Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-07-2015, 10:06   #1
Registered User

Join Date: Jul 2011
Location: Atlantic ICW 29N/81W
Boat: Beneteau Oceanis 36CC, now sold
Posts: 817
outboard fuel tank bulges in sun

We have a Mercury 9.9hp 4 stroke motor on our RIB tender and it has a 3 gallon fuel tank that blows up like a ball in the sun. The original one that came with the motor cracked and leaked an West Marine, who suppliedthe motor, replaced it with one of theirs, which so far hasn't cracked but sure gets expanded. What do others do about this please, we carry our RIB in davits and the tank is left strapped in place? We still have an older style 6 gallon tank that came from a 2 stroke 9.9 Mercury we replaced, will this work with the 4 stroke engine or even could we perhaps just swap the vented cap on that one with the non-venting one on the current tank.

This strikes me as a legally mandated environmental 'improvement created mess that was ill conceived
__________________

__________________
Robin3 is offline   Reply With Quote
Old 07-07-2015, 10:41   #2
Registered User

Join Date: Nov 2013
Location: Belgium
Boat: One-off Baron von Hoevell, 29ft steel classic
Posts: 334
Re: outboard fuel tank bulges in sun

This is perfectly normal, to a certain extent... If you slightly undo the cap, it should just hiss a little and after a while retake its normal shape.

Too much is too much though... Haven't ever heard about one exploding, but if it starts to look more like a ball than a fueltank, look into it.

It's heat related btw, but you probably figured that out by now too . Try covering it in some insulating material? Or taking it inside/out of the sun in any way?
__________________

__________________
Orchidius is offline   Reply With Quote
Old 07-07-2015, 10:42   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,335
Re: outboard fuel tank bulges in sun

Sew a tank cover from white sunbrella.
__________________
donradcliffe is offline   Reply With Quote
Old 07-07-2015, 10:46   #4
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,351
Re: outboard fuel tank bulges in sun

Wouldn't you love to set that bulging tank on a regulators desk and ask if that feels safe to them? Tell him not to worry if it starts to leak. Remind him that, like on a boat, if it starts to leak he has to stay there with it. Tell him it's OK to smoke; boats have ignition sources too and they never blow up due to gasoline leaks.
__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is online now   Reply With Quote
Old 07-07-2015, 10:51   #5
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,371
Re: outboard fuel tank bulges in sun

Quote:
Originally Posted by thinwater View Post
Wouldn't you love to set that bulging tank on a regulators desk and ask if that feels safe to them? Tell him not to worry if it starts to leak. Remind him that, like on a boat, if it starts to leak he has to stay there with it. Tell him it's OK to smoke; boats have ignition sources too and they never blow up due to gasoline leaks.

Crack the fill cap a bit if it doesn't have a vent.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 07-07-2015, 11:09   #6
Registered User

Join Date: Jul 2011
Location: Atlantic ICW 29N/81W
Boat: Beneteau Oceanis 36CC, now sold
Posts: 817
Re: outboard fuel tank bulges in sun

Quote:
Originally Posted by Cheechako View Post

Crack the fill cap a bit if it doesn't have a vent.
I have done that of course a couple of times, but always tightened it again before leaving the boat in the slip in case fuel leaked into the RIB. I have in mind putting a car windscreen sun shade over it too. However if the old tank is a valid option it would be a much tidier solution, even if contrary to the latest EPA (?) rules
__________________
Robin3 is offline   Reply With Quote
Old 07-07-2015, 11:23   #7
Registered User

Join Date: Nov 2005
Location: 5 Mile River
Boat: Bristol 41.1 Keep on Dancin'
Posts: 539
Re: outboard fuel tank bulges in sun

i asked about compatibility yesterday with no response. Aparrently there are new fittings that are OEM that can't be used with older tanks and hoses, but, it appears that after market, replacement fittings will allow new engines with old tanks and vice versa. I would make sure the fittings are the same, and if so, switch the tank. I am trying to find if I can get a new hose to fit my old tanks and 2 stroke motor for just that reason, and the bulb is starting to loose flexibility. The new tanks and hoses are made of a less permeable material so vapors don't leach out, and so the tanks won't split. Guess your experience should send them back to the drawing board.
__________________
keepondancin is offline   Reply With Quote
Old 07-07-2015, 12:16   #8
Registered User

Join Date: Jul 2011
Location: Atlantic ICW 29N/81W
Boat: Beneteau Oceanis 36CC, now sold
Posts: 817
Re: outboard fuel tank bulges in sun

