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Mercruiser water separating gas filter cut open #5131928
06/12/19 01:32 AM
06/12/19 01:32 AM
Joined: Jul 2008
Posts: 1,029
Maryland USA
rubberchicken Offline OP
rubberchicken  Offline OP

Joined: Jul 2008
Posts: 1,029
Maryland USA
Comparison between a virgin Quicksilver water separating gas filter , and a used Sierra equivalent, in service for 2 years. The Mercruiser / Quicksilver is part 35-866340K01 and the Sierra is a popular line of marine replacement parts. The Sierra was in service for about 100 hours, or about 1200-1500 gallons of gas.
The reason I post this here is because they are almost identical to oil filters.
Some observations
- Sierra does not seem to have any coating on the inside, while the Merc has a claimed epoxy coating. Very important considering that water builds up in the filter.
- Merc internal coating had air bubbles under the paint, and the end-plate was not coated on the inside. So good idea, poor execution on the internal coating.
- Sierra external coating was not as good as Merc, and had noticeable rust spots.
- Sierra not apparently coated on the inside, but I did not detect any internal rust. There was a tiny bit of water present when I drained the filter into a jar.
- Sierra has more filter area, Merc has more water holding capacity.
- Sierra had an assembly defect- the black nitrile gasket was offset and probably did not seal 100%, which might let dirty fuel bypass the filter.
- Sierra made in Taiwan, Merc in US.
- Merc / QS always on left, Sierra on right if 2 pics are side by side.

Honestly I was disappointed by both of them, but I would give the Merc a 6 out of 10, and the Sierra a 4 out of 10. I might consider a Racor for such an important part.

Last edited by rubberchicken; 06/12/19 01:48 AM.
Re: Mercruiser water separating gas filter cut open [Re: rubberchicken] #5131930
06/12/19 01:37 AM
06/12/19 01:37 AM
Joined: Jul 2008
Posts: 1,029
Maryland USA
rubberchicken Offline OP
rubberchicken  Offline OP

Joined: Jul 2008
Posts: 1,029
Maryland USA
[Linked Image]
[Linked Image]
[Linked Image]

Re: Mercruiser water separating gas filter cut open [Re: rubberchicken] #5131932
06/12/19 01:46 AM
06/12/19 01:46 AM
Joined: Jul 2008
Posts: 1,029
Maryland USA
rubberchicken Offline OP
rubberchicken  Offline OP

Joined: Jul 2008
Posts: 1,029
Maryland USA
[Linked Image]
[Linked Image]
[Linked Image]

The brown smudge is sealer from the filter smeared around. The paint bubbles, which were all on the bottom, numerous and massive- the size of a US 5 cent piece , do not show up well.

Last edited by rubberchicken; 06/12/19 01:55 AM.
Re: Mercruiser water separating gas filter cut open [Re: rubberchicken] #5131933
06/12/19 01:47 AM
06/12/19 01:47 AM
Joined: Jul 2008
Posts: 1,029
Maryland USA
rubberchicken Offline OP
rubberchicken  Offline OP

Joined: Jul 2008
Posts: 1,029
Maryland USA
[Linked Image]
[Linked Image]
[Linked Image]

Merc / QS on left, Sierra on right

Re: Mercruiser water separating gas filter cut open [Re: rubberchicken] #5131976
06/12/19 04:26 AM
06/12/19 04:26 AM
Joined: May 2012
Posts: 6,610
Fort Lauderdale, FL
DoubleWasp Online content
DoubleWasp  Online Content

Joined: May 2012
Posts: 6,610
Fort Lauderdale, FL
Once you go Racor, you don't go back.

The spin on cans are adequate for a gasoline fuel engine, but if you want industrial level filtering and separation, you can't beat a Racor or equivalent.

If you get one with a solid metal bowl for USCG compliance, get the water-in-fuel sensor. If you decide to do a low-micron element (2-micron) get a vacuum gauge for the exit port. Both are cheap and easy to set up. You can change your filter and drain water by performance rather than blind assumption.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Mercruiser water separating gas filter cut open [Re: rubberchicken] #5132208
06/12/19 10:37 AM
06/12/19 10:37 AM
Joined: Mar 2004
Posts: 22,342
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 22,342
Upstate NY
Most people change them once a year regardless. Both should do the job. Many Mercruiser carb engines have an additional filter at the carb.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Mercruiser water separating gas filter cut open [Re: DoubleWasp] #5132601
06/12/19 07:43 PM
06/12/19 07:43 PM
Joined: Jul 2008
Posts: 1,029
Maryland USA
rubberchicken Offline OP
rubberchicken  Offline OP

Joined: Jul 2008
Posts: 1,029
Maryland USA
Originally Posted by DoubleWasp
Once you go Racor, you don't go back.

The spin on cans are adequate for a gasoline fuel engine, but if you want industrial level filtering and separation, you can't beat a Racor or equivalent.

If you get one with a solid metal bowl for USCG compliance, get the water-in-fuel sensor. If you decide to do a low-micron element (2-micron) get a vacuum gauge for the exit port. Both are cheap and easy to set up. You can change your filter and drain water by performance rather than blind assumption.


Racor makes a direct replacement for this filter, with a metal bowl. I had one on my previous boat and was very happy, so I may look into one for my current boat. Good tip on the sensor- I did not realize they had that option.

Re: Mercruiser water separating gas filter cut open [Re: rubberchicken] #5134491
06/14/19 10:22 PM
06/14/19 10:22 PM
Joined: May 2012
Posts: 6,610
Fort Lauderdale, FL
DoubleWasp Online content
DoubleWasp  Online Content

Joined: May 2012
Posts: 6,610
Fort Lauderdale, FL
It's a good way to know when to drain. Very good tool to have. Like most WIF sensors, it's just two contacts that bridge when immersed in water.

Just hook it to the ground of a light on the dash, and you're good to go.

Honestly, far from a requirement on a small tank that is used frequently enough and kept filled, but it shuts out any pondering of water contamination or when to drain the filter.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
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