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Outboard Motor Parts | OEM & Aftermarket
Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.
Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.
Shop Outboard Parts by Manufacturer
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts 
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts 
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts Find the Correct Outboard Part
Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.
Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.
Use Our OEM Parts Lookup »Shop Outboard Parts by Engine System
Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.
Common Outboard Problems and Where to Start
- Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
- Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
- Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
- Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
- Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
- Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
Why Buy Outboard Parts from Pro Marine USA?
- OEM and aftermarket replacement options for major outboard engine brands.
- Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
- OEM diagram and part-number lookup tools to help identify the correct component before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
- Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
OEM and Aftermarket Outboard Parts
OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.
Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.
Frequently Asked Questions
How do I find the correct parts for my outboard motor?
Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.
Can I search Pro Marine by OEM part number?
Yes. If you already have the OEM part number, enter it into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.
What information should I have before ordering an outboard part?
Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.
What is the difference between OEM and aftermarket outboard parts?
OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.
Are aftermarket outboard motor parts reliable?
Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.
Do you carry parts for older outboard motors?
Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.
What outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.
0769264
769264
18-79905
18-79981
24400
24501
5034995
69J-24501-00-00
69J-24501-10-00
769710
888279
55481
89876
89876A3
9-37855
MAR-FLTHD-10-BK
55481
89876
89876A3
9-37855
9-37862
Sierra Marine Fuel / Water Separator Filter
Sierra 18-7920 Fuel / Water Separator - 10 Micron - 1"-12 Thread
The Sierra 18-7920 Fuel / Water Separator is a 10-micron spin-on replacement filter designed for universal marine fuel filtration applications using a 1"-12 thread.
This filter uses the large center-hole configuration and is designed to help remove water and fine contaminants from the fuel supply before they reach the engine.
Sierra 18-7920 cross references popular Mercury, Johnson / Evinrude, OMC, Racor and Fram fuel / water separator numbers listed below.
Thread: 1"-12
Filtration: 10 Micron
Style: Spin-On Replacement
Application: Universal Marine
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Sierra |
| Sierra Part Number | 18-7920 |
| Filter Type | Fuel / Water Separator |
| Filtration Rating | 10 Micron |
| Thread Pitch | 1"-12 |
| Configuration | Large Center Hole |
| Replacement Style | Spin-On |
| Application | Universal Marine |
OEM & Cross Reference Numbers
| Manufacturer / Brand | Part Number |
|---|---|
| Sierra | 18-7920 |
| Fram | CH33APL |
| Johnson / Evinrude Outboard | 771839 |
| Mercury Marine | 35-809099 |
| OMC Stern Drive | 771839 |
| Racor | B32014 |
| Racor | S3214 |
Universal Marine Application
Sierra 18-7920 is a universal replacement fuel / water separator filter for compatible marine filter heads using a 1"-12 threaded filter.
Because this filter is used across multiple marine engine brands and fuel systems, fitment should be determined by the filter-head thread and the existing filter cross-reference number rather than by engine horsepower alone.
This is the large-hole 1"-12 thread style fuel / water separator.
Compare your existing filter number and filter-head thread before ordering. Marine fuel separator filters may look very similar while using different center-hole sizes or thread pitches.
What a Fuel / Water Separator Does
A marine fuel / water separator helps protect the engine fuel system by removing water and particulate contamination before the fuel reaches the engine.
Water can enter a marine fuel system through condensation, contaminated fuel or moisture in the tank. The separator provides an additional stage of filtration before the engine-mounted fuel filter or fuel injection system.
10-Micron Filtration
The Sierra 18-7920 is rated at 10 microns, allowing it to capture fine fuel contaminants while separating water from the fuel supply.
Maintaining a clean fuel / water separator can help reduce the chance of restricted fuel flow and contamination reaching carburetors, fuel pumps or fuel injection components.
When Should a Fuel / Water Separator Be Replaced?
Replacement intervals vary based on engine use, fuel quality and operating conditions. Fuel / water separator filters should be inspected and replaced as part of regular marine engine maintenance.
Replacement should also be considered whenever contaminated fuel or water in the fuel system is suspected.
Common Reasons for Replacement
- Routine annual or seasonal maintenance
- Water found in the fuel system
- Contaminated or stale fuel
- Restricted fuel flow
- Engine fuel starvation symptoms
- Unknown age of the existing fuel separator
- Replacing Fram CH33APL
- Replacing Johnson / Evinrude or OMC 771839
- Replacing Mercury 35-809099
- Replacing Racor B32014 or S3214
Installation Notes
Confirm that the filter head uses the correct 1"-12 thread before installation.
Follow the engine or filter-head manufacturer's installation procedure. Inspect the filter-head sealing surface and make sure the old filter gasket has been completely removed before installing the replacement.
Key Features and Benefits
- Sierra marine replacement fuel / water separator
- Sierra part number 18-7920
- 10-micron filtration rating
- 1"-12 thread pitch
- Large center-hole configuration
- Spin-on replacement design
- Universal marine application
- Replaces Fram CH33APL
- Replaces Johnson / Evinrude 771839
- Replaces OMC 771839
- Replaces Mercury 35-809099
- Replaces Racor B32014
- Replaces Racor S3214
- Helps remove water and contaminants from marine fuel
FAQ
What is the micron rating of Sierra 18-7920?
The Sierra 18-7920 is a 10-micron fuel / water separator.
What thread does Sierra 18-7920 use?
It uses a 1"-12 thread.
Is this the large-hole fuel / water separator?
Yes. Sierra 18-7920 is the large center-hole configuration.
Is Sierra 18-7920 a spin-on filter?
Yes. It is a spin-on replacement fuel / water separator.
What Mercury filter does Sierra 18-7920 replace?
It cross references Mercury Marine 35-809099.
What Johnson / Evinrude or OMC number does it replace?
It replaces 771839.
What Racor filters does it replace?
It cross references Racor B32014 and S3214.
What Fram filter does it replace?
It cross references Fram CH33APL.
Is this filter engine-specific?
No. It has a universal marine application for compatible
filter heads using the correct 1"-12 thread.
How do I know if this filter fits my boat?
Compare the existing filter part number and verify that your filter head
uses a 1"-12 thread. Cross-reference numbers are listed above.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help verifying the correct fuel separator?
Contact Pro Marine
Phone: 941-721-3000
Searchable Terms
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0002507
0771839
18-7920
MAR-FLTHD-10-BK
9-37862
0360941
0398319
0435918
0765595
0777715
18-7831
18-7831
311679
360941
398319
40165
765595
777715
802128A1
