Outboard with 25L tote tank water in fuel?

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    Posted: 20 Jul 2014 at 10:42am
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Had my 2006 50HP Mercury 2 stroke outboard serviced this month - uses 25L tote tank with oil injection so not premixed , I use 95 octane on advice of mechanic (better quality fuel). At service it was noted that there were traces of water in fuel pump and some water in inline fuel filter but apparently not much in tank - he cleaned out carbs as a precaution after replacing fuel filter. Boat does not have a separate water separator but has standard inline fuel filter after fuel pump and before carbs under engine cover. I had noticed trip before service engine missed a bit while warming up (normally once running evenly does not miss at all). Could have caused real problems soon! Tank is stored under seat so not in a wet location. I am puzzled by this as always careful - I top tote tank up after each trip (to minimise air space and so reduce condensation), boat is stored under cover (in carport)).
How can I minimise water in fuel? Should I fit an external water separator between tote tank and outboard? Can you recommend one? As boat 7 years old now this amount a water may be normal buildup?
I remember in my motorcycling days a long time ago I use to add meths (300ml or so to a tank) to pick up water and burn off running engine - can I do this with this outboard? Other option is to empty tote tank contents yearly and check for water?

How long should 95 octane fuel be stored for before going off? I use boat regularly all year never more than a month between trips and use 10-15 litres each trip minimum.   I also carry a jerry can with spare fuel in boat and empty and replace this every 3 months or so at present.

Good fishing trip nothing breaks, great trip catch fish.
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Post Options Post Options   Likes (0) Likes(0)   Quote Tagit Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2014 at 11:33am
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Have you ever used the Gull ethanol fuels in the boat?
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I was told never ever use Gull 98 bio fuel as it is made up of sugar cane husk cardboard etc. when I had a 50hp mariner,advice was to use bp98
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Post Options Post Options   Likes (0) Likes(0)   Quote MacSkipper Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2014 at 2:42pm
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Never used Gull ethanol fuel in this boat - mainly because local fuel station is BP and Mobil.
Good fishing trip nothing breaks, great trip catch fish.
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Post Options Post Options   Likes (0) Likes(0)   Quote catch1t Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2014 at 3:20pm
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similar thing happened to me this last summer. have 2 o/boards/2 totes and water in both.
 
worked it out that I filled up at a different servo (pak n save had 30 cents/litre off) than I normally use.
 
havnt had a problem since then, I only buy gas at our local..
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Post Options Post Options   Likes (0) Likes(0)   Quote red rooster Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2014 at 4:43pm
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ive just been through same thing
put on a water filter separator i got one from FCO for 70 bucks 
just cut the fuel line from tote tank an guled filter to boat 
reminds me i gotta empty tank an check for water [ water will be at bottom so would get sucked up first]
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Post Options Post Options   Likes (0) Likes(0)   Quote red rooster Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 2014 at 11:57am
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just drained tank was maybe a teaspoon or two of water in there.
i dont know anything about gull fuel,  but all the other company's get there fuel from the same tankers [ships] an just add there own additives in there. i do here the agents etc saying the fuel is 'cloudy' at times . . . 
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Post Options Post Options   Likes (0) Likes(0)   Quote MacSkipper Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 2014 at 2:50pm
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My understanding is Gull fuel comes refined from Singapore whereas all other companies come via Marsden point refinery?

When did you last drain fuel tank?

I suspect I am going to have to check mine regularly for water from now on. Picking up boat Wednesday and will ask Mechanic what he recommends re water in fuel and post then.

Cheers
Good fishing trip nothing breaks, great trip catch fish.
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Post Options Post Options   Likes (0) Likes(0)   Quote red rooster Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 2014 at 3:14pm
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drained tank last winter , was all good
i had just suspected i had got water in there from ruff conditions an me splashing around diving 
i store boat in garage an keep tank topped up . . did wonder about condensation with dryer going in garage ?  
yea keep us posted cheers 

edit: i thought the tankers cruise around fueling up everywhere an the big companies eg bp- mobile get the same stuff 
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Post Options Post Options   Likes (0) Likes(0)   Quote MacSkipper Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2014 at 4:01pm
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Picked up boat today and discussed water in fuel with mechanic - he thought may have just accumulated over time.

My thinking as is a tote tank, is to completely empty once a year (or more often if needed) and swill a bit of methylated spirits (absorbs water) in tank and refill. Cheers.
Good fishing trip nothing breaks, great trip catch fish.
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Post Options Post Options   Likes (0) Likes(0)   Quote cossack Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2014 at 1:18am
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Definitely install a fuel filter(screw on type replaceable, change it every year!) between tote and engine!! Don't hesitate to put it on, mount it on the boat, worth it's weight in gold. Had the same prob once and it was pretty embarrassing being towed in. Mine was a case of 1 litre of water in 19 litres of fuel straight from a Caltex pump, no bull! An oxygen line (used one from ambo or nurse/hospital) is a good small diameter clear siphon line to use on the tote to clean water out of bottom now and again.

