Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-04-2013, 10:10   #1
Registered User
 
Berke's Avatar

Join Date: Mar 2011
Location: Turkey
Boat: BR, PCF 40, 40', 2011
Posts: 15
Fuel is leaking from tank ventilation tubes

Hi all;

I have motorsailer and when my tanks are full and the boat is heeling on either of the sides; fuel is leaking from ventilation tubes of the fuel tanks. Is there a practical way to eliminate that? I plan to install a simple valve and close the ventilation tubes while sailing but it doesnt sound propoer to me. I also dont prefer to make tubes longer.
__________________

__________________
Berke is offline   Reply With Quote
Old 02-04-2013, 10:25   #2
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,352
Re: Fuel is leaking from tank ventilation tubes

You mean leaking into the boat or into the water? If you close the valves you will develop a vacuum and the engine will quit.... if running. You could try looping the vent tube up above the vent fitting.
__________________

__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 02-04-2013, 10:28   #3
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,767
Re: Fuel is leaking from tank ventilation tubes

vent your starboard tank out to port and your port tank out to starboard if possible. this will guarantee your tank vents will be higher than your tanks when sailing.
__________________
Sailmonkey is offline   Reply With Quote
Old 02-04-2013, 10:32   #4
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by Sailmonkey View Post
vent your starboard tank out to port and your port tank out to starboard if possible. this will guarantee your tank vents will be higher than your tanks when sailing.
+1... Such a smart monkey!!!
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 02-04-2013, 10:32   #5
Registered User
 
lorenzo b's Avatar

Join Date: May 2009
Location: Panama
Boat: Steel trawler 63' Eileen Farrell
Posts: 961
Re: Fuel is leaking from tank ventilation tubes

Your tanks should not be filled to the top, leave at least 10% empty. When you are under power, make sure the fuel return line goes to either both tanks or the tank you are drawing from, or you will flood the other tank.
For now, put some of your fuel in cans until you need it.
__________________
lorenzo b is offline   Reply With Quote
Old 02-04-2013, 10:33   #6
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by Cheechako View Post
You mean leaking into the boat or into the water? If you close the valves you will develop a vacuum and the engine will quit.... if running. You could try looping the vent tube up above the vent fitting.
Agreed!
A loop too is also good for keeping out water, especially when washing down the boat with a hose. But also your vent fitting should as high as possible. On ships they run a stand pipe, with a loop at the top, up on deck. One could do the same by installing a deck fitting and run a looped hose up a stanchion, or ?
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 02-04-2013, 10:44   #7
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by Sailmonkey View Post
vent your starboard tank out to port and your port tank out to starboard if possible. this will guarantee your tank vents will be higher than your tanks when sailing.
Yeah, if the vent fitting is on the outboard side of the tanks. Otherwise, it wouldn't make any difference.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 02-04-2013, 10:46   #8
Registered User
 
Panope's Avatar

Join Date: Sep 2012
Location: Washington State
Boat: Colvin, Saugeen Witch (Aluminum), 34'
Posts: 1,593
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by delmarrey View Post
Agreed!
A loop too is also good for keeping out water, especially when washing down the boat with a hose. But also your vent fitting should as high as possible. On ships they run a stand pipe, with a loop at the top, up on deck. One could do the same by installing a deck fitting and run a looped hose up a stanchion, or ?
Fuel vent is just above the upper starboard door hinge. One vent for both Port and Starboard tanks. Works good.

Steve
Attached Thumbnails
Click image for larger version

Name:	2013 Feb 132.jpg
Views:	95
Size:	413.9 KB
ID:	58449  
Panope is offline   Reply With Quote
Old 02-04-2013, 10:51   #9
Registered User
 
transmitterdan's Avatar

Join Date: Oct 2011
Boat: Valiant 42
Posts: 4,019
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by delmarrey View Post
Yeah, if the vent fitting is on the outboard side of the tanks. Otherwise, it wouldn't make any difference.
I don't understand this comment. Vent fittings should be on top of the tank, not on the side. What manufacturer puts vent fittings into the sides of fuel tanks?
__________________
transmitterdan is offline   Reply With Quote
Old 03-04-2013, 02:00   #10
Registered User
 
Berke's Avatar

Join Date: Mar 2011
Location: Turkey
Boat: BR, PCF 40, 40', 2011
Posts: 15
Re: Fuel is leaking from tank ventilation tubes

