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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

 

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.

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Yamaha F6-9.9HP 1985 & UP
Yamaha
F6 2001-2004
F8 2001-2024 
T8 2001-2004
F9.9 1985-2024
T9.9 1985-2024
Item#:
1421
Cross Reference#:
18-99120
6G8-12414-A0-00
6G8-12414-00-00
60R-E2414-A0-00
Manufacturer Item:
6G8-12414-A0-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
2.32
Each
Yamaha F15-F20HP 4-Stroke 2006-2024
Item#:
1423
Cross Reference#:
6AH-12414-00-00
Manufacturer Item:
6AH-12414-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
2.58
Each
Yamaha F150 2005-2024 4 Stroke
Item#:
1422
Cross Reference#:
18-99127
63P-12414-00-00
Manufacturer Item:
63P-12414-00-00
Manufacturer:
Pro Marine
Available:
Out of Stock
ETA:
11/10/2026
Your Price:
7.73
Each
Yamaha 20-25HP 4-Stroke 2017-2024
Item#:
1424
Cross Reference#:
6FM-12414-00-00
Manufacturer Item:
6FM-12414-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
1.65
Each
Yamaha F2.5(2003-Later) F4(2002-Later) F8(2006-Later)
Item#:
18-0754
Cross Reference#:
67D-12414-A0-00
68D-E1241-4A-00
68D-E2414-A0-00
Manufacturer Item:
68D-E2414-A0-00
Manufacturer:
Sierra
Available:
Out of Stock
Your Price:
1.61
Each
This item is discontinued
Item#:
3372M
Cross Reference#:
8M0185144
818864
818864T
846070
94318
96158
96158B
96158T
Manufacturer Item:
818864T
Manufacturer:
MES Marine
Available:
In Stock
Your Price:
22.69
Each
Mercury Verado Fits 3213PS Piston Kit
Item#:
8200XX
Cross Reference#:
881180A01
881180A02
881180A03
Manufacturer Item:
881180A02
Manufacturer:
Wiseco
Available:
In Stock
Your Price:
49.88
Each
OEM Sensor for L6 Verado, 350-425HP V10, 450R-500R V8 & 500-600HP V12

OEM Mercury Water-In-Fuel Sensor

Mercury Water-In-Fuel Sensor 8M0157779 For Verado, 450R, 500R, V10 & V12

The Mercury 8M0157779 water-in-fuel sensor is an OEM Mercury fuel system sensor used with compatible Mercury water-separating fuel filter assemblies.

This sensor fits select L6 Verado applications, Mercury Racing 450R and 500R V8 outboards, Mercury 350HP-425HP V10 outboards, and Mercury 500HP-600HP V12 outboards.

Compatible Applications

Engine Family Horsepower / Model Engine Platform Application
Mercury Verado L6 Verado Models Inline 6-Cylinder Verado Water-in-fuel sensor
Mercury Racing 450R, 500R V8 FourStroke Water-in-fuel sensor
Mercury Verado / FourStroke 350HP-425HP V10 FourStroke Water-in-fuel sensor
Mercury Verado / SeaPro 500HP-600HP V12 FourStroke Water-in-fuel sensor
Important Fitment Note:

This Mercury 8M0157779 water-in-fuel sensor is used on select L6 Verado, 450R-500R V8 Racing, 350HP-425HP V10, and 500HP-600HP V12 outboard fuel filter applications.

Always verify your engine model, fuel filter assembly, and current sensor number before ordering.

Part Numbers & Cross References

Brand / Source Part Number
Mercury Marine 8M0157779
Related Fuel Filter 8M0166596

Related Fuel Filter

What This Water-In-Fuel Sensor is Used For

The Mercury 8M0157779 water-in-fuel sensor monitors the fuel filter assembly for water accumulation and helps alert the operator when water is detected in the fuel system.

