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Author Topic:   Where to mount F/W separator on 15?
PMUCCIOLO posted 04-11-2003 12:47 AM ET (US)   Profile for PMUCCIOLO  
The 15' classic hull I had built with the GLS II interior is going to have its power installed next week. The deal includes a fuel/water separator. Where should it be installed?

I was going to suggest on the front edge of the splashwell, directly over the small sump into which the deck drains. Any thoughts?


David Jenkins posted 04-11-2003 03:42 AM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
I think that further aft would be less in the way, and higher would reduce the chance of water getting in the fuel should the boat ever become swamped.
Florida15 posted 04-11-2003 10:01 AM ET (US)     Profile for Florida15  Send Email to Florida15     
I don't have one on my 15' but I saw one a few weeks ago that did. He had his mounted
to the right of the motor on the transom.
If you mount it on the front of the splashwell, I think it will eventually get in the way.
Chap posted 04-11-2003 10:40 AM ET (US)     Profile for Chap  Send Email to Chap     

If your imbedded "wood" is similar, position J and L from the Reference Wood Diagram may be options as well.


hooter posted 04-11-2003 10:52 AM ET (US)     Profile for hooter    
This one's been bandied about in the past, so here's the summarized results. Only reason to use a separator is with an internal fuel tank, end of story. Over time, these will collect condensed water that needs to be removed before runnin’ to the engine. No reason whatsoever you can't pick up a portable tank and empty the dregs into your lawn mower ever six months or so, so you never have much if any accumulated condensation in them. Space is at such a premium in a 15', why stick unnecessary gear on it? But then some fellers wear a belt and suspenders.
PMUCCIOLO posted 04-11-2003 11:01 AM ET (US)     Profile for PMUCCIOLO    

The boat has a 15 gallon Pate fuel tank which is mounted beneath the rear seat. The likelihood of my removing the tank, inverting it to drain, and replacing it is about as close to zero as one can get.

I appreciate everyone's input thus far! Thanks.


First Thought posted 04-11-2003 12:31 PM ET (US)     Profile for First Thought  Send Email to First Thought     
I have mine mounted on the front of the splash well in my Montauk. It has been there for 5 years and it has never been a problem. Just make sure you leave enough slack in the fuel line to allow full motor travel.
First Thought
hooter posted 04-11-2003 01:59 PM ET (US)     Profile for hooter    
If that Pate tank is more or less permanently mounted, then Ah may stand corrected, in this instance. A simple li'l in-line filter would very likely still do the job just fine.
lhg posted 04-11-2003 02:32 PM ET (US)     Profile for lhg    
Like Hooter and others, I believe a water separating fuel filter is overkill clutter for an above deck tank, and especially in a relatively warm climate. It's the large capacity, below deck aluminum tanks that can collect condensation during larger temperature/humidity swings, most often associated with cold temps in northern climates, and during prolonged storage, and only for partially full tanks.

As an alternative, if you're concerned about dirt in the fuel, one of those little Tempo in-line filters sounds reasonable to me, as suggested. If you're really concerned about
condensation in a partially full 15 gallon tank (I would not be!), then a few drops of MDR "Waterzorb" emulsifier (contains no alcohol)would do the trick. A $10 bottle treats 300 gallons of gas. Dri-gas also works, although it adds alcohol, but in a non-aluminum tank, that doesn't matter.

Above deck tanks all have vented caps which can be closed, preventing water vapor from entering during non-use. With a built-in tank, the vent is continually open, and quite large, so water vapor easily enters.

Bigshot posted 04-11-2003 02:34 PM ET (US)     Profile for Bigshot  Send Email to Bigshot need for a water seperator with an above deck tank. An above deck tank does not sweat being there is no cold water under it. If you insist on one I would mount it to the Pate itself. You will obviously have to do this BEFORE gas is installed. If you mount it to the splashwell and the boat floods, water can get into the filter.....not good. If the filter rusts the rust will get into the carbs.....not good. More of a pain than it is worth. if ya ever do get water in your tank, can of drygas is a lot cheaper at $.79.
First Thought posted 04-11-2003 02:43 PM ET (US)     Profile for First Thought  Send Email to First Thought     

You may be right. All I know is that in my experience I have seen a awful lot of boats with above deck tanks that had continous problems with water in the fuel. One of those people was me more than once in my 13 with a Tempo 18 gal tank, and my boat avrages over a hundred days a year in use. Ever since I have been using a water fuel filter, on two boats now I have had zero fuel water problems, to me they are more than worth it.

