Bilge Pumps and back flow - 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 > Electrical Systems
 Not a Member? 
  #1  
Old 05-29-2009
Senior Member
 
Join Date: Feb 2008
Posts: 148
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
preservedkillick is on a distinguished road
Bilge Pumps and back flow

So I tear the Rule 2000 out and the hose before the refit. I flicked the switch and it ran for a few seconds..no further thought.

18 months later and I'm putting the pump back in, all cleaned up and tested in a bucket. Looks great. Dump some water in the bilge and the thing starts cranking. Really moves water..until the float shuts off, then the sizable hose full of water flows back to the bilge. Just enough for the pump to turn on, fill the hose then shut off, over and over.

What am I missing? No check valve, would rather not have one. I can't put a high point in the hose any nearer the pump.

Killick
__________________
Preserved Killick


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

Seagrass
Boothbay Harbor, ME
Alberg 30:
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
  #2  
Old 05-29-2009
hellosailor's Avatar
Senior Member
 
Join Date: Apr 2006
Posts: 10,369
Thanks: 1
Thanked 72 Times in 70 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
It sounds like you have hit a one-in-a-million combination where the volume of water in the hose, combined with the contour of your bilge, and the hysterisis of the float switch, are exactly right to make the returning water trip the float switch again and again.

Relocating the hose, raising the float switch (the pump, if that's integral) or changing the volume that the bilge holds by the float switch all would work. The may leave more water in the bilge or a less desirable hose run, but you'll have to pick the compromise. The alternative is to use one large pump as a "flooding" pump, and locate that an inch or two higher than your "drain pump" which is a small pump with a small hose, designed just to get the last half inch of water out.

Since bilge pumps seem to burn out frequently anyway, having a dual setup may be less wasteful than you think.
Reply With Quote Share with Facebook
  #3  
Old 05-29-2009
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
What HS is suggesting is the typical installation I usually recommend. Two pumps. The first is a maintenance pump and is smaller capacity, with a smaller hose, and has the float switch in the very bottom of the bilge. The second is a larger dewatering pump and has its float switch an inch or two higher.
__________________
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
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



All times are GMT -4. The time now is 03:06 AM.

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