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Whether it’s for a runabout, bass boat, or center console fishing boat, Sierra is dedicated to producing the best performing, most reliable filters in the world.

Air Filters

Today’s high tech engines require precise amounts of fuel, oil and air to operate at peak performance. Older carbureted engines did not use air filters because the environment they ran in was considered “clean” enough that none were required. However today’s fuel injected and computer controlled engines monitor every aspect of engine operation. That “clean” air is no longer clean enough.

Air filters have become more prevalent on today’s outboard engines, and Sierra offers OEM quality replacement filters that meet or exceed the OEM for those needs. Sierra outboard and diesel air filters are designed and tested for the marine environment, and just like everything we do, they are backed by the best warranty in the marine business. Sierra’s Limited Lifetime Warranty!


Fuel Filters

Sierra is the industry leader in 10-micron technology. Sierra filters not only protect your engine, they are over 90% efficient at removing engine damaging 10-micron and larger particles without starving the engine for fuel. Don’t be fooled by other 10-micron imitators that don’t list their efficiency. Sierra filters are independently lab tested and approved.

Sierra offers the widest selection of OEM direct replacement fuel filters on the market. Sierra supplies OEM manufacturers with patented fuel filter technology. Sierra offers a full line of cartridge, canister and inline filters to fit just about every engine in the marine market.

If it powers your boat, chances are we have a filter to protect it. Install with confidence and know you are backed by the Sierra Industry Leading Warranty, which pays for parts and labor and incidental damage.


Many of today’s high-tech engines require proper fuel system maintenance to operate efficiently. Sierra is a leader in the marine industry for fuel system parts and filters. Sierra is not only the largest aftermarket supplier of marine parts, but Sierra also supplies to the OEM engine manufacturers. Sierra canister fuel filters are designed to be an exact fit and performance replacement to your current OEM canister filter.

Sierra offers an extensive line of 21-micron filters and is an industry leader in 10-micron filter technology. Sierra canister filters are tested to meet ISO, SAE and JIS standards. Sierra 10-micron filters are over 90% efficient at removing dirt and debris from your fuel system while not starving the engine for fuel.

Don’t be fooled by other 10-micron filters that don’t specify efficiency. Any filter can catch some 10-micron particles, but how many of the engine damaging particles do they let through?  The Sierra 18-7866 fuel filter is manufactured with a patent-pending design and is endorsed for use on Yamaha HPDI engines.

Canister Technology
Sierra canister fuel filters are designed specifically for the marine environment and today’s ethanol blended fuels.

  • SAE, JIS and ISO tested and approved.
  • Replace filters every 50 hours of operation or at a minimum of once per year, preferably at winterization.
  • Epoxy coated steel canister prevents corrosion inside the canister from reaching your fuel system, not a flimsy aluminum canister.
  • Fuel specific media for both gasoline and diesel applications.
  • The latest drainable bowl technology available for inboards and outboards.
  • Pressure and leak tested to ABYC and USCG standards.
  • Fire tested to meet ISO and USCG requirements.
  • Sierra 10-micron filters are independently lab tested.
  • Sierra is a leading supplier of canister filters to the OEM marine market.
  • Sierra offers larger media area than the competition to stop more dirt and debris from entering your engine.
  • All Sierra filters are designed to meet or EXCEED your engine manufacturers’ requirements.

Canister Maintenance

  • Proper fuel filter maintenance is critical to keeping today’s high tech engines running properly, with just a little extra time and minimal expense you can save hundreds or thousands of dollars in costly fuel system repairs.
  • Replace filters every 50 hours of operation or at a minimum of once per year, preferably at winterization.
  • Upgrade your filter if possible. 10-micron filters are available for most engine configurations. Upgrade from a 21-micron to a 10-micron and keep more engine clogging dirt and debris from entering the fuel system. Plus, 10-micron filters are your number one defense against problems caused by ethanol based fuels.
  • Inspect fuel lines and filter head for leaks and damage. If in doubt, replace the part.
  • Always add a light coating of motor oil to the seal of the fuel filter to allow for easy removal.
  • Do not over-tighten filters, and always inspect for leaks after installation.
  • Dispose or your old filter properly. Most service, parts and quick lube facilities will allow you to drop off old filters for proper disposal.


Sierra offers the largest selection of inline and cartridge fuel filters to meet the specific requirements of your engine. Direct replacement OEM filters mean you can install with confidence and know that the Sierra’s industry leading warranty backs each filter.

Sierra filters undergo extensive testing in real world situations and that’s why professional technicians and do-it-yourselfers around the world choose Sierra filters to protect their engine. Sierra inline and cartridge filters are tested and approved for ethanol-based fuels and meet the demands of today’s high tech-high performance engines.

Inline Filter Technology

  • Sonically sealed end caps.
  • OEM matched filter media.
  • Maximum performance with no restrictions.
  • Direct OEM replacements or universal designs available.
  • Approved for use with ethanol-based fuels.

Inline Filter Maintenance
Today’s ethanol blended fuels act to dissolve gum and varnish found in your fuel system. Proper fuel system maintenance is critical to keeping your engine running properly and prevent costly repairs.