First Thought

PMUCCIOLO posted 04-11-2003 03:01 PM ET (US)     Profile for PMUCCIOLO    
lhg and Bigshot,

Is there any risk of debris in the gasoline, or should the primary concern be water?


Bigshot posted 04-11-2003 03:13 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Engine has a built in filter on it. You can then add an inline filter for about $6(which i do). These 2 filters will keep 99% of all debris out. The water seperator mainly takes out water....and some debris.
Kelly posted 04-11-2003 03:24 PM ET (US)     Profile for Kelly  Send Email to Kelly     
Bigshot, hooter, & lhg,

Do you think it makes any difference with a fuel injected motor vs an old carburetor motor? Bigshot, do you use any kind of filter on the Johnsuki? It seems like I heard someplace that the injected models recommended filters.


lhg posted 04-11-2003 05:01 PM ET (US)     Profile for lhg    
My Mercury 200 EFI's have their own engine mounted water separator, which is also alarmed, so I assume EFI engines are more sensitive to water in the fuel. I think all have their own on-board filter, so nothing else would be needed.

Am I correct that all of the new Whaler 130, 150 and 170's come with fully factory rigged engines, but WITHOUT water separating fuel filters? WHY, because they are not needed. But all of the larger Whalers with factory rigged engines and built-in tanks come factory rigged WITH water separating filters.

PMUCCIOLO posted 04-11-2003 06:54 PM ET (US)     Profile for PMUCCIOLO    

Should I consider the Pate tank "permanent," as it cannot be [easily] removed and emptied of contaminants as the portable 6.6 gallon tanks used on the models you describe can?

Do owners of other Boston Whalers which are similarly equipped (with Pate or other fuel tanks of the like) use fuel/water separators? I thought that installation of the fuel/water separator was sound advice from the dealer, as all of the Montauks my family has owned with Pate 27 gallon tanks had fuel/water separators installed.

Does the volume of the tank (15 gallons)contribute to the necessity (or the lack thereof) of the fuel/water separator?


RWM posted 04-11-2003 10:19 PM ET (US)     Profile for RWM  Send Email to RWM     
When I installed my 70 HP Evinzuki 4-stroke with sequential multiport fuel injection I was concerned about dirt getting into the injectors. Historically with carbed engines and on deck tanks I've used the Tempo in-line filter but was not completely satisfied. It filtered out dirt fine, but... That filter sometimes leaked, I've had it come apart on me underway, and once the glass broke spilling gas all over. Perhaps I've been too rough with it since Tempo seems to sell a lot of these, and that's what people talk about for in-line filtration.
Anyway I installed a Racor 320 on the front of the Montauk splashwell and it has worked fine for 2 years. No leaks, no dirt, water either!
So I'm dropping $20 each year on a new filter, plus the maintenance hassle each spring when I bring the boat out and each fall when I winterize it.
I'm considering going back to the Tempo and being a little more careful with the installation and handling.
Has anyone else had a problem with the Tempo in-line filter leaking, breaking, or coming open? Is there a better in-line filter? Thanks for your advice...Bob M.
RWM posted 04-11-2003 10:21 PM ET (US)     Profile for RWM  Send Email to RWM     
P.S. I have a 28 gallon Tempo tank.
PMUCCIOLO posted 04-12-2003 10:38 PM ET (US)     Profile for PMUCCIOLO    

How does the front of the splash well over the sump sound? The fuel line can be diverted from the rigging tube to the F/W separator and routed back up to the engine very smoothly. (An OEM Yamaha F/W separator is being installed.)



First Thought posted 04-14-2003 11:00 AM ET (US)     Profile for First Thought  Send Email to First Thought     
That is where I have mine mounted. It makes a clean mount that is not in the way and is easy to change the filter.
First Thought
63WHALER posted 04-28-2003 05:43 PM ET (US)     Profile for 63WHALER    

Was curious if and where you mounted the F/W separator on your 15. Was thinking about installing one also or maybe just an in-line filter but I just like the added insurance of combo. F/W.
The most likely area like you had mentioned I think is on the front of the splashwell.
I have 2 portble tanks in rear of boat.

David Jenkins posted 04-28-2003 08:30 PM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
I had a Tempo in-line filter on my last boat and it caused nothing but problems. It is just something else that can (and will) break, possibly leaving you stranded.
PMUCCIOLO posted 04-28-2003 08:37 PM ET (US)     Profile for PMUCCIOLO    
The fuel/water separator was mounted on the inside of the transom to the right of the engine. It made a very clean installation, and it works well.


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