Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-16-2018, 05:59 PM   #1
Member
 
City: Miami
Country: United States
Vessel Name: Odyssea
Vessel Model: Mainship 390
Join Date: Feb 2017
Posts: 18
Water pump keeps running on Mainship 390 for no reason

My water pump keeps kicking on every 20 minutes or so for about 3 seconds.
The manual states this indicates a leak. There's not much to check. The forward and aft shower's. The bathroom sink and shower. The water heater. I don't see anything. I live in the Fort Lauderdale area and have been very disappointed whenever I have needed work done (Besides Wards Electric). Does anybody know somebody good in the area?
__________________
Advertisement

Paul Baker is offline   Reply With Quote
Old 09-16-2018, 06:27 PM   #2
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,373
If no leaks...and they can literally be a few drops...

Then many times it is internal bypass within the pump. If that, you can rebuild or replace the pump end or the whole pump.

Every 20 minutes isn't bad unless it wakes you up. It might stay like that for many months if you can stand it.
__________________

psneeld is online now   Reply With Quote
Old 09-16-2018, 07:48 PM   #3
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Vancouver Shipyards Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,187
Shut it off until you need it?
__________________
Don't believe everything that you think.
What are we offended about today?
Xsbank is offline   Reply With Quote
Old 09-16-2018, 08:22 PM   #4
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 7,307
If you have a pressure tank, check the bladder air pressure. Loss of air in the bladder may be making the pump short cycle. You still have a leak to find, but most pumps with pressure tanks run for more than 3 seconds.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 09-16-2018, 08:27 PM   #5
Guru
 
wkearney99's Avatar
 
City: Bethesda, MD
Country: USA
Vessel Name: Solstice
Vessel Model: Grand Banks 47 Eastbay FB
Join Date: Feb 2018
Posts: 847
What make/model pump is it? Most will have a pressure switch of sorts that detects when pressure drops and will run the pump accordingly. If that switch is broken it'll cause the pump to run. But there's a ton of places where something can leak.

What kind of piping is in the boat? The push-fit Whale style? Might be an easy way to check the pump by stubbing off the out side with a valve. That'd narrow it down, right quick.
__________________
-- Bill Kearney
2005 Eastbay 47 FB - Solstice
wkearney99 is offline   Reply With Quote
Old 09-17-2018, 05:53 AM   #6
Guru
 
motion30's Avatar
 
Join Date: Jan 2010
Posts: 921
I bet it's the jabsco pump. They tend to leak internally. I've had several and tried replacing the pressure switch with no avail. The final solution was to avoid jabsco products
motion30 is offline   Reply With Quote
Old 09-17-2018, 06:04 AM   #7
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,696
That run time indicates a steady dripping leak externally.
Check the water heater relief valve and all around the base of the water heater for dampness.
Is there any trail of water leaking into the bilge? Get a bright light and check everywhere there is plumbing, not just at the end equipment.
Also could be an internal pump check valve leak as mentioned above.
Do you not have a galley sink? Ice maker? Shower on the transom?
__________________
Archie
1984 Monk 36 Hull #46
Currently in Cape May, NJ
High Wire is offline   Reply With Quote
Old 09-17-2018, 06:05 AM   #8
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,373
Its not just Jabsco, I have had at least 4 different manufactures including Shuflo, Seaflo, Five Oceans...... forgot the other (s).....

Now whether they are all clones under different names....or have the same parts in the pump sections I cant say....

But the one or two second burps are often the inyernal bypass after completely sure you dont have a leak....including electric toilets, etc....
psneeld is online now   Reply With Quote
Old 09-17-2018, 06:24 AM   #9
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,341
Next O' nite or when you leave the boat, turn off the pump.

On return ,switch pump on and monitor, if its a system leak the pump will run for a while, if it an internal leak the run time will be short .
FF is offline   Reply With Quote
Old 09-17-2018, 06:25 AM   #10
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Country: USA
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 3,500
Hunt down the accumulator, try bleeding from the tire valve stem. If you immediately get water and no air, the accumulator has failed. Replace the accumulator If you get air, a few strokes with a hand pump to replace the pressure you bled off. Onward in your trouble shooting.
__________________
I will update this as soon as I can think of something snappy.
OldDan1943 is online now   Reply With Quote
Old 09-17-2018, 06:37 AM   #11
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 19,373
Good advice FF.

