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Old 07 August 2006, 17:47   #1
Country: UK - England
Town: London
Make: Solent
Length: 6m +
Engine: Mercury 150 Optimax
Join Date: Feb 2005
Posts: 13
optimax water in fuel

150 optimax water in fuel sensor warning. Any advice on what to check? Advice please!

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Old 08 August 2006, 03:45   #2
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Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
If it's the same as the larger ones there is a large cast aluminium fuel resevoir on the left (port) side of the engine, the bit underneath with a pipe on it should be the bleed for the resevoir and the water will be at the bottom - if in any doubt at all consult the manual or a trained engineer!
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 08 August 2006, 05:21   #3
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,775
the water sensor is fitted (screwed) into the bottom of the engine fuel filter. This looks like a smaller version of a car oil filter and is obvious when you lift the cowl.

The sensor will alarm if it becomes disconnected (fail safe i guess) so check that first (experience) otherwise drain or change (prefer to change) this filter.

They are expensive (30 odd) but its worth having a spare on board if you do long trips like i used to.

Oh, if you do buy a spare wrap it well or they go rusty and you throw away 30 of rusty filter (also experience)
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Old 09 August 2006, 02:22   #4
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Country: UK - England
Town: River Hamble
Length: 6m +
Join Date: Oct 2005
Posts: 726
Just be careful to get all the water out and find out how it got in there, the injectors on to Optimax are very susceptible to water and they are a arm and a leg to replace
Phone: 01489 556800
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Old 09 August 2006, 08:36   #5
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
If your getting water up that far you really should invest in a Transom mounted (external) water seperator. Not very expensive you can get them from your local Mercury/Mariner dealer. That way the water will get trapped in it before it gets to your engine. And you can see whats in the filter as they have a clear bowl on the bottom so you can drain it out when ever you need to.
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Old 09 August 2006, 13:54   #6
Country: UK - England
Town: cornwall
Boat name: nothing
Make: rib eye 430
Length: 4m +
Engine: tatsu 50
MMSI: 666
Join Date: Mar 2006
Posts: 1,914
does any one ever use fuel aditives to sort water problems like Wynns dry fuel .
I think the US have a version called sea foam

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