Quote:
Originally Posted by keepondancin View Post
i asked about compatibility yesterday with no response. Aparrently there are new fittings that are OEM that can't be used with older tanks and hoses, but, it appears that after market, replacement fittings will allow new engines with old tanks and vice versa. I would make sure the fittings are the same, and if so, switch the tank. I am trying to find if I can get a new hose to fit my old tanks and 2 stroke motor for just that reason, and the bulb is starting to loose flexibility. The new tanks and hoses are made of a less permeable material so vapors don't leach out, and so the tanks won't split. Guess your experience should send them back to the drawing board.
I have not tried yet but it looks like the hose I inherited with the old tank ( it has quick type connectors at both ends) and it's associated defunct engine would fit the new engine, the connector does look identical to the engine end one on the new tank, where the tank end is a fixed screwed in fitting , The old tank is currently empty and I retained it only as a potential spare and possible storage for extra outboard or fuel for our small 1KW Honda generator. I can check the hose to engine connection easily enough next time on board and hopefully if that is OK then the tank will work if I put fuel in it. Obviously it will not have the pressure release gizmo in the fuel line that the new tank/hose has but It still seems it might be a better solution than keeping a gas filled football that slips it's restraining straps and rolls around the dinghy floor every time it expands in the sun ( temps here running daily around 95F )

I really do not want to have to store the existing tank below decks out of the sun, nor in a cockpit locker or lazarette.
__________________
Robin3 is offline   Reply With Quote
Old 07-07-2015, 15:14   #9
Registered User
 
FamilyVan's Avatar

Join Date: Nov 2014
Posts: 1,779
Re: outboard fuel tank bulges in sun

This is an awesome post. Open the vent.

Sent from my SGH-I547C using Cruisers Sailing Forum mobile app
__________________
FamilyVan is offline   Reply With Quote
Old 07-07-2015, 15:23   #10
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,458
Images: 69
Re: outboard fuel tank bulges in sun

Yep, just loosen the vent a little. They're pretty good a letting the vapour out, while keeping the liquid in.
__________________
44'cruisingcat is offline   Reply With Quote
Old 07-07-2015, 15:24   #11
Registered User
 
Capt.Alex's Avatar

Join Date: Jan 2013
Location: Somewhere in the Bahamas
Boat: Hylas 46
Posts: 308
Re: outboard fuel tank bulges in sun

Quote:
Originally Posted by FamilyVan View Post
This is an awesome post. Open the vent.

Sent from my SGH-I547C using Cruisers Sailing Forum mobile app
FYI...The new generation of EPA approved outboard tanks do not have vents. Its best to be informed before posting snarky replies.
__________________
Capt.Alex is offline   Reply With Quote
Old 07-07-2015, 15:53   #12
Registered User

Join Date: Jul 2011
Location: Atlantic ICW 29N/81W
Boat: Beneteau Oceanis 36CC, now sold
Posts: 817
Re: outboard fuel tank bulges in sun

Quote:
Originally Posted by FamilyVan View Post
This is an awesome post. Open the vent.

Sent from my SGH-I547C using Cruisers Sailing Forum mobile app
Would that be the vent that the new EPA regs had cause to be removed? If you can find one on my new style tank , I'll gladly open it.
__________________
Robin3 is offline   Reply With Quote
Old 07-07-2015, 15:55   #13
Registered User
 
FamilyVan's Avatar

Join Date: Nov 2014
Posts: 1,779
Re: outboard fuel tank bulges in sun

Yikes, good thing I'm not in the state's- gas tanks with no vents. No doubt you can vent them by cracking the lid.

Sent from my SGH-I547C using Cruisers Sailing Forum mobile app
__________________
FamilyVan is offline   Reply With Quote
Old 07-07-2015, 16:01   #14
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2012
Location: Long Beach, CA
Boat: Tayana Vancouver 42
Posts: 1,854
Re: outboard fuel tank bulges in sun

If you leave the full cap loose you can get water in the gas (particularly with ethanol) from humidity.


S/V B'Shert
__________________
Tayana42 is offline   Reply With Quote
Old 07-07-2015, 16:14   #15
Registered User

Join Date: Jul 2011
Location: Atlantic ICW 29N/81W
Boat: Beneteau Oceanis 36CC, now sold
Posts: 817
Re: outboard fuel tank bulges in sun

Quote:
Originally Posted by Tayana42 View Post
If you leave the full cap loose you can get water in the gas (particularly with ethanol) from humidity.


S/V B'Shert
That is a good point if we do decide to go back to the old tank which does have a vent screw in the filler cap, although luckily our home marina fuel supply is still ethanol free
__________________

__________________
Robin3 is offline   Reply With Quote
Reply

Tags
fuel, fuel tank, outboard

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
For Sale: Outboard fuel tank and hose roberttigar Classifieds Archive 0 18-06-2013 04:21
Small Outboard Fuel Tank Carver Power Powered Boats 5 27-09-2012 10:22
convert a 20l outboard fuel tank to inboard ewanfish Engines and Propulsion Systems 0 04-07-2011 06:52
Rebuilding Outboard Fuel Tank b-rad Auxiliary Equipment & Dinghy 2 12-02-2010 12:13
Jeanneau Sun Odyssey vs Sun Fast hoppy Monohull Sailboats 1 20-09-2009 12:14



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 00:07.


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.