Your Price: $1.89
Save: $0.79
(29% Off $2.68)
Part # 18-4256 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Your Price: $27.69
Save: $20.84
(42% Off $48.53)
Part # 18-7775 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Hurry! Only 1 left in stock
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Bracket Type:
  • 3/8" Aluminum
Replaces OEM part #
  • MERCURY MARINE 89876-A3
Your Price: $32.15
Save: $15.60
(32% Off $47.75)
Part # 18-7775-1 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Kit type:
  • 3/8" aluminum
Contains:
  • (1) 18-7845 or 6031 Filter
  • (1) 18-7775 Bracket
  • (2) Brass Pipe Plugs
Replaces OEM part #
  • MERCURY MARINE 35-805269A4
  • MERCURY MARINE 35-60494A4
  • MERCURY MARINE 32-802893Q4
Your Price: $61.82
Save: $15.35
(19% Off $77.17)
Part # 18-7776 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Bracket Type:
  • 3/8" Stainless
Replaces OEM part #
  • MERCURY MARINE 89876-A3
Your Price: $56.90
Save: $38.76
(40% Off $95.66)
Part # 18-7776-1 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Kit type:
  • 3/8" Stainless
Contains:
  • (1) 18-7845 or 6031 Filter
  • (1) 18-7776 Bracket
  • (2) Brass Pipe Plug

Replaces OEM part #
  • MERCURY MARINE 35-805269A4
  • MERCURY MARINE 35-60494A4
  • MERCURY MARINE 32-802893Q4
Your Price: $73.30
Save: $35.32
(32% Off $108.62)
Part # 18-7777 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Bracket Type:
  • 1/4" Stainless
Replaces OEM part #
  • MERCURY MARINE 89876-A3
Your Price: $56.30
Save: $38.35
(40% Off $94.65)
Part # 18-7777-1 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Kit Type:
  • 1/4" Stainless
Contains:
  • (1) 18-7845 or 6031 Filter
  • (1) 18-7777 Bracket
  • (2) Brass Pipe Plugs
Replaces OEM part #
  • MERCURY MARINE 32-802893Q4
  • MERCURY MARINE 35-60494A4
  • MERCURY MARINE 35-805269A4
Your Price: $5.85
Save: $3.13
(34% Off $8.98)
Part # 18-7844 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.

21 Micron Fuel Filter

Features:

  • Protects the motor against ethanol. The ethanol in fuel absorbs more water and will loosen more particulants than regular fuels.
  • Provides proper filtration, as is required for any size of engine
  • Flows at 90 GPH to be compatible most engines

Specifications:

  • Rating: 21 Micron
  • Filter Size: 3.875" (Short)


Replaces OEM part #

  • MERCURY MARINE 35-807172
  • MERCURY MARINE 35-802893Q
  • MERCURY MARINE 35-802893Q01
  • MERCURY MARINE 35-806771
  • MERCURY MARINE 35-8052691
  • MERCURY MARINE 35-604941
  • MERCURY MARINE 35-60494A5
  • MERCURY MARINE 35-57250
  • MERCURY MARINE 35-55501
  • MERCURY MARINE 35-52456
  • MERCURY MARINE 35-60494
  • MERCURY MARINE 35-805269

Not to be used on 1992 GenII 4.3L and 4.3LX engines using in-line fuel filter OE#35-80531T.

Your Price: $5.93
Save: $3.14
(34% Off $9.07)
Part # 18-7845 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
1/4" Aluminum Tall Filter(4.35"), extra capacity, 21 Micron Rating
Replaces OEM part #
  • MERCURY MARINE 35-807172
  • MERCURY MARINE 35-802893Q
  • MERCURY MARINE 35-60494-1
  • YAMAHA ABA-FUELF-IL-TR
  • CRUSADER 22687
  • VOLVO 855686-2
Your Price: $30.76
Save: $10.52
(25% Off $41.28)
Part # 18-7848-1 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
No Reviews  |  Write Review  |  Ask Question
Kit Type:
  • 1/4" Aluminum (short filter)
Contains:
  • (1) 18-7844 or 6041 Filter
  • (1)18-7853-1 Bracket
  • (2) 18-4256 Brass Plugs
  • For Johnson/Evinrude engines
  • For Mercury/Mariner engines
  • For Mercruiser engines

