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Mercury Outboard Parts
Shop Mercury outboard motor parts by system, including cooling, fuel delivery, electrical, internal engine components, lower unit parts, and routine service items. Browse OEM and replacement Mercury marine parts to support maintenance, repair, and rebuild projects.
Shop by System
- Complete Powerheads
- Control Cables & Boxes
- Cooling System
- Cowlings & Components
- Electrical System
- Engine Oil
- Engine Rebuild Kits
- Fuel & Carburetion System
- Intake System
- Internal Engine Components
- Lower Unit Components
- Oiling System
- Paints
- Service & Oil Change Kits
- Service Manuals
- Steering Systems
- Throttle Components
- Transom & Midsection
- Trim System
- Wizard Performance Parts
Common Mercury Outboard Model References
This category supports many popular Mercury outboards across a wide horsepower range. Always confirm your model and serial number for best fitment.
- Portable & Midrange: 2.5HP–60HP (2-stroke & FourStroke)
- Performance: Pro XS and EFI platforms (75HP–300HP)
- Direct Injection: Optimax models (75HP–250HP)
- Premium Offshore: Verado models (135HP–400HP)
- Commercial: SeaPro models (commonly 75HP–300HP)
Always confirm your exact horsepower, model year, and serial number to ensure proper part compatibility before ordering.
881180A02
881180A03
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 |
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
Mercury Fuel Filter 8M0166596
OEM Mercury water-separating fuel filter used with this sensor on compatible 450R, 500R V8 and 500HP-600HP V12 applications.
View ProductWhat 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.
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
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509406
88392
88392A12
27841
27841A12
18-3902
45155A12
509398
78816A12
9-54217
18-3981
9-54231
96170A4
14920
18-3980
18-3980
96170A3
96170A3
14910
18-3979
18-3979
200-25
9-54229
96170
96170A12