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I have a refurbished 1988 17" Montauk with a new 70hp Yamaha. I want to mount a water/fuel separator filter.
where would be the best place????

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On my 1987 Montauk, I installed mine on the inside of the transom wall, right below motor.

https://picasaweb.google.com/11004423...5541953650

Some install it on the forward face of the spashwell but I think it is prone to being being in the way.

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Hello,
In my 1988 Montauk 17 with a Yamaha F70LA, I mounted this filter on the starboard side of the splashwell, right under the rigging bundle:

https://www.fisheriessupply.com/racor...025-rac-02

This put it out of the way of banging crab pots and other gear. I really like the small size of this particular filter, although it is a bit pricey. The 10u filtering element is also recommended by Yamaha for the motor (or at least it was in 2011).

Dennis

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Thank you both. Have either of you had problems with the filter when the splash well fills with water?

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I've never had my splashwell fill with water to the level that the filter is mounted. I doubt that it would be a problem, as since no gas leaks out I'm not sure how unpressurized sea water could get in. The housing itself is anodized aluminum with a plastic filter bowl, so it doesn't mind saltwater.
Dennis

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No problems.

In hindsight, I would go with the smaller version of filter. I installed this on my Outrage 17

http://www.simyamaha.com/Yamaha_Fuel_...-lt-as.htm

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Thanks again to you both. Filling the splash well has only happened in rough seas , reverse and some large person climbing in on the swim/ladder platform I have mounted to the transom port side.

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I welded a bracket for the filter and attached it to the back of one of my two fuel tanks under the RPS. It does take up some space behind the seat but I wanted to save drilling some new holes as I was on the fence of exactly where to place it.

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I have mine in the splash well. The water/fuel separator is totally sealed to keep fuel in and therefore keep any water out. In the splash well it is out of the way and easy to change.

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Great help, thanks Guys.

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When I recently refurbished my 1996 Montauk 17, I moved the water separator from outside and in front of the splashwell, to the interior just below the engine. Very pleased with this arrangement, so glad to see a few advocates.

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You mention it's a new Yamaha 70. Does your motor have an on engine water/fuel separator? If it does I would not bother with a separate filter. With small above deck tanks there shouldn't be much need for it.

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I said new. I refurbished the Montauk back in 2012 and put the new motor on then. I also put a new Moller fuel tank in. first two years ran great. I always have put pure gas in. Last two years I have had a few issues with the injectors althought I have changed the fuel filter on the motor every year and doubt I have run it more than 25 to 30 hours each summer. I have continued to crank it a minimum of every week since the beginning. I'm in south Alabama and it's quite humid down here. maybe condensation collected in the tank.

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The F70 does have a built in fuel filter. I look at the big filter as insurance. The in-line filter has 10 micron filtration. Might help with injectors. Also, it is possible you could get some condensation in the tank especially in a humid area. The above deck tank will be exposed to the sun and could have a larger temperature swing. Good luck on your decision and happy boating.

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My Yamaha F70LA manual states an external 10u filter is recommended. I had a couple of instances of clogged injectors prior to installing one. It could very well have been my fault, as I initially used white teflon tape to secure fittings on my tanks. Subsequent to replacing the tape and adding the filter referenced above (3 years and ~150 hours ago), I have never had a failure. It is relatively cheap insurance.

I have never seen any water in the external or internal filters. I run regular 10% ethanol gas from the gas station exclusively.

Dennis