Replaces OEM part #
  • MERCURY MARINE 35-805269A4
  • MERCURY MARINE 35-60494A4
  • MERCURY MARINE 32-802893Q4
  • SUZUKI 99105-20001
  • YAMAHA ABA-SEPAR-AT-OR
Fuel Water Separator Bonus Kit - Sierra
Your Price: $37.18
Save: $13.12
(26% Off $50.30)
Part # 18-7848-2 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Hurry! Only 1 left in stock
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Kit Type:
  • 1/4" Aluminum (short filter)
Contains:
  • (2) 18-7844 Filters
  • (1) 18-7853-1 Bracket
  • (2) 18-4256 Brass Pipe Plugs
Replaces OEM part #
  • MERCURY MARINE 35-805269A4
  • MERCURY MARINE 35-60494A4
  • MERCURY MARINE 32-802893Q4
Your Price: $34.00
Save: $7.55
(18% Off $41.55)
Part # 18-7852-1 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
18-9004 Pipe Sealant with Teflon is recommended for use on filter bracket fitting threads

Kit Type:
  • 1/4" Aluminum (tall filter)
Contains:
  • (1) 18-7845 or 6031 Filter
  • (1) 18-7853-1 Bracket
  • (2) 18-4256 Brass Pipe Plugs

Details:

  • Sierra fuel water separators remove over 99.8% of emulsified water from your gasoline
  • Able to supply even the biggest engine with a 90 GPH flow.
  • Prevent damage to sensitive inboard, sterndrive and outboard fuel injection systems
  • Material: Aluminum (Tall Filter)
  • Rating: 21 Micron
  • Size: 1/4" or 6.4mm

    Replaces OEM part #
  • MERCURY MARINER 35-60494 A4
  • MERCURY MARINER 32-802893Q4
  • MERCURY MARINER 35-805269 A4
  • SUZUKI 99105-20005
  • YAMAHA MAR-SEPAR-AT-OR
  • CRUSADER 22687
Your Price: $32.92
Save: $11.79
(26% Off $44.71)
Part # 18-7852-2 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Kit Type
  • 1/4" Aluminum (tall filter)
Contains:
  • (2) 18-7845 Filter
  • (1) 18-7853-1 Bracket
  • (2) 18-4256 Brass Pipe Plugs
Replaces OEM part #
  • MERCURY MARINE 35-805269A4
  • MERCURY MARINE 32-802893Q4
  • MERCURY MARINE 35-805269A4
Your Price: $26.99
Save: $5.85
(17% Off $32.84)
Part # 18-7853-1 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Hurry! Only 1 left in stock
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Bracket Type:
  • 1/4" Aluminum
Replaces OEM part #
  • MERCURY MARINE 89876A3
Your Price: $17.11
Save: $9.14
(34% Off $26.25)
Part # 18-7967 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Replaces OEM part #
  • MERCURY MARINE 35-18458Q3 (V6 EFI, 1995 and earlier)
  • Late model Fuel Water Separator with Sensor
Your Price: $13.74
Save: $7.45
(35% Off $21.19)
Part # 18-7968 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Replaces OEM part #
  • MERCURY 35-18458Q4 (V6 EFI, 1996 - current)
  • Late model Fuel Water Separator with Sensor
Your Price: $74.99 Discontinued
Save: $19.67
(20% Off $94.66)
Part # 9-37855 2nd Day Air for $2 More Eligible
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Replaces Original Equipment Manufacturer(OEM):Universal
Replaces Original Equipment Manufacturer # (OEM #):N/A
Fits Application:Universal
(Discontinued)
Low Price Guarantee
Your Price: $29.98
Save: $16.40
(35% Off $46.38)
Part # 9-37852 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
No Reviews  |  Write Review  |  Ask Question
Replaces Original Equipment Manufacturer(OEM):Universal
Replaces Original Equipment Manufacturer # (OEM #):N/A
Fits Application:Universal
Mallory Filter, Fuel Water Seperator Kit 9-37851
Your Price: $25.98
Save: $13.18
(33% Off $39.16)
Part # 9-37851 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Replaces Original Equipment Manufacturer(OEM):Mercury / Volvo / Yamaha / Suzuki
Replaces Original Equipment Manufacturer # (OEM #):35-802893Q4 / 35-805269A4
Your Price: $29.99
Save: $9.02
(23% Off $39.01)
Part # 9-37850 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Replaces Original Equipment Manufacturer(OEM):Mercruiser
Replaces Original Equipment Manufacturer # (OEM #):35-802893Q4
Your Price: $12.01
Save: $8.83
(42% Off $20.84)
Part # 9-37806 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):35-18458Q4
Fits Application:V-6 EFI/DFI outboards 1996-newer
Your Price: $16.99
Save: $6.91
(28% Off $23.90)
Part # 9-37805 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
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Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):35-18458Q3
Fits Application:V-6 EFI outboards 1995-earlier
Your Price: $6.99
Save: $1.62
(18% Off $8.61)
Part # 9-37801 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Replaces GLM #:24940
Replaces Original Equipment Manufacturer(OEM):Mercury / Volvo / Yamaha / Crusader
Replaces Original Equipment Manufacturer # (OEM #):35-807172
Fits Application:All Mercury Outboards & Mercruisers except 4.3L w/electric fuel pumps
Your Price: $18.99
Save: $7.35
(27% Off $26.34)
Part # 18-9884 2nd Day Air for $2 More Eligible
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Hurry! Only 1 left in stock
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Replaces OEM part #
  • RACOR RK22628
For:
  • Sierra, Racor and other aftermarket filter bowls
 