Is there even an accumultor in the system?
psneeld is online now   Reply With Quote
Old 09-17-2018, 08:58 AM   #12
Senior Member
 
The Other Gary's Avatar
 
City: Toronto
Country: Canada
Vessel Name: Adios Dinero
Vessel Model: Bayliner 3988 2 x 330 Cummins
Join Date: Sep 2016
Posts: 331
The most common cause of this is the internal check valve on the inlet side of the pump. Water leaks back into the tank past the check valve and the pump comes back on to build pressure. It can rive you crazy as it is a leak with no visible water loss at all.
The Other Gary is offline   Reply With Quote
Old 09-17-2018, 09:13 AM   #13
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,457
Greetings,
Mr. PB. Can't add anything to the good suggestions already posted BUT I am also looking for competent trades people in FLL. Many, many good businesses there with helpful and very competent counter staff BUT no field workers that are worth the extortion of $100+/hr rates charged. I don't mind high fees but please send someone, ANYONE who knows which end of a screwdriver to use...
__________________
RTF
RT Firefly is offline   Reply With Quote
Old 09-17-2018, 10:04 AM   #14
Guru
 
OldDan1943's Avatar
 
City: Aventura FL
Country: USA
Vessel Name: Kinja
Vessel Model: American Tug 34 #116
Join Date: Oct 2017
Posts: 3,500
Quote:
Originally Posted by RT Firefly View Post
Greetings,
Mr. PB. Can't add anything to the good suggestions already posted BUT I am also looking for competent trades people in FLL. Many, many good businesses there with helpful and very competent counter staff BUT no field workers that are worth the extortion of $100+/hr rates charged. I don't mind high fees but please send someone, ANYONE who knows which end of a screwdriver to use...
Where abouts in FL and what do you need done? I maybe able to recommend a few folks.

RT, you meant to say, "$100 PLUS"
I learned my lesson when it comes to 'shade-tree' mechanics and one boatyard.
__________________
I will update this as soon as I can think of something snappy.
OldDan1943 is online now   Reply With Quote
Old 09-17-2018, 11:28 AM   #15
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,696
You can prove the check valve condition by immediately after it pumps up, close the tank outlet and remove the pump inlet hose. The water should drain out of the pump and stop. If it keeps draining then the check valve(s) are leaking.
High Wire is offline   Reply With Quote
Old 09-17-2018, 12:55 PM   #16
Guru
 
City: Between Oregon and Alaska
Country: US
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 1,467
If no sink/shower leaks, it's the pump valves leaking. Water leaving the pump goes thru a check valve. The valve holds pressure for the whole system after the pump shuts off.
If the valve seal is bad, and it could be as simple as a piece of debris embedded in the seal, water will slowly leak back to the pump water source.
Lepke is offline   Reply With Quote
Old 09-17-2018, 12:56 PM   #17
Veteran Member
 
George Harmon's Avatar
 
City: Indian Harbour Beach
Country: United States
Vessel Name: Blue Moon
Vessel Model: Mainship Pilot 30 Rum Runner II
Join Date: Jan 2018
Posts: 56
I had the same problem a few years back and found that all that was needed to stop the intermittent running was to snug-up all the hose clamps on the water lines from the pump downstream. Not sure which one was the culprit, but some did tighten significantly during the procedure.
George Harmon is offline   Reply With Quote
Old 09-17-2018, 03:54 PM   #18
Member
 
City: Miami
Country: United States
Vessel Name: Odyssea
Vessel Model: Mainship 390
Join Date: Feb 2017
Posts: 18
Quote:
Originally Posted by OldDan1943 View Post
Where abouts in FL and what do you need done? I maybe able to recommend a few folks.

RT, you meant to say, "$100 PLUS"
I learned my lesson when it comes to 'shade-tree' mechanics and one boatyard.
My boat is docked behind a private residence in Lauderdale Isles. I have a bilge pump that doesn't get all the water out. We plan on going to the Bahamas in January for 6 months or so, so I'm looking for someone to show me how to change impellers, do oil changes and change filters. Only had the boat since July. Whenever i have had someone to "fix" something they spend hours without rectifying the issue.
Paul Baker is offline   Reply With Quote
Old 09-17-2018, 05:09 PM   #19
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,457
Greetings,
Mr. PB. Do you have engine and/or equipment manuals? IF you can find a comfortable place to sit beside the engine or in the engine space, have the engine manual at hand as well as an inspection mirror and a GOOD source of light and imagine going through the steps to perform various service tasks.



If changing impellers, for example, what tools will you need? Is there anything in the way that has to be removed before you can change an impeller? Can you actually see and reach everything you have to? When you drop your wrench or a screw/nut/bolt, where will it end up? That sort of stuff.
__________________
RTF
RT Firefly is offline   Reply With Quote
Old 09-17-2018, 05:40 PM   #20
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,696
Quote:
Originally Posted by Paul Baker View Post
My boat is docked behind a private residence in Lauderdale Isles. I have a bilge pump that doesn't get all the water out. We plan on going to the Bahamas in January for 6 months or so, so I'm looking for someone to show me how to change impellers, do oil changes and change filters. Only had the boat since July. Whenever i have had someone to "fix" something they spend hours without rectifying the issue.
Sounds like a shout out for help from a local TFer. Anyone in the neighborhood?
__________________

__________________
Archie
1984 Monk 36 Hull #46
Currently in Cape May, NJ
High Wire is offline   Reply With Quote
Reply

Tags
390, mainship, water leak

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 07:41 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012