Fuel is leaking on the deck, ventilation tubes are as high as the bulwarks. so making them longer will look quite ugly. opposite side ventilation idea by Sailmonkey is quite interesting. that might work as I have a lot space in the engine room where tanks are located so extra piping may work, though they need to go above engine which may create some heating issues for those plastic tubes.
do you know if any valve that may let air into the tanks but not letting fuel go out?
I have two tanks and they are connected, one idea I have is to close their link when the tanks are full, so to lessen the pressure coming from opposite side tank to the heeling side. but this will also require a lot manual job.
__________________
Berke is offline   Reply With Quote
Old 03-04-2013, 04:04   #11
Registered User
 
transmitterdan's Avatar

Join Date: Oct 2011
Boat: Valiant 42
Posts: 4,019
Quote:
Originally Posted by Berke View Post
Fuel is leaking on the deck, ventilation tubes are as high as the bulwarks. so making them longer will look quite ugly. opposite side ventilation idea by Sailmonkey is quite interesting. that might work as I have a lot space in the engine room where tanks are located so extra piping may work, though they need to go above engine which may create some heating issues for those plastic tubes.
do you know if any valve that may let air into the tanks but not letting fuel go out?
I have two tanks and they are connected, one idea I have is to close their link when the tanks are full, so to lessen the pressure coming from opposite side tank to the heeling side. but this will also require a lot manual job.
I think that could be your problem. The fuel from the high side tank is forcing it out of the low side tank. Opposite side ventilation will not help this case. It sounds like the previous owner did not understand how diesel tanks work. In dual tank installations there should be valves before the Y connection where the tanks are connected together. Same is true for the fuel return. Then you only open the 2 valves associated with one tank at a time. Then heel should not cause a problem. Plus you can transfer fuel from one tank to the other by opening the opposite return line valve for a short period of time.

Can you insert 4 manual ball valves where the fuel supply and return lines join together?
__________________
transmitterdan is offline   Reply With Quote
Old 03-04-2013, 07:40   #12
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,575
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by Panope View Post
Fuel vent is just above the upper starboard door hinge. One vent for both Port and Starboard tanks. Works good.

Steve

So if you do have a leak, you lubricate the hinges? Genius!

Actually, if you fabricated that companionway yourself, I am very impressed. I am having very little luck finding a local aluminum fabricator and none of the "pros" out your way seem to want the job: too small.

By the way, North Sea trawlers, which do a lot of heeling, sometimes have the tanks vent to a gooseneck fitting high on the sides of their pilothouses.
__________________
Can't sleep? Read www.alchemy2009.blogspot.com for fast relief. Can't read? Avoid www.volumesofsalt.blogspot.com, because it's just personal reviews of sea books.
S/V Alchemy is offline   Reply With Quote
Old 03-04-2013, 08:20   #13
Registered User
 
Panope's Avatar

Join Date: Sep 2012
Location: Washington State
Boat: Colvin, Saugeen Witch (Aluminum), 34'
Posts: 1,593
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by S/V Alchemy View Post
So if you do have a leak, you lubricate the hinges? Genius!

Actually, if you fabricated that companionway yourself, I am very impressed. I am having very little luck finding a local aluminum fabricator and none of the "pros" out your way seem to want the job: too small.

By the way, North Sea trawlers, which do a lot of heeling, sometimes have the tanks vent to a gooseneck fitting high on the sides of their pilothouses.
I had not thought of the self lubricating hinge aspect - so no genius here. If fact, the Port side hinge has the raw water intake loop vent above it - so a leak there "lubricates" the hinge with salt water!

I will take the credit for building the companionway (and everything else above deck).

Steve
Panope is offline   Reply With Quote
Old 03-04-2013, 08:31   #14
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,767
Re: Fuel is leaking from tank ventilation tubes

Quote:
Originally Posted by Berke View Post
Fuel is leaking on the deck, ventilation tubes are as high as the bulwarks. so making them longer will look quite ugly. opposite side ventilation idea by Sailmonkey is quite interesting. that might work as I have a lot space in the engine room where tanks are located so extra piping may work, though they need to go above engine which may create some heating issues for those plastic tubes.
do you know if any valve that may let air into the tanks but not letting fuel go out?
I have two tanks and they are connected, one idea I have is to close their link when the tanks are full, so to lessen the pressure coming from opposite side tank to the heeling side. but this will also require a lot manual job.
This will help

Lifeguard LG100 Fuel/Air Separator - Racor | Fisheries Supply

But you really need to remove the cross connection on the tanks. If you vent out opposite sides, and the tanks are not cross connected you'll probably no longer have a problem. I would build a manifold for fuel supply and return that is accessible from somewhere easy to access.
__________________
Sailmonkey is offline   Reply With Quote
Old 03-04-2013, 13:52   #15
Registered User
 
Berke's Avatar

Join Date: Mar 2011
Location: Turkey
Boat: BR, PCF 40, 40', 2011
Posts: 15
Re: Fuel is leaking from tank ventilation tubes

thank you all. i will try to find that seperator in Turkey; though it wouldn't be easy.
There are valves in between tanks and I will try cutting the link when tanks are full.
__________________

__________________
Berke is offline   Reply With Quote
Reply

Tags
fuel

Thread Tools
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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:57.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.