  • Inspect filters regularly and replace every 50 hours of operation or at a minimum of at least once per year, preferably when you winterize.
  • Check for fuel leaks and deteriorated fuel lines. If fuel lines are stiff, replace them. Ethanol based fuels will cause the fuel lines to deteriorate from the inside and will also make older fuel lines stiff and brittle.
  • Many smaller engines have no fuel filters on the system. Sierra offers easy to install universal inline filters that will fit just about any fuel line on the market and give you an easy visual inspection method for your fuel system.
  • When in doubt, leave it to a professional. If unsure or unaware of how to replace your filters, let your local Sierra marine professional do the job for you.


Don’t have a water separating fuel filter? Well, Sierra offers the largest selection of fuel filter kits to meet the needs of most boaters. 10-micron ethanol approved fuel kits to keep today’s high tech engines running strong.

Stainless steel filter heads for salt and brackish water conditions. Aqua-Vu above deck drainable bowl kits make inspection and draining of water easy and convenient. Metal drainable bowls offer the same water draining abilities as their clear bowl counterparts, but are fire tested and designed specifically for installation below deck.

Sierra canister kits come complete with brass plugs to allow easy flow-thru or one-sided in/out installation. Bonus filter kits give you an extra spare filter for piece of mind and security. All Sierra filters and brackets are designed to meet or exceed OEM specifications and in many cases Sierra is the OEM supplier to boat and engine builders worldwide.

Filter Kit Technology

  • 10-micron filter kits are designed to flow over 90 gallons per hour to prevent fuel starvation to the engine.
  • 10-micron fuel kits trap over 90% of 10-micron or larger particles from the fuel system, helping to prevent costly engine damage.
  • Filter kits are complete with mounting brackets of either aluminum (freshwater) or stainless steel (salt & brackish water), and the necessary brass pipe plugs to complete the installation.
  • Multiple inlet and outlet ports allow for either flow-thru or single side fuel flow. Allowing for mounting in most engine configurations.
  • Bonus kits are conveniently packaged with spare filter.
  • Kits are manufactured in ISO certified facility.

Filter Kit Maintenance
Inspect filters for leaks and damages each time engine is put into service.

  • Replace filters every 50 hours of operations or at a minimum of once per year. Ethanol blended fuels will cause debris and varnish to dissolve from fuel tanks and fuel lines which may require more frequent replacement of filters.
  • Inspect mounting bracket for fuel filter to be sure bracket is securely mounted to bulkhead.
  • Never use PTF tape when installing threaded fuel lines or pipe plugs. Use PTF paste. Threads from the tape tend to enter and block passages in the fuel system.
  • Use the right size filter for job. Read engine horsepower recommendations and restrictions prior to installing fuel filter kit.


Oil Filters

Since 1966 Sierra has been a pioneer in the field of oil filtration. We are committed to providing your boat with the very best in engine protection with premium, application-specific oil filters. Our dedication is backed by substantial, ongoing research in filtration media, filter design and manufacturing processes.

As a result, Sierra oil filter designs represent the very best of what we have learned after decades of research and development. No matter what type of boat you drive Sierra has you covered.


  • Specifically designed to match the OEM filter.
  • Anti-drain back valves help prevent dry-starts.
  • Epoxy coated steel canister prevents corrosion and allows for easy installation and removal.
  • Designed for the marine environment.
  • Meets or exceeds OEM filtration requirements.
  • Backed by Sierra Limited Lifetime Warranty.
  • We pay parts, labor and incidentals (see warranty)
  • Wide selection of filters for inboards, diesel and outboard engines.
Diesel Inboard Technology

  • Steel outer case for maximum strength. Won’t crush like aluminum.
  • High efficiency filtration media.
  • Anti-drain back technology (where applicable) helps keep oil in the system and limits wear and tear on engine start up.
  • Epoxy coated canister prevents corrosion. Specifically designed to meet the high flow needs of today’s marine engine.
  • Large capacity / high volume diesel specific filters.

Gasoline Inboard Technology

  • Steel outer case for maximum strength. Won’t crush like aluminum.
  • High efficiency filtration media.
  • Anti-drain back technology (where applicable) helps keep oil in the system and limits wear and tear on engine start up.
  • Epoxy coated canister prevents corrosion.
  • Specifically designed to meet the high flow needs of today’s marine engine.

Outboard Technology

  • Canister filters made from epoxy coated steel for added strength.
  • Cartridge filters designed to OEM specifications.
  • High flow filter media designed for the demands of the marine environment.
  • Anti-drain back technology (where applicable) to help keep lubrication from draining back into the crankcase, providing extra protection on start-up.

Oil Filter Maintenance

  • Replace filter after first 20 hours of engine operation.
  • After first 20 hours filters are to be replaced every 50 hours of operation or at a minimum of once yearly.
  • Add a coating of engine oil to sealing gasket prior to installation to prevent filter from “freezing” in place and allow for easy removal.
  • Use marine rated oil filters and not automotive filters. Marine filters generally filter at a higher micron level and also allow for more oil flow at higher rpm’s than automotive filters.
  • Use the correct grade and weight of marine rated oil to protect your engine. Follow engine manufactures recommended procedures on oil and filter changes. In general, be sure to run engine to operating temperature to aid in removing all oil from crankcase and keep debris suspended in oil for removal.
  • Never run engine out of the water without a properly installed flushing device in place.
  • Do not over-tighten filter.
  • Be sure and run engine and check for leaks after any oil service.