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Old 25 January 2014, 17:34   #11
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I'd go for a couple of 12 litre tanks. Easy to carry to the pump.

With our Avon SR4.0 / 30hp Yam 2 stroke, its kept on the river and used for short trips and the occasional trip to Cowes. I didn't really know how much it used and went with a full 22 litre tank and two full 12 litre tanks for the trip from Hamble to Portsmouth, round Portsmouth and then back to Hamble, about 40 miles I think.
Used 17 litres.

Small boats don't use as much as you imagine.

Hope that helps.
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Old 25 January 2014, 17:57   #12
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[QUOTE="Searider;596251"]I'd go for a couple of 12 litre tanks

thanks for more answers guys..
I took on board what's been said earlier and now..
I'm going for the two 12's.. one down and one and one to go..
but biding my time on that well known auction site for a bargain..
not sure whether it's the Scottish or the Yorkshire blood in me that doesn't like to dip too far into my pocket!!
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Old 25 January 2014, 18:05   #13
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I agree :-)
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Old 25 January 2014, 19:21   #14
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My golden rule for boats is 1 litre of fuel per horsepower. It works for the kind of boating I do. A 12 litre tank and another to swap certainly sounds like a good idea to me.

It would be great to update this forum when you have used the boat for a while as feedback.
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Old 25 January 2014, 19:30   #15
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Quote:
Originally Posted by kubcat View Post
My golden rule for boats is 1 litre of fuel per horsepower. It works for the kind of boating I do. A 12 litre tank and another to swap certainly sounds like a good idea to me.
Thinking about that. It sounds like an excellent rule of thumb!
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Old 26 January 2014, 08:39   #16
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I learned to use the rule of thirds after coming home on fumes once. One third out, one third back, and one third in reserve for times coming back got hairy. The times we dipped into that last third are not good memories and were generally wet rides with white knuckles.
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Old 26 January 2014, 08:43   #17
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I learned to use the rule of thirds after coming home on fumes once. One third out, one third back, and one third in reserve for times coming back got hairy. The times we dipped into that last third are not good memories and were generally wet rides with white knuckles.
That's ok if you have a definite planned route though :-)
Also my dad had a phantom called 'white knuckles' brings back many memorable times!!
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Old 28 May 2014, 11:33   #18
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Originally Posted by 0ldbloke View Post
Hi Guys..
have read the forum for quite a while but don't post often..
I would like some advice on which size fuel tank I need..
my outboard is a late 90's 2s Mariner on a 4m Honwave..
I haven't used the engine enough to know what sort of consumption I can get from it yet..
the usual use for the boat is weekend fishing.. day and overnight.. and some playtime of course!!
no particular area .. I vary from Plymouth to Scarborough coastline wise
I have a 30l hulk tank which came with the engine.. but am thinking I won't ever use as much on a weekend..
I'm more than happy to carry a smaller tank and have a spare fuel container either onboard or ashore..
or is it simply the case I'm showing my inexperience by not being happy with what I've got..
it's just I am always aware.. size isn't everything!! :0#
Heres a little indicator I had a honwave 3.5 with a15hp 2stroke.Went from Brixham all the way to Blackpool sands, back to Dartmouth and up the estuary back to Brixham .Started with a12ltr and a 5ltr got back with still a 3rd left in the 12ltr tank that must be getting on for 15 miles if that is any good
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Old 28 May 2014, 13:18   #19
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Will dependd entirely if making long or short outings and available sib space. Have been outing for years with 6 gal tanks factory delivered with engine, but my usual "long" outing just consumes max 2.5 gal.

With that amount my 18 HP can make + 60 Km cruises at around 1/2 -3/4 throttle perfect plane and max 1 extra mate on flat calm no wind sea conditions. So planning to change my 6 gal tank to a smaller 3 gal tank in a short time period as never fill my 6 gal tank fully.

Usually buy fresh fuel for that outing and try to consume it all, leftovers are near forbidden, ethanol issues.

Happy Boating
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Old 28 May 2014, 13:36   #20
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I always work on the well known rule of 10% of hp in gallons per hour at WOT - ie for a 15hp 2 stroke max consumption is 1 1/2 gallons or 6.75 litres an hour.

Our last day out we did 38 nm. Max speed was 19 kts but mostly crusing around 15 kts, actual moving average (including all the pootling about) was 9.5 kts over the 4 hours.

Used about 16 litres so 4 litres an hour which is nicely within the 6.75 litres and allows plenty of safety margin.

I use a RNLI flexi bladder which is a great solution if you can find one - it sits in the dead space on the side of a SIB, is lightweight and can be filled up to 30+ litres if you need to. We fill it up for a longer journey with say 20 litres or for shorter trips say 12 litres and re-fill if going out again after lunch.
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