My understanding is that Z is the only retailer not adding ethanol to 91 octane apparently everyone else does as they get a fantastic hand out from Govt if they do! Tax relief or some such.
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Post Options Post Options   Likes (0) Likes(0)   Quote cossack Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2014 at 1:22am
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Yamalube Fuel Stabiliser & Conditioner Plus additive has been good for me for under floor tank. Little pricey but have had no probs with fuel over 5 months storage. Cleaned up the chainsaw carb too!!
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Post Options Post Options   Likes (0) Likes(0)   Quote MacSkipper Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2014 at 6:19am
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Thanks Cossack interesting about ethanol as it does pick up water and cause issues.
Good fishing trip nothing breaks, great trip catch fish.
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Post Options Post Options   Likes (0) Likes(0)   Quote pjc Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2014 at 8:50am
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sometimes when washing down we forget to close fuel vent on tote tanks,this could be how water gets in,pns fuel is BP so there should be issues there.
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Have just emptied and rinsed my 2 23l totes - was surprised how much crap was in them - including dead flies, cockroach legs and a blackish, cloudy substance which could be water combined with the aforementioned muck?!
Decanted the petrol back into clean jerry can and still have a small amount  of water remaining in the totes due to the shape/design.
Is there a way to speed up the evaporation process before refilling?
Have been reading about adding meths - would water combine and evaporate more easily than by itself?
Obvious option would be leave them in the sun until dry but would like to get it all sorted asap if possible.
Thanks in advance for any advice.

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Post Options Post Options   Likes (1) Likes(1)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 2017 at 7:09pm
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The meths thing.. covered in detail in old threads..
 IF you use the old leaded fuel formula, yep meths will work. The new unleaded.. forget it.
 I dont know about BP, but Mobil, they have ethanol and non ethanol fuels.. depend which mobil outlet you use.
 Mine is non ethanol
 The octane.. using 95  dont you get less energy per liter therefore less economical
 The "95" octane for outboards comes from mechanic who DO NOT realise the octane rating for the USA and couple other counties is different to the rest of the world. There are 2 octane methods.. the USA uses a ave of the 2. This means our 91 is close to their 95/98. Most outboard engine instruction manual mention this...

there were traces of water in fuel pump and some water in inline fuel filter but apparently not much in tank

 
AS mentioned above the pick up is in the bottom of the tank.. so there will only be "some" in the tank.. and will depend just which way the tank/ pick up sits in the boat
 In my books , like other posts above any wet weather/ marine engine used in such conditions on a regular basis NEEDS  a water filter
Not only does it filter other crap out over a very large surface area, prevent crap getting to the much smaller, coarser in engine pre carb filter.

With an under floor tank, when the filter is checked (and cut open) any crap water means the tank is due for a flush  AND the fuel filler cap O ring replaced.
 The same principle applies to a tote ...espec with the point PJC mentions about "when washing down we forget to close fuel vent on tote tanks,this could be how water gets in.."

Put a in line fuel/ water filter in.. once its there is done..forget about crap in engine filter , forget about water issues past the filter and a check will keep an eye on tote tank condition..

You dont need an expensive clear water filter.. simply removing the filter, tipping the contents out, check.... re grease/ oil the seal and replace if suspect anything. Normal service thu replace.
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Post Options Post Options   Likes (3) Likes(3)   Quote like_to_strike Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 2017 at 7:33pm
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Steps - on to it as usual!
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Post Options Post Options   Likes (0) Likes(0)   Quote pjc Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 2017 at 9:06pm
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remove the filter tip out contents?'Steps" I presume you mean replace filter with a new filter?
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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2017 at 8:54am
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No...
If you suspect something, maybe well before next service.. run motor to get it filled up with what ever has settled in the tank... kill motor, unscrerw and tip out.
These marine filters can put thru a lot of contaminat5ed fguel before loosing flow/ blocking up..
Consider the actual amount of fuel/hr on the ave run about actually uses...
 Compare to other commercial similar applications, on land and sea..or a car fuel filter of far smaller size.
We get out way more than most all yr round..about 50/55L per ave trip. 36/40 trips per yr
The amount of fuel most engines put thru over several or more yrs is far less.

 And the same goes for impellers...
Interesting to check the actual service periods of items in service manuals over the 'routine annual service' at local workshop...
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Post Options Post Options   Likes (0) Likes(0)   Quote pjc Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2017 at 3:31pm
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going to the trouble of unscrewing filter and draining water etc why not replace filter at same time they are cheap enough.
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