Bilge Pump Mystery - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 20 Old 11-30-2010 Thread Starter
Member
 
Join Date: Jan 2009
Location: Texas
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
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
andantesail is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 20 Old 11-30-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 17 Times in 13 Posts
Rep Power: 15
         
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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #3 of 20 Old 11-30-2010
Senior Member
 
Omatako's Avatar
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,690
Thanks: 1
Thanked 36 Times in 33 Posts
Rep Power: 13
 
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
Omatako is offline  
Quote Quick Reply Share with Facebook
post #4 of 20 Old 11-30-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 17 Times in 13 Posts
Rep Power: 15
         
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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #5 of 20 Old 11-30-2010
Senior Member
 
remetau's Avatar
 
Join Date: Jan 2009
Location: Bradenton, FL
Posts: 780
Thanks: 0
Thanked 8 Times in 8 Posts
Rep Power: 8
 
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.
remetau is offline  
Quote Quick Reply Share with Facebook
post #6 of 20 Old 11-30-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 17 Times in 13 Posts
Rep Power: 15
         
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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #7 of 20 Old 11-30-2010
Courtney the Dancer
 
jrd22's Avatar
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,919
Thanks: 4
Thanked 26 Times in 25 Posts
Rep Power: 16
 
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

jrd22 is offline  
Quote Quick Reply Share with Facebook
post #8 of 20 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: 7
 
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.
oceanscapt is offline  
Quote Quick Reply Share with Facebook
post #9 of 20 Old 11-30-2010
Senior Member
 
LakeSuperiorGeezer's Avatar
 
Join Date: Oct 2010
Posts: 551
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Bad float switch, or is that built into the pump?
LakeSuperiorGeezer is offline  
Quote Quick Reply Share with Facebook
post #10 of 20 Old 12-01-2010
SV Skalliwag #141
 
brokesailor's Avatar
 
Join Date: Jan 2008
Location: Homeport: Solomons, Maryland
Posts: 741
Thanks: 18
Thanked 5 Times in 5 Posts
Rep Power: 9
 
Check valve stuck shut?
brokesailor is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome