Pump suction problems - Koi Forum - Koi-Bito Magazine

farne230 · 01-23-2008

Suggestions please, one of three identicle proformance pro A75 low rpm pumps will not fill the pump basket chamber full of water (about 1/3 to 1/2). The other work fine.

CarolinaGirl · 01-23-2008

Possibly an air leak in the line somewhere?

kntry · 01-23-2008

Either you have an air leak before the pump or your primer pot is leaking around the "O" ring.

farne230 · 01-23-2008

I have removed the chamber cover, cleaned and added rubber preservative to gasket. I have stood on top of the lid no change. The exposed pipping seams tight, no visible water, or noise, tried to disconnect fittings, to tight. Pump is not making any noise.

CarolinaGirl · 01-23-2008

If it's a suction line, you would not necessarly see a leak in the piping though.....water won't come out if air is being sucked in. Any way to push water through the pipe the other way? Or pump air thru the pipe and soap up the exposed joints? That way even a small pin hole leak of air would bubble.

CarolinaGirl · 01-23-2008

Another though. Try putting a different pump on that line and see if it works. If it does, you will know the problem is with the pump and not somewhere else in the line.

farne230 · 01-23-2008

There are three three way valve on the system. If I close the discharge from pump, waste is closed and either turn the vavle to backwash or filter and then soap the joints will I see the leaks?

kntry · 01-23-2008

One thing that worked for me, if you don't have too many joints and don't mind the messy look, use the blue water pvc glue. Put it around each joint while the pump is running. If it's sucking air, you'll see the glue being sucked in. You may want to paint your pipes after.

Steve Nguyen · 01-24-2008

I helped my friend troubleshooting similar problem. here are my suggestions:
1. clean the leaves basket lid and close it tightly. then re-start the pump and inspect for air bubbles. you should see some little bubbles if there is air leaks. if you see some bubbles, you know the problem is air leak
2. find the air leak on intake pipe starting from the pond edge to your pump
3. if you can't see any air leak, swap this pump with the other pump since you have 3 identical pumps. if the problem follows, you know it's the pump. if the problem didn't follow, start digging. your intake pipe has an air leak somewhere.

good luck

Steve

Quote:

Originally Posted by farne230

Suggestions please, one of three identicle proformance pro A75 low rpm pumps will not fill the pump basket chamber full of water (about 1/3 to 1/2). The other work fine.

paladin_k2 · 01-24-2008

You could also have just a "simple" impeller problem with some sort of fiber wrapped around the impeller.

Steve's suggestion of swapping pumps is good because it will quickly let you isolate the piping issues from the pump issues.

It is not uncommon to have to clean or replace and impeller once in a while.

01-23-2008	#1 (permalink)
farne230 Tategoi Join Date: Jan 2006 Location: San Antonio, Texas Posts: 303	Pump suction problems Suggestions please, one of three identicle proformance pro A75 low rpm pumps will not fill the pump basket chamber full of water (about 1/3 to 1/2). The other work fine.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Polygeyser vs Alpha 1 and Pump recommendations	CBRS2K	General Koi Forum	36	05-15-2007 11:08 AM
Broken Pump or Blocked Pipe?	androal	General Koi Forum	7	03-26-2007 03:07 PM
a question regarding pumps i couldn't answer	dick benbow	General Koi Forum	14	11-17-2006 03:26 AM
Toshio Sakai's "Clean Water System" (US Patent No. 6,318,292)	xiaohuang7	General Koi Forum	41	09-28-2006 12:39 PM
Defect In Dragon Pumps	SCVkoiboy	General Koi Forum	41	10-20-2005 05:38 AM

01-23-2008	#2 (permalink)
CarolinaGirl Jumbo Join Date: Sep 2006 Location: South Carolina Posts: 592	Possibly an air leak in the line somewhere?

01-23-2008	#3 (permalink)
kntry Tategoi Join Date: Oct 2004 Posts: 404	Either you have an air leak before the pump or your primer pot is leaking around the "O" ring.

01-23-2008	#4 (permalink)
farne230 Tategoi Join Date: Jan 2006 Location: San Antonio, Texas Posts: 303	I have removed the chamber cover, cleaned and added rubber preservative to gasket. I have stood on top of the lid no change. The exposed pipping seams tight, no visible water, or noise, tried to disconnect fittings, to tight. Pump is not making any noise.

01-23-2008	#5 (permalink)
CarolinaGirl Jumbo Join Date: Sep 2006 Location: South Carolina Posts: 592	If it's a suction line, you would not necessarly see a leak in the piping though.....water won't come out if air is being sucked in. Any way to push water through the pipe the other way? Or pump air thru the pipe and soap up the exposed joints? That way even a small pin hole leak of air would bubble.

01-23-2008	#6 (permalink)
CarolinaGirl Jumbo Join Date: Sep 2006 Location: South Carolina Posts: 592	Another though. Try putting a different pump on that line and see if it works. If it does, you will know the problem is with the pump and not somewhere else in the line.

01-23-2008	#7 (permalink)
farne230 Tategoi Join Date: Jan 2006 Location: San Antonio, Texas Posts: 303	There are three three way valve on the system. If I close the discharge from pump, waste is closed and either turn the vavle to backwash or filter and then soap the joints will I see the leaks?

01-23-2008	#8 (permalink)
kntry Tategoi Join Date: Oct 2004 Posts: 404	One thing that worked for me, if you don't have too many joints and don't mind the messy look, use the blue water pvc glue. Put it around each joint while the pump is running. If it's sucking air, you'll see the glue being sucked in. You may want to paint your pipes after.

01-24-2008	#10 (permalink)
paladin_k2 Tosai Join Date: May 2007 Location: Colorado, USA Posts: 38	You could also have just a "simple" impeller problem with some sort of fiber wrapped around the impeller. Steve's suggestion of swapping pumps is good because it will quickly let you isolate the piping issues from the pump issues. It is not uncommon to have to clean or replace and impeller once in a while.