Your Price: $21.27
Save: $25.97
(54% Off $47.24)
Part # 9-37854
SHIPS TODAY!* if ordered in 5 hrs 1 min.
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
 
Your Price: $27.99
Save: $8.60
(23% Off $36.59)
Part # 9-37857
SHIPS TODAY!* if ordered in 5 hrs 1 min.
No Reviews  |  Write Review  |  Ask Question
 
Your Price: $24.99
Save: $4.99
(16% Off $29.98)
Part # 9-37864
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Sierra
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Based On 6 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Star
Always good
by Dave from London, Ontario on July 18, 2016
Have been using Sierra filters for years. Great product at a reasonable price
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Full StarFull StarFull StarFull StarFull Star
Fuel water separator
by Paul from Carmichael, California on May 09, 2016
This was the right fit it worked perfect the price was great .
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Full StarFull StarFull StarFull StarFull Star
LOOKS GOOD
by JOE from Ludington, Michigan on February 18, 2015
GOOD
(0 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
good
by Daniel from Central Square, New York on September 29, 2014
good
(0 of 1 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Sierra Fuel/Water Separator
by Andrew from Rogers, Ohio on May 01, 2012
With gasoline now contaning 10% ethanol, removing water from the fuel is important. Ethanol attracts moisture from the air, and moisture in the engine is bad news. I've used Sierra fuel/water separators for years, and never had any such related problems with water. They should be changed yearly, more frequently if you run more than the average.
(14 of 15 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Review for Sierra 18-7844 Fuel Water Separator Filter
by a Customer on March 20, 2009
(5 of 18 people found this review helpful)
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Full StarFull StarFull StarFull StarHalf Star
Based On 9 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Star
Absolute must for all marine engines
by Rene from Wilsonville, Oregon on August 08, 2016
Works great, no fuel issues since I began using these.
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Full StarFull StarFull StarFull StarFull Star
Fuel Water Seperator
by James from Chesapeake, Virginia on July 25, 2016
Very pleased. Fast shipping.
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Full StarFull StarFull StarFull StarFull Star
Sierra 18-7845 filter
by Thomas from Bemidji, Minnesota on June 18, 2016
Iboats had the best online price for this filter. They also have shipping rates that are lower than most other online retailers of boating accessories. Great company to deal with.
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Full StarFull StarFull StarFull StarFull Star
A+
by Gene from Trempealeau, Wisconsin on July 15, 2015
Fits and works great
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Full StarFull StarFull StarFull StarFull Star
Fits my factory Mercruiser fuel filter header
by Jim from Tolono, Illinois on September 15, 2013
Nothing else to say. Fits. Seems to work. Cheap.
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Full StarFull StarFull StarFull StarFull Star
good product
by Peter from Flushing, New York on June 15, 2013
satisfied
(0 of 1 people found this review helpful)
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Full StarEmpty StarEmpty StarEmpty StarEmpty Star
21 Micron filter
by Emmett from Pearland, Texas on April 26, 2013
This is labeled as a replacement for the Mercury 35-802893Q, but when received the specs reflect it is a 21 Micron filter! NOT the 10 Micron filer I need. I had looked for the specs on-line before ordering and they were not listed. The 10 Micron P/N is 18-7945 according to the West Marine website.
(1 of 3 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
water filter
by James from Texas City, Texas on April 16, 2012
i have always had a great experience dealing with i-boats and have always gotten quality products for a low price and these water filters for my boat are no exception. great filter for a great price !!!!
(2 of 7 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Filters
by Giuseppe from Hillsborough, New Jersey on August 15, 2011
Great service
(1 of 6 people found this review helpful)
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Average Customer Review for Sierra 18-7852-1 Fuel Water Separator Kit
Full StarFull StarFull StarFull StarFull Star
Based On 3 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Star
Perfect for 98 Mercruiser 3.0
by James from Haverhill, Massachusetts on August 17, 2012
