or something in the well, such as low water, plugged filter, etc....sometimes when you have a system that is intermittently used, it can take 20 or 30 minutes of continuous priming to get it to pull, enough water to maintain the prime.

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

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shallow well pump made by wayne well is 22 feet deep pump runs no


Inspect the jet thru the suction pipe or the removable plug if the pipe isn't inline with the center of the impeller. The jet is very small, and easy to get something stuck in there. Then prime and leave the pressure pipe closest to the outlet slightly loose to let air out. Once you get good pressure you can tighten the pipe. Sometimes you have to prime more than once to get all the air out of the well pipe.

Mar 21, 2009 | Flotec Corrosion Resistant Shallow Well...

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