Bilge Pump Mystery - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 11-30-2010
Member
 
Join Date: Jan 2009
Location: Texas
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
andantesail is on a distinguished road
Bilge Pump Mystery

Suddenly my bilge pump won't pump out the last few (=/- 8 inches) of water, thus leaving the float switch on. I've replaced the pump (checking polarity) the problem persists. Switched back to the other pump. Same thing. I've used a water hose to shoot water up the exit hose and out the thru hull. Still have the problem. I'm flat out of ideas other than to replace the exit hose, but I don't find any leaks in the current one. Any suggestions would be much appreciated.

Thanks
Karl
Andante PSC 34 #276
__________________
Karl
"Andante" PSC 34 #276
Reply With Quote Share with Facebook
  #2  
Old 11-30-2010
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
If the impeller has broken free of the hub, is slipping on the spindle, or is missing some blades, you might have this problem. When the water is higher, it requires less pressure from the pump to move it, since the water outside the pump, in the bilge, is adding pressure to the hose.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #3  
Old 11-30-2010
Omatako's Avatar
Senior Member
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,398
Thanks: 0
Thanked 27 Times in 24 Posts
Rep Power: 11
Omatako will become famous soon enough
Quote:
Originally Posted by sailingdog View Post
If the impeller has broken free of the hub, is slipping on the spindle, or is missing some blades, you might have this problem. When the water is higher, it requires less pressure from the pump to move it, since the water outside the pump, in the bilge, is adding pressure to the hose.
. . . . . but the pump has been replaced . . . . .
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

__________________

"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."

Arthur C. Clarke
Reply With Quote Share with Facebook
  #4  
Old 11-30-2010
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Has he checked the voltage at the pump end of the wiring? If the voltage is low, you'd have similar issues.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #5  
Old 11-30-2010
remetau's Avatar
Senior Member
 
Join Date: Jan 2009
Location: Bradenton, FL
Posts: 780
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 6
remetau is on a distinguished road
Maybe you had a one way valve in the hose that has gone bad letting the water in the hoses drain back down, but I would think that the pump would shut off at least until the water level hit the switch level.
__________________
Don & Diana
sv Re Metau an HC33t

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 11-30-2010
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Quote:
Originally Posted by remetau View Post
Maybe you had a one way valve in the hose that has gone bad letting the water in the hoses drain back down, but I would think that the pump would shut off at least until the water level hit the switch level.
If the impeller isn't spinning fast enough, the centrifugal type pumps, which most small integrated submersible bilge pumps are, aren't going to push water very well. The fact that he's changed pumps and that there isn't a problem with water going through the hose, makes me think it is voltage related.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #7  
Old 11-30-2010
jrd22's Avatar
Courtney the Dancer
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,816
Thanks: 3
Thanked 14 Times in 14 Posts
Rep Power: 14
jrd22 will become famous soon enough
That's kind of what I was thinking Rem, that maybe the vented loop was plugged before, creating a siphon out of the bilge at the end of the pump cycle, but now it's allowing the water in the hose to drain back into the bilge. If the pump runs continuously though I can't figure why it wouldn't pull the level down to where it would shut off until the water drained back in.

Edit- SD, you are probably on the right track. Low voltage would drastically reduce pump performance.
__________________
John
SV Laurie Anne

1988 Brewer 40 Pilothouse

Reply With Quote Share with Facebook
  #8  
Old 11-30-2010
Senior Member
 
Join Date: Jul 2009
Location: South Florida
Posts: 201
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
oceanscapt is on a distinguished road
Send a message via Skype™ to oceanscapt
Many pumps have a maximum lift spec. Could the difference be higher than that? When the bilge is heavy with water, the pressure will generally ovecome the lift difference or worn pump parts.
__________________
Capt. Douglas Abbott
USCG/MCA IV/C.I./M.I. 500-ton Oceans
PADI MSDT

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #9  
Old 11-30-2010
LakeSuperiorGeezer's Avatar
Senior Member
 
Join Date: Oct 2010
Posts: 551
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
LakeSuperiorGeezer is on a distinguished road
Bad float switch, or is that built into the pump?
Reply With Quote Share with Facebook
  #10  
Old 12-01-2010
brokesailor's Avatar
SV Skalliwag #141
 
Join Date: Jan 2008
Location: Homeport: Solomons, Maryland
Posts: 616
Thanks: 6
Thanked 3 Times in 3 Posts
Rep Power: 7
brokesailor is on a distinguished road
Check valve stuck shut?
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
The case of the bilge pump mystery JLBJR Gear & Maintenance 9 12-01-2010 04:59 AM
Installing automatic bilge pump in series with diaphram bilge pump... sweetdreamyamaha Gear & Maintenance 6 11-07-2009 11:36 AM
Shallow Bilge, Bilge Pump Switch labestia Gear & Maintenance 1 07-10-2009 02:40 PM
C&C 24 - Bilge Pump mfesak C & C 6 01-17-2009 09:19 AM
Brand new bilge pump that doesn't pump.... ugh Lancer28 Gear & Maintenance 6 02-08-2008 08:26 PM


All times are GMT -4. The time now is 05:04 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.