Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-10-2014, 00:56   #1
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Suggestions for a diesel day tank.

I finally tracked another mystery diesel leak on the boat to the 50 litre SS gravity feed tank above the engine. Looks like the tank is starting to fail at the seems. It's 30 years old, so I reckon it is for the bin.

A replacement SS Cruise tank of similar dimensions is a fairly brutal AU$400 without a fuel gauge, and then the tank will need some mods as it only has one breather and a pickup, whereas I need a breather, a pickup and a return line. I've been living with an arrangement where I "T"d the return line to the breather, but it's a pain when filling as it takes the filler a moment to "burp" the breather line clear before the tank fills smoothly. Usually end up sloshing a bit of fuel out the filler port.

The location of the tank is pretty easy to get at, it just slides into a shelf above the engine room. Current tank is a bit under 700mm wide, 500 mm front to back and about 200mm deep, 50 useable litres. There's a fair bit of room around the tank it all directions, so I can play with those dimensions a bit. The engine is a bit thirsty at 1 litre per nautical mile, so I'd like to have at least 50 litres in the new tank if I can. Transfer to the tank from the main tanks is done using a small electric diesel transfer pump or filling straight from a jerry can.

Can anyone suggest a more economical tank supplier or a clever way of throwing slightly less money at the problem? I've done the usual web searching but aside from somewhat suspect poly tanks, I've not found anything particularly budget friendly. Clearly it will help if the supplier is in Oz, but a supplier who will ship to Oz is also fine, I am no particular rush, I can use Jerry cans for now.

Are poly tanks OK to use in this situation...?

Matt
__________________

__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is offline   Reply With Quote
Old 25-10-2014, 01:46   #2
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Suggestions for a diesel day tank.

Hmmm... one suggestion just made to me is to just fibreglass the outside of the existing tank. Seems like it might be practical. It is only ever going to hold diesel, and it seems structurally sound aside from the failed seams. I am getting ok at fibreglassing, and it's a pretty straightforward shape.

A smart option...?
__________________

__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is offline   Reply With Quote
Old 25-10-2014, 01:53   #3
Registered User

Join Date: Mar 2009
Location: Australia, Central Coast.
Boat: Boden 36 Triple chine long keel steel, named Nekeyah
Posts: 776
Re: Suggestions for a diesel day tank.

For vintage vehicle tanks there is a preparation that you wash around the inside of the tank to seal it. You buy it as a kit. Maybe it would work for diesel. Worth checking.

Regards,
Richard.
__________________
boden36 is offline   Reply With Quote
Old 25-10-2014, 03:16   #4
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 7,331
Re: Suggestions for a diesel day tank.

Why are the poly tanks suspect that you have seen?
The "right" poly tank is suitable for diesel / petrol - reference plastic fuel containers and outboard tanks.

Another option is to build your own out of plywood and epoxy inside (and out).
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is online now   Reply With Quote
Old 25-10-2014, 03:55   #5
Marine Service Provider

Join Date: Jan 2014
Posts: 49
Re: Suggestions for a diesel day tank.

A fuel bladder can be put in the tank, might have to remove a baffle or imperfections that would puncture or wear on it. Rig a jerry can if in a pinch.
__________________
CptLawrence is offline   Reply With Quote
Old 25-10-2014, 04:00   #6
Registered User
 
DumnMad's Avatar

Join Date: Mar 2012
Location: Nelson NZ; boat in Brisbane
Boat: 45ft Ketch
Posts: 1,246
Re: Suggestions for a diesel day tank.

If its only the seams that are suspect maybe its repairable.

Its ss and with a bit of residual stress around the welds or bends the weakness may be very local.
Away from the stress points it may be very sound.
__________________
DumnMad is offline   Reply With Quote
Old 25-10-2014, 06:55   #7
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Suggestions for a diesel day tank.

Thanks guys, a few very good suggestions for me to follow up there.

Matt
__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is offline   Reply With Quote
Old 25-10-2014, 07:01   #8
Registered User

Join Date: Oct 2014
Posts: 70
Re: Suggestions for a diesel day tank.

Mate, $400 is not too bad for something that will last you another 30 years...
Check around some of the wreckers yards, you may pick up an old tank there that just needs a cleanout?
You wouldnt be able to ship anything half decent from anywhere for less than $400.
__________________
Coxswain is offline   Reply With Quote
Old 25-10-2014, 07:23   #9
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Suggestions for a diesel day tank.

