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09 May 2016, 07:01
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#1
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Member
Country: UK - England
Length: 4m +
Join Date: Oct 2006
Posts: 79
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Design Fault?
I have just finished fitting out a new RIB and would appreciate some advice on the fuel system as I think I must be missing something. There is a built in (under deck) stainless tank with connections for the filler, breather and fuel supply hose at the aft end near the transom moulding and filler cap / breather outlet above the splash well. The issue to me is that the breather outlet is lower than the filler cap so if you fill the tank until the garage fuel pump stops then fuel will exit the breather!? Also when fuel if you park the trailer on any sort of incline again fuel gushes out of the breather?
What am I misunderstanding?
Any help would be grateful received.
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09 May 2016, 07:37
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#2
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Member
Country: UK - England
Town: Bristol
Make: Ribcraft
Length: 5m +
Engine: Yamaha
Join Date: May 2006
Posts: 4,299
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you sure the breather is not the fuel supply and vice versa?
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09 May 2016, 09:00
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#3
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Member
Country: UK - Isle of Man
Town: Peel, IOM
Length: no boat
Join Date: Nov 2000
Posts: 2,511
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Or is the breather outlet meant to connect to a hose which should then rise above to the outside world?
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Brian
"Ribbing-the most expensive way of travelling third class"
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09 May 2016, 09:34
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#4
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Member
Country: UK - England
Town: North Lincolnshire
Boat name: Mary Olwen
Make: Humber
Length: 6m +
Engine: OB, Petrol, 140HP
Join Date: Mar 2007
Posts: 151
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Quote:
Originally Posted by Brian
Or is the breather outlet meant to connect to a hose which should then rise above to the outside world?
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I would suggest this too! Should be vented outside any enclosed space to prevent buildup of fuel vapour.
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09 May 2016, 09:46
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#5
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,067
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Quote:
Originally Posted by Dry_Doc
I would suggest this too! Should be vented outside any enclosed space to prevent buildup of fuel vapour.
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Yep.
I have something called a 'Barton fuel whistle' fitted into my breather line as well.It lets you know when the tank is full.You fit it in the breather line immediately above the fuel tank and it stops whistling when fuel gets to it.
Fuel pump cutoff will be very likely to make a mess, even with a breather higher than the filler cap.
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09 May 2016, 10:19
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#6
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Member
Country: UK - England
Town: London
Boat name: Quench
Make: Fairline
Length: 10m +
Engine: Volvo
Join Date: Aug 2013
Posts: 38
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Quote:
Originally Posted by Nos4r2
Yep.
I have something called a 'Barton fuel whistle' fitted into my breather line as well.It lets you know when the tank is full.You fit it in the breather line immediately above the fuel tank and it stops whistling when fuel gets to it.
Fuel pump cutoff will be very likely to make a mess, even with a breather higher than the filler cap.
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Was looking those up and the picture they have on the website has the breather below the fuel port. I guess it's not such a rare thing on motor vessels in general.
Barton Marine - Products - Fuel whistle
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09 May 2016, 10:58
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#7
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Member
Country: UK - England
Length: 4m +
Join Date: Oct 2006
Posts: 79
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Fantastic! Thanks for all the help and especially the suggestion of the fuel whistle. That should do exactly what I need :-) Here is a pic of the filler port and the tank vent on the far side of the splaswell...
![](https://www.rib.net/forum/attachments/photobucket/img_715152_0_2dff125555856d6cee3b6f7ea26086aa.jpg) [/URL][/IMG]
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09 May 2016, 13:03
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#8
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Member
Country: UK - England
Town: Bristol
Make: Ribcraft
Length: 5m +
Engine: Yamaha
Join Date: May 2006
Posts: 4,299
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you would have expected a pipe to be on it and to be dash mounted on the side somewhere surely??
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Member of S.A.B.S. West Country Division
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09 May 2016, 14:12
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#9
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Member
Country: UK - England
Length: 4m +
Join Date: Oct 2006
Posts: 79
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Well that's my next question really. Having solved to overfilling issue
with the whistle device there is then the fact that all three connections to the tank are at the aft end in a line. This includes the breather tube which surely means when filling the tank with the bow raised there will be air in the forward part of the tank which can't be displaced?
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09 May 2016, 17:18
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#10
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Member
Country: UK - England
Town: Royal Wootton Bassett
Length: 8m +
Engine: 250
Join Date: Jul 2008
Posts: 8,047
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Quote:
Originally Posted by Texel Tom
Well that's my next question really. Having solved to overfilling issue
with the whistle device there is then the fact that all three connections to the tank are at the aft end in a line. This includes the breather tube which surely means when filling the tank with the bow raised there will be air in the forward part of the tank which can't be displaced?
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You should have the breather at the front with the breather tube exiting the console at high level as Matt says
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09 May 2016, 17:35
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#11
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Member
Country: UK - England
Length: 4m +
Join Date: Oct 2006
Posts: 79
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As I say 'design fault'! Tank's in, deck's down, console's in .... It's how it was sadly.
Unless they have extended to vent inside with a tube to the forward section? I'll see how much fuel I can get in....
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09 May 2016, 18:35
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#12
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Member
Country: UK - Scotland
Town: Denny
Boat name: Highland Bluewater
Length: 6m +
Join Date: Mar 2013
Posts: 1,647
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Probably not the HSE approved method of checking you've got them the right way round but if you take the filler cap off (DO NOT DO THIS WITH THE FILLER CAP IN PLACE) and, with a bit of tube blow into the fittings you'll find one blows bubbles (the lift pipe) and one doesn't (the breather.)
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09 May 2016, 19:16
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#13
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Member
Join Date: Jun 2010
Posts: 2,934
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Quote:
Originally Posted by Nos4r2
Yep.
I have something called a 'Barton fuel whistle' fitted into my breather line as well.It lets you know when the tank is full.You fit it in the breather line immediately above the fuel tank and it stops whistling when fuel gets to it.
Fuel pump cutoff will be very likely to make a mess, even with a breather higher than the filler cap.
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sorry for slight hi-jack..........do these work well?
the ribcraft has a terrible design on the overflow as it throws fuel right at your face/onto pump if filling up on trailer, this would stop it if it works well?
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