Water separating filters

Mark42

Fleet Admiral
Joined
Oct 8, 2003
Messages
9,334
As part of putting in a permanent fuel tank in the Capri I check out all kinds of filters. I specifically wanted a water separating filter with a clear bowl so I could SEE if water was collecting in the filter. I was going to go with this 5" tall compact Racor filter like I use on the MFG Niagara, but the darn little filter's price is over $74 now (I paid about $45 3 years ago), so I started shopping around for a suitable substitute.

62-025rac02.jpg


Racor products are expensive in general, and this is the popular water separating filter they offer, typically retailing at over $90.

52237F-p.jpg


A little too much for my wallet.

Then I found this Moeller unit. I have other Moeller Marine products, and they are all first class, so I decided to take a chance and order this one at about $55. It filters down to 10 micron, just like the Racor, has a clear bowl like the Racor (well, Racor's is transparent blue), but replacement filters are less than Racor's.

033314-10_07823-72dpi.jpg


The filter came today, and I was surprised at how heavy it is. The filter head is a composit plastic (never rust), and the filter cartridge is solid and appears to be coated inside to prevent rust. Some of the cheap $25 spin on filters tend to rust becasue they are bare metal inside. Brass threads for the filter screw on, and the clear site bowl is heavy plastic with a big O ring seal. The drain is also substantial and takes a hose on the drain valve to make draining water easier. It also came with 3/8" npt plugs and hose barbs for 5/16 fuel line. It can also be plumbed with in and out on opposite sides, or in and out on the same side.

It also takes the "universal" spin on filter in a pinch, so you won't be stuck if it cloggs up looking for a proprietary replacement filter.

So if your looking for a water separating filter with a clear water collection bowl and drain, and the economy is shrinking your boating budget, this might be the ticket.
 

seven up

Petty Officer 1st Class
Joined
Jun 4, 2006
Messages
275
Re: Water separating filters

Great research and idea. I like the EZ-Drain on the bottom of the filter. Sometimes I question the quality of what is going into the fuel tank.

Enjoy
 

Mark42

Fleet Admiral
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Oct 8, 2003
Messages
9,334
Re: Water separating filters

Great research and idea. I like the EZ-Drain on the bottom of the filter. Sometimes I question the quality of what is going into the fuel tank.

Enjoy


Thanks for your comments. One thing I did forget to mention is that all filters with a plastic bowl on the bottom can only be used with outboard motors. If you have an I/O, there is an identical model with a metal bowl. You can't see the water, but you can drain a sample and check every now and again.

All in all, its cheap insurance.
 

Mark42

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Oct 8, 2003
Messages
9,334
Re: Water separating filters

Sierra also makes one like the Moeller filter. In fact, they look identical except for the head, and the Sierra comes in 1/4" npt except for the the more expensive stainless head that comes in 3/8". Moeller is 3/8" in composite or stainless. Both are 10 micron filters.

Its good to know that the filter cartridges and sight bowls are interchangeable between the Sierra and Moeller filters. The filter cartridges sell for as little as $16.00 compared to the Racor proprietary filters at $32. Racor does make a filter to fit the Sierra and Moeller units for about $25. The Racor is a 10 micron filter too.

Sierra part numbers:

http://ww2.sierramarine.com/catalog_pdf_8025/8025-70.pdf

Moeller part numbers:

http://bongo4u.com/sites/scepter_marine/files/FuelFilters.pdf

iboats is both a Moeller and Sierra retailer, so if you don't see the part listed in the boat store, call with the part number and they should be able to order it.
 

Bob_VT

Moderator & Unofficial iBoats Historian
Staff member
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May 19, 2001
Messages
26,064
Re: Water separating filters

Mark you know they are only effective if you keep up with them. Just having the filter is the start but ignoring it for extended periods of time would make it's installation moot.
 

Tail_Gunner

Admiral
Joined
Jan 13, 2006
Messages
6,237
Re: Water separating filters

Are you carbed or efi, i would think that would make a diff. Since you have a new tank there is very little chance of sediment being scavenged. A carbed motor would not need a water seperator would it.

Up here in portland they have used alcohol in gas for so long there has been very little problems with sediment both in the customers tank and the disturbors tank's. Id bet a low particulate filter would be the best route...and low cost filter replacement.
 

Mark42

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Oct 8, 2003
Messages
9,334
Re: Water separating filters

.... A carbed motor would not need a water seperator would it.....
.


The problem is not so much the carb, but a two cycle motor runs on very little oil in the fuel for lubrication. Water in the fuel creates steam during combustion, and the steam washes the oil off the cylinder wall really good. Without an oil ring like 4 cycle motors have, the cylinder is running dry. The result is a badly scored cylinder and rings.
 

Tail_Gunner

Admiral
Joined
Jan 13, 2006
Messages
6,237
Re: Water separating filters

opps...:redface: two cycle huh...You one half to burn a hell of a lot of water in one short time period to affect things...But if you did a controlled burn say a cup or two in 10 mins youd have a very clean motor..:p

I still believe it gets down to particulates...Where's WaterInTheFuel when you need him..;) I cant imagine fuel absorbing that much water...err alcohol. But it is conceviable that it could break down the gas oil mix and again thats a lot of water.

How long do you let a tank of gas sit....:confused:
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,074
Re: Water separating filters

I run the spin on universal water seperators in my boats. They cost about $6 ea, and I change them each season an dump them into a clear container to see how much water. There is never more than a few oz., sometimes none.

Whereas I like the idea of seeing the water build up, I dislike paying the cost of the filters, and haven't see enough water to worry about. Just my .02
 

Mark42

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Oct 8, 2003
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9,334
Re: Water separating filters

I was reading a test of various filters and when they filled with water, they passed the water. Every one, including Racor. Just be aware if you do have a water problem, might want to carry extra filters. In a pinch, those $6 filters will fit the Moeller and Sierra filter heads too.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,074
Re: Water separating filters

I do carry a spare filter in the boat. I also jug the gas from a reliable service station. I dump any residual liquid in the 6 gal jugs, in the spring to keep water out. I also pump out the bottom of the main tank in the boat every few years. I pump out the bottom of the oil injection tank every spring, and keep it topped off over the winter.
 
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