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3F0060491
3F