Performs as advertised, same form, fit, function as higher priced OEM offering.
(4 of 4 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
As described
by Brian from Export, Pennsylvania on May 12, 2012
Easy to mount and set up. multiple mounting options makes it easy to find a good spot for any set up.
(4 of 4 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Review for Sierra 18-7852-1 Fuel Water Separator Kit
by a Customer on June 23, 2009
Nice kit easy to install and has several choices on how to run your fuel lines....
(30 of 33 people found this review helpful)
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Average Customer Review for Sierra 18-7967 Fuel Filter
Full StarFull StarFull StarFull StarFull Star
Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull Star
quick great service good product
by Daniel from Holdenville, Oklahoma on April 07, 2014
Unfortunately i ordered the wrong product and their customer service was helpful with returns.
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Average Customer Review for Sierra 18-7968 Fuel Filter
Full StarFull StarFull StarFull StarFull Star
Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull Star
Fuel Filter.
by Dirk from Cinnaminson, New Jersey on May 09, 2016
Quality as good as OEM.
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Full StarFull StarFull StarFull StarFull Star
Based On 2 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Star
Great product!
by Michael from Noblesville, Indiana on October 07, 2013
I like the fact that the hose barbs came with the kit and that the filter was shrink wrapped to protect it. Installation was a breeze. One note for other installers: pre-fill the filter with gas before you screw it onto the housing it will make start up much easier.
(6 of 6 people found this review helpful)
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Full StarFull StarFull StarFull StarFull Star
Great Product
by Stephen from Hubert, North Carolina on July 04, 2013
If you do not already have one of these installed on your boat, you should waste no time getting one soon! The one I received did not have the two plugs for the unused ports. Luckily I already had some so installing it wasn't a problem.
(5 of 5 people found this review helpful)
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Average Customer Review for Mallory 9-37806 Fuel Filter
Full StarFull StarFull StarFull StarFull Star
Based On 2 Reviews | Write Review
Full StarFull StarFull StarFull StarFull Star
Good buy
by Allen from Gig Harbor, Washington on March 01, 2015
Looked for a new replacement filter for my Merc, and found this one. Exact fit, and so far works great. Will be buying this one each year.
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Full StarFull StarFull StarFull StarFull Star
great
by a Customer from Biloxi, Mississippi on February 25, 2013
worked great and got it right on time
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Full StarFull StarFull StarFull StarFull Star
Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull Star
Good Price
by Raymond from Belvidere, New Jersey on May 27, 2011
it is what I odered but have not used it yet
(1 of 6 people found this review helpful)
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Q:
Is this the same as mercury part 35-18458t4?
A:
Yes that cross references with that OEM number.


Q:
Is there a mounting bracket for this filter?
A:
There is a bracket with this filter.


Q:
Will this fit a 1998 mercury 135 hp xl?
A:
Yes this will fit your motor as long as you have the fuel-water separator set up.


Q:
How can I determine if I need to replace my fuel/water separating filter for a 4.2L 1989 MerCruiser with 1/4" outlet?
A:
It needs to be changed every 50 hours or once a year.


Q:
My fule lines are 3/8 id, will this filter work for me ?
A:
Sierra cannot match it up by measurements. They can only match it up by engine application. Contact us at the number at the top of the page for more assistance.


Q:
I have an older boat, it has a water fuel separator filter (probably original). On the front of the filter, clearly states Sierra 18-7848, on the back, states "replaces OMC (174144). Is this the right filter? On the front, there is only 18-7848, there is no -1 at the end. Thanks?
A:
The "-1" indicates packaging only. It is the same part.


Q:
Can youbuy just the filter or does it only come in a kit?
A:
Filter is 18-7844.


Q:
Does this fit on a GM 302 Inboard engine. 2001 Glastron Volvo Penta ???
A:
Please call or chat in with engine info to confirm, we need manufacturer name, horse power, model/serial number.


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