Quote:
Originally Posted by Wotname View Post
Why are the poly tanks suspect that you have seen?
Sort of flimsy looking in the photos, and the threaded sockets for the various fittings look to be made of a separate material, making me worry that they will start to leak themselves. Might be paranoid, but that's the difficultly shopping on the web, hard to get a sense of the quality sometimes. At least with the $400 SS tank I could pick one up and have a good inspection, got to say I was not impressed though.

M
__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is offline   Reply With Quote
Old 25-10-2014, 07:25   #10
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Suggestions for a diesel day tank.

Quote:
Originally Posted by CptLawrence View Post
A fuel bladder can be put in the tank, might have to remove a baffle or imperfections that would puncture or wear on it. Rig a jerry can if in a pinch.
Yes, using the jerry for now, but I don't think I'd like to go open water with the current arrangement.

Had some nasty experiences with bladder tanks, has put me off them, might be silly of me, but I would never relax about it.

Matt
__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is offline   Reply With Quote
Old 25-10-2014, 07:28   #11
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: Suggestions for a diesel day tank.

Quote:
Originally Posted by DumnMad View Post
If its only the seams that are suspect maybe its repairable.
.
Yep, checking out Boden36's suggestion now. Looks to be some decent sealants I can pour into the tank. They are cheap so I reckon they are worth trying first. Luckily the tank is very easy to remove and refit.

I think the construction of the tank is such that any attempt to reweld or braize the leaking area would just cause the next section to start leaking, so a liquid sealant will be more likely to work.

M
__________________
Very funny Scotty, now beam down my clothes.
http://www.swansonsailor.id.au
GILow is offline   Reply With Quote
Old 25-10-2014, 07:55   #12
Registered User

Join Date: May 2011
Location: Pensacola, FL
Boat: 1969 Roamer ChrisCraft, Riveria, 46'
Posts: 126
Re: Suggestions for a diesel day tank.

I used poly tanks for my daytanks without issue. The wall thickness even allows for tapping in your own fittings, which I did for the transfer pump line between primary storage and the day tanks. The only time I had a preinstalled tap fail on a poly tank where the weld around the plug holdining the tap failed was on my holding tank where there was stress applied to the fitting by having too tight a bend in the sanitation hose. Won't make that mistake again.

Sent from my SM-P600 using Cruisers Sailing Forum mobile app
__________________
neptunesjester is online now   Reply With Quote
Old 25-10-2014, 09:10   #13
Registered User
 
sailing mike's Avatar

Join Date: Nov 2009
Location: France
Boat: Bavaria 44
Posts: 17
Send a message via Skype™ to sailing mike
Re: Suggestions for a diesel day tank.

Why not have the tank re welded? It is no problem to Tig weld a s/s tank which has held diesel in it. Providing the welder knows what he is about. I have re-welded many tanks large and small....

Best regards

Mike on the sailing vessel Captain O'Brien


Sent from my iPad using Cruisers Sailing Forum
__________________
sailing mike is offline   Reply With Quote
Old 25-10-2014, 09:18   #14
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: 17,767
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: Suggestions for a diesel day tank.

repair what you have as replacements all suck.
ask me how i know.
do not use poly tank as isnt the optimal size and shape for hold and will cause troubles. ask me how i know that one also...lol
fix what you have. i wish the po had done that with this boat.
zeehag is offline   Reply With Quote
Old 25-10-2014, 09:56   #15
Registered User
 
nimblemotors's Avatar

Join Date: Apr 2011
Location: Sacramento, California
Boat: Solar 40ft Cat :)
Posts: 1,557
Re: Suggestions for a diesel day tank.

What issue did you have with bladder tanks, as I plan to use them.


Quote:
Originally Posted by GILow View Post
Yes, using the jerry for now, but I don't think I'd like to go open water with the current arrangement.

Had some nasty experiences with bladder tanks, has put me off them, might be silly of me, but I would never relax about it.

Matt
__________________

__________________
JackB
MiniMPPT Solar Controller
nimblemotors is offline   Reply With Quote
Reply

Tags
diesel

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel Day Tank Rhapsody-NS27 Engines and Propulsion Systems 11 01-07-2013 11:05
Diesel Fuel Tank vs Portable Diesel Fuel Cell GaryMayo Engines and Propulsion Systems 11 13-11-2012 16:47
Diesel Tank Configuration (Sublevel Tank no.2) erasmos Engines and Propulsion Systems 2 14-04-2011 14:57
Day tank for diesel fuel rigormortis Engines and Propulsion Systems 5 05-08-2008 12:33



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:19.


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.