Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 09-12-2016, 12:48   #1
Registered User

Join Date: Nov 2016
Posts: 12
Can't prime out of forward fresh water tank

Hello all,

This forum was incredibly useful for my starter issue, so I figured I'd give it a go for the water system.

The boat is a 1981 Catalina 30, and the fresh water system is currently rigged as a small tank under the port side seat and then a much larger tank under the forward v-berth. The boat is relatively new to me. The two water lines from the tanks join in a t junction under the aft berth prior to going to the electric water pump. I accidentally ran the system dry a month ago, and filled both tanks via the tanks themselves (opening on top) as I wasn't sure how the outside fillers were plumbed. About 2 weeks later I ran out of water (about 6 times faster than I was expecting). It seems that the side tank was dry and the forward tank was still full. So, I refilled the side tank, and happily had water for another two weeks. It primes and pressures very well when pumping with a faucet open from the side tank. Just not the front tank.

Today, I've got some time and I'm trying to sort out how to get the water flowing from the front tank. The line attaches to the bottom of the tank through a plastic valve, the valve is open however it doesn't seem like water is freely entering the line... I would take the valve off, but unfortunately the tank is full.

Just looking for suggestions at this point. Thank you all for your help!

E
__________________

esp803 is offline   Reply With Quote
Old 09-12-2016, 13:18   #2
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat in La Paz)
Boat: Valiant V40
Posts: 714
Re: Can't prime out of forward fresh water tank

Air leak between the forward tank and the select valve.
__________________

jamhass is offline   Reply With Quote
Old 09-12-2016, 13:20   #3
Registered User

Join Date: Apr 2013
Location: So Cal
Boat: Catalina 30
Posts: 954
Re: Can't prime out of forward fresh water tank

That's the typical way C-30s were plumbed with two tanks. (My second tank was removed somewhere along the line).

Just pull the hose off of the forward tank - the bottom of the tank, the valve, the hose, or the T fitting is plugged. So 25 gal of fresh water ends up in your bilge? Nice rinse and test of your bilge pump.

T fitting must be below the outlets of both tanks, or the pump will suck air from the empty tank. Usually the fwd tank will kinda fill the one under the stbd settee back up as it's a bit higher in the boat.
jeepbluetj is offline   Reply With Quote
Old 09-12-2016, 15:02   #4
Registered User

Join Date: Apr 2011
Posts: 2,388
Re: Can't prime out of forward fresh water tank

How are the two tanks vented? My Bristol has a similar arrangement, with vents on both tanks, consisting of a loop placed higher than the tank. If a vent is blocked, that can also cause problems with one tank draining into the other.
__________________
Bristol 31.1, SF Bay.
MarkSF is offline   Reply With Quote
Old 10-12-2016, 10:52   #5
Registered User
 
OS2Dude's Avatar

Join Date: Nov 2014
Location: Atlanta, GA
Boat: Catalina 30
Posts: 315
Images: 5
Re: Can't prime out of forward fresh water tank

I had exactly the same issue with our 1985 C-30 mkI. The hose from the forward tank makes a hard bend to run down the starboard side under the starboard tank to join at the 'T' fitting under the aft quarter berth.

After MUCH fretting about, I finally discovered the hose had crimped at the corner, effectively closing the hose. I pulled on it a while and it eventually shifted, then the water started to flow. Don't know if it was pinched that hard, or the gunkiness of old vinyl had 'glued' it or what held it in place that hard but the water does flow now.

You should have two fresh water deck fills on the starboard side by the chain plates. One fill for each tank.

Fair Sailing
OS2Dude is offline   Reply With Quote
Old 10-12-2016, 12:12   #6
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,747
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: Can't prime out of forward fresh water tank

check system back pump to tank and take with you a screwdriver or wrench for hose clamps..mebbe anew hose.... sounds like there is a system fail upstream from pump. good luck
__________________
life is an adventure meant to be LIVED!!!!
https://www.cruisersforum.com/forums...oul+mates.html


https://sksolitarybird.org/
zeehag is offline   Reply With Quote
Old 11-12-2016, 09:11   #7
Registered User

Join Date: Dec 2015
Location: Nanaimo BC
Boat: modified Spray 56' oa
Posts: 363
Re: Can't prime out of forward fresh water tank

Cheap plastic valves can be over tightened,torque off the shaft and never open again.
__________________

topmast is offline   Reply With Quote
Reply

Tags
fresh water tank, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Water tank. Top mounted dip or pickup tube? Will a Whale Galley pump prime? Zach Plumbing Systems and Fixtures 2 12-12-2013 18:10
Refrigerator Water Cooled to Fresh Water Tank kiltym Plumbing Systems and Fixtures 47 27-05-2013 10:30
Convert Fresh Water Tank to Holding Tank - Stainless myocean Plumbing Systems and Fixtures 5 17-01-2013 09:05
Fresh Water pump will not prime in Engine crazyhorse77 Engines and Propulsion Systems 5 19-04-2011 07:17
Forward Osmosis for Fresh Water Source ? boat_alexandra Plumbing Systems and Fixtures 2 27-03-2010 08:57

Advertise Here


All times are GMT -7. The time now is 19:10.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.