Reply
 
Thread Tools Search this Thread
 
Old 25 July 2013, 19:02   #1
Member
 
cgf10's Avatar
 
Country: UK - England
Town: Poole
Boat name: Superfly
Make: Shearwater 860
Length: 8m +
Engine: Verado
Join Date: Apr 2009
Posts: 329
Dissappearing Fuel

I have a Yamaha 100hp 4 stroke. Its a great engine but this year I seem to have a strange new problem to solve. The fuel seems to be dropping out of the fuel line and requires pumping with the primer bulb for every single cold\first start of the day. Once started the boat seems perfectly ok to start throughout the day but if I come back the next day I have to reprime the bulb and find the fuel line appears to be totally empty. Anyone else had this issue ?
__________________

__________________
cgf10 is offline   Reply With Quote
Old 25 July 2013, 19:55   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,590
RIBase
You've got a minor air leak in the fuel line somewhere. It might even be at the bulb. Check the connections.

You won't necessarily see a fuel leak from it if it's a tiny leak.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 July 2013, 02:51   #3
Member
 
cgf10's Avatar
 
Country: UK - England
Town: Poole
Boat name: Superfly
Make: Shearwater 860
Length: 8m +
Engine: Verado
Join Date: Apr 2009
Posts: 329
Nos - thanks, in that case I think I know exactly where this is. The gasket between the fuel sender unit and fuel tank has expanded and no longer makes a perfect
seal. I've ordered a new one already so hopefully that will be my problem solved.
__________________
cgf10 is offline   Reply With Quote
Old 26 July 2013, 04:13   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,590
RIBase
I suspect it's not that gasket-unless Ribeye use some very unusual ( and extremely complex) tanks. It's more likely you just need to nip up or reseat a jubilee clip or change the primer bulb. It shouldn't be any drama to sort out.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 July 2013, 05:23   #5
Member
 
boristhebold's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,278
Im slightly confused, I thought it was normal practice to pump the fuel bulb at the start of each days of boating. I have a 200HP Yamaha and always pump the bulb each day I use it.
__________________
boristhebold is offline   Reply With Quote
Old 26 July 2013, 05:39   #6
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,590
RIBase
You shouldn't have to do it for every cold start. You probably don't need to pump it Boris. I don't have to on either boat as long as the fuel line isn't disconnected or a tank runs out.

The way I read the OP's question is that if he doesnt pump, it has to draw fuel all the way from the tank and takes ages to fire up.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 July 2013, 07:51   #7
Member
 
Country: UK - England
Town: London
Boat name: Intercept
Make: Humber
Length: 4m +
Engine: 60HP
MMSI: 235100718
Join Date: May 2011
Posts: 260
We have to pump every cold start, but then we have portable tanks and disconnect the fuel hose every time. So maybe that is the difference?
__________________
vjmehra is offline   Reply With Quote
Old 26 July 2013, 08:10   #8
Member
 
Festinghouse's Avatar
 
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Force/Mercury 120
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,388
RIBase
Send a message via Skype™ to Festinghouse
replace the primer bulb, this has a built in one way valve which often fails allowing fuel to siphon back to the tank. be careful as some bulbs need to 'hang' vertical for the valve to work properly. i had all this trouble a couple of years ago. i also fitted an electric pump which works on a push switch on the side of my console to prime the engine from the helm rather than wading round to the engine - this has proved to work very well.
__________________
"Life may often suck, but the alternative is unacceptable"
MMSI Sticker

Member of S.A.B.S. (Lancashire Division)
Festinghouse is offline   Reply With Quote
Old 27 July 2013, 17:08   #9
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,636
Quote:
Originally Posted by Festinghouse View Post
replace the primer bulb, this has a built in one way valve which often fails allowing fuel to siphon back to the tank.
If the fuel line is sealed up, there should be no way for the fuel to leak back, as the vacuum formed as it receded would keep it there (does that statement actually make sense?).

Someplace has to be letting air into the line to allow the fuel to drain back.

jky
__________________
jyasaki is offline   Reply With Quote
Old 27 July 2013, 17:38   #10
Member
 
Festinghouse's Avatar
 
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Force/Mercury 120
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,388
RIBase
Send a message via Skype™ to Festinghouse
ok, heres an idea, if you have a clear inline filter you will notice that it never stays full, even if you try to fill it prior to connecting the fuel line to the engine. my guess is that the 'air gap' is actually vaporized fuel, and it is the expansion of that which causes the fuel to return to the tank.
i welcome other peoples ideas on this one!
__________________

__________________
"Life may often suck, but the alternative is unacceptable"
MMSI Sticker

Member of S.A.B.S. (Lancashire Division)
Festinghouse is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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




Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 23:35.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.