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Old 19 May 2020, 08:17   #1
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Optimax 225 Fuel Filter

I'm getting everything place ready to fit the(Pre-Loved) 225 Optimax I've purchased to re-engine The Nashers revenge.
It's arriving with me later this week, but selfishly Lady Nasher wants me to fit the new kitchen that's also just arrived before swapping boat engines about

I realise that the Delphi 296 Pre-filter/water separator mounted in the boat that I've had in place for the old DT200EFI probably needs upgrading to something more sophisticated.

Does anyone have any suggestions?

I'd like to consider a twin filter and separator setup that gives the option to swap between the two if required.
It's hidden under the transom cover, so doesn't need to be pretty or particularly small.

Thanks

Nasher

Current, unsophisticated setup:
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Old 19 May 2020, 08:27   #2
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Meant to say I'd rather have something with a clear lower bowl so i can see what's going on if there's any water in there.

The std Merc type one doesn't have a bowl, but I know Yamaha and Suzuki ones do.

Nasher
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Old 19 May 2020, 08:43   #3
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https://www.asap-supplies.com/fuel-s...ansparent-bowl

They do petrol filters with clear bowls and they do dual and duplex but not all at the same time.
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Old 19 May 2020, 08:51   #4
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Thanks GuyC

I've seen it suggested that the Optimax needs a 2 Micron Filter, 10 Micron isn't good enough, but I'm not sure if that's correct.

Nasher
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Old 19 May 2020, 13:07   #5
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https://www.bottomlinemarine.com/pro...ine_4107.shtml

Believe these are for Optimax, it’s what I have anyway
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Old 19 May 2020, 13:15   #6
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Don’t know much about the 225 optimax but my optimax the 2 micron filter is on the fuel vst would expect yours to be the same.
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Old 20 May 2020, 06:10   #7
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Thanks Westcoaster, the Racor ones do appear to be the ones to go for.

I think 'reassuringly expensive' is the phrase I'm looking for.

I can't find anywhere what filter mercury recommend with regards to Particle size, but I've seen plenty of 10 Micron ones advertised as being for Modern Fuel injected Outboards.
Although I suppose the Optimax is not exactly modern these days, despite it being the most complicated Outboard I've ever owned.

Nasher.
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Old 20 May 2020, 08:02   #8
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I under you want a bowl you can see so this probably isnít for you but this is what I am using and hand done for the last few years (not the same filter lol) works fine no hesitation in the throttle at any point Click image for larger version

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Old 20 May 2020, 08:45   #9
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These
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Old 20 May 2020, 13:47   #10
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THIS is what you need

You could easily set up two with suitable valves so you have a quick change-over

https://www.specialistsmallcraft.co....ter-with-drain
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Old 20 May 2020, 16:14   #11
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Remember that some Mercury engines has an accessory link to go to your water filter so the Smartcraft Gauges will alert you to water in your fuel. I think they will also put the engine into the Guardian mode to protect the engine.

If you wanna use this you will need the Racor fuel filters with the screw thread in the plastic bowl.

Chris
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Old 27 May 2020, 08:53   #12
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This is an interesting topic - you have now prompted me to check what filter system i have on my boat next time i visit!!

I have a (new to me) 2004 Mercury 225 Optimax that came with my boat last year, so i'm learning fast about these engines. They are superb but clearly require a lot of care and very particular maintenance.

I found a USA forum (bbcboards.net) with a lot of very comprehensive advice on these motors, its worth a few hours of reading on points to watch, check, vital maintenance etc. and a service manual (not cheap) is essential if you want to look after most of it yourself.
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Old 27 May 2020, 09:10   #13
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I'm still waiting for mine to arrive, then I have to fit it, but I've promised Lady Nasher I'll fit her new Kitchen first.

I am however trying to gather everything together so I'm not held up when I do fit it.

Nasher
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