Water contamination can cause poor performance, corrosion, injector problems, and fuel system damage. Replacing a damaged or faulty water-in-fuel sensor helps maintain proper warning system function.

Key Features and Benefits

  • OEM Mercury water-in-fuel sensor
  • Fits select L6 Verado applications
  • Fits Mercury Racing 450R and 500R V8 outboards
  • Fits Mercury 350HP-425HP V10 outboards
  • Fits Mercury 500HP-600HP V12 outboards
  • Used with compatible Mercury water-separating fuel filter assemblies
  • Helps detect water accumulation in the fuel system
  • Pairs with Mercury fuel filter 8M0166596 on compatible applications

Part Details

  • Part Number: 8M0157779
  • Product Type: Water-In-Fuel Sensor
  • Brand: Mercury Marine
  • Application: Mercury Verado, Racing V8, V10, and V12 fuel systems
  • Common Fitment: L6 Verado, 450R, 500R, 350-425HP V10, 500-600HP V12
  • Related Fuel Filter: 8M0166596
  • OEM Mercury Part: Yes

FAQ

What engines does Mercury 8M0157779 fit?
This sensor fits select L6 Verado applications, Mercury Racing 450R and 500R V8 outboards, Mercury 350HP-425HP V10 outboards, and Mercury 500HP-600HP V12 outboards.

Does this fit the Mercury 500R?
Yes. Mercury 8M0157779 is used on compatible Mercury Racing 500R V8 fuel filter applications.

Does this fit Mercury V10 outboards?
Yes. This sensor fits compatible Mercury 350HP-425HP V10 outboards.

What fuel filter goes with this sensor?
The related Mercury water-separating fuel filter is part number 8M0166596, linked above.

What does a water-in-fuel sensor do?
It detects water accumulation in the fuel filter assembly so the engine warning system can alert the operator to fuel contamination.

Is this a genuine Mercury part?
Yes. This is an OEM Mercury Marine water-in-fuel sensor.

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.

Apply for a Dealer Account

Shipping Policy

  • Free shipping on orders over $100 continental U.S.
  • Orders ship via UPS, USPS, and FedEx.
  • 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.
  • Electrical sensors must be new, unused, and uninstalled.
  • Installed or fuel-contaminated sensors are not returnable.
  • Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000


Searchable Terms

8M0157779, Mercury 8M0157779, Mercury water in fuel sensor, Mercury water-in-fuel sensor, Mercury fuel filter sensor, Mercury Verado fuel sensor, L6 Verado water in fuel sensor, Mercury 450R water in fuel sensor, Mercury 500R water in fuel sensor, Mercury Racing fuel sensor, Mercury V8 water in fuel sensor, Mercury V10 water in fuel sensor, Mercury V12 water in fuel sensor, Mercury 350HP V10 fuel sensor, Mercury 400HP V10 fuel sensor, Mercury 425HP V10 fuel sensor, Mercury 500HP V12 fuel sensor, Mercury 600HP V12 fuel sensor, 8M0166596, Mercury water separating fuel filter sensor

Item#:
8M0157779
Cross Reference#:
8M0157779
Manufacturer Item:
8M0157779
Manufacturer:
Mercury Marine
Available:
In Stock
Your Price:
64.99
Each
Mercury 2.5L 150-225HP Pro Max 1992 & Up 3.500 Bore
Item#:
9500R
Cross Reference#:
840684A12
Manufacturer Item:
840684A12
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
61.15
Each
Item#:
7950XX
Manufacturer:
Yamaha Outboard
Available:
In Stock
Your Price:
31.15
Each
Mercury 2.5L 150-225HP Pro Max 1992 & Up 3.530 Bore
Item#:
9530R
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
61.15
Each
Yamaha 3.3L HPDI 2004-Up Bore Size 3.661"
Item#:
4900
Cross Reference#:
6D0-11603-00-00
6D0-11603-01-00
6011
Manufacturer Item:
6D0-11603-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
30.89
Each
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