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Sprinkler Pump Problem JackpipE 05-24-2008
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Posted by JackpipE on May 24, 2008, 1:16 pm
My sprinkler pump was leaking so fixed the leak and now I can't get
the pump to suck the water from the well again. The pump works and I
can get the air tank to about 20 PSI by adding water through the prime
plug while the pump is working. At about 20 PSI the water starts
coming back through the prime plug and I have to close it. The air
pressure stays at 20 PSI and there is no water coming from the well.
How can I get the pump back to work again? Here is a picture of my
system: http://www.existonline.com/temp/sprinkler_pupmp.jpg

Thanks,
Jack

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Posted by bob kater on May 24, 2008, 3:18 pm
you must have a leak on the suction side of the pump allowing air into the
system if not then the well point may be plugged up with sand.
> My sprinkler pump was leaking so fixed the leak and now I can't get
> the pump to suck the water from the well again. The pump works and I
> can get the air tank to about 20 PSI by adding water through the prime
> plug while the pump is working. At about 20 PSI the water starts
> coming back through the prime plug and I have to close it. The air
> pressure stays at 20 PSI and there is no water coming from the well.
> How can I get the pump back to work again? Here is a picture of my
> system: http://www.existonline.com/temp/sprinkler_pupmp.jpg
>
> Thanks,
> Jack



Posted by JackpipE on May 24, 2008, 4:04 pm
> you must have a leak on the suction side of the pump allowing air into the
> system if not then the well point may be plugged up with sand.

Bob,
Thank your for your reply.
How can I check if I have a leak on the suction side and which side is
the suction side?
After your post I re-adjusted the check valve (thinking that it's on
the suction side). Disconnecting the check valve while the pump was
working didn't cause lost of pressure in the pressure tank.

Jack



Posted by Bob F on May 24, 2008, 4:48 pm

>> you must have a leak on the suction side of the pump allowing air into the
>> system if not then the well point may be plugged up with sand.
>
> Bob,
> Thank your for your reply.
> How can I check if I have a leak on the suction side and which side is
> the suction side?
> After your post I re-adjusted the check valve (thinking that it's on
> the suction side). Disconnecting the check valve while the pump was
> working didn't cause lost of pressure in the pressure tank.

That check valve will prevent priming water from reaching the well, from what I
can see. Is this a shallow well? That's what it looks like to me. If you have a
vacuum pump available, or some way to create a high vacuum, connecting it to the
priming port would suck air up out of the well until water reaches the top. I
have used the suction hose on a sandblaster nozzle to do this.

Alternative - attach a water hose to the priming port (from a neighbor?), and
set it for a small flow to force air through the pump and fill it with water.
With this running, cycle the pump few a second or 3, until it stops pumping.
Stop it, wait for it to fill with water again, and repeat. You might need to do
this a lot of times, but it will eventually suck all the air out if there are no
leaks.

Disconnecting the output of the pump so it free flows, or opening a large valve
to release the pressure will help this process. The easier it can pump, the more
air you will get with each cycle. This might even help with the way you've been
trying it.



Posted by JackpipE on May 24, 2008, 6:35 pm
> >> you must have a leak on the suction side of the pump allowing air into the
> >> system if not then the well point may be plugged up with sand.
>
> > Bob,
> > Thank your for your reply.
> > How can I check if I have a leak on the suction side and which side is
> > the suction side?
> > After your post I re-adjusted the check valve (thinking that it's on
> > the suction side). Disconnecting the check valve while the pump was
> > working didn't cause lost of pressure in the pressure tank.
>
> That check valve will prevent priming water from reaching the well, from what I
> can see. Is this a shallow well? That's what it looks like to me. If you have a
> vacuum pump available, or some way to create a high vacuum, connecting it to
the
> priming port would suck air up out of the well until water reaches the top. I
> have used the suction hose on a sandblaster nozzle to do this.
>
> Alternative - attach a water hose to the priming port (from a neighbor?), and
> set it for a small flow to force air through the pump and fill it with water.
> With this running, cycle the pump few a second or 3, until it stops pumping.
> Stop it, wait for it to fill with water again, and repeat. You might need to do
> this a lot of times, but it will eventually suck all the air out if there are
no
> leaks.
>
> Disconnecting the output of the pump so it free flows, or opening a large valve
> to release the pressure will help this process. The easier it can pump, the
more
> air you will get with each cycle. This might even help with the way you've been
> trying it.

The water wasn't flowing because I never let the water out. Once I
open the valve outside the house (the water is used for watering the
lawn) the water kept coming from the well. So the system is working
again but the air pressure is still low. It never goes above 30 PSI
where before it would reach 45 and the pump would stop. Now the pump
never stops and the pressure never goes above 30. Could there still be
some air inside that would cause the low air pressure or there is an
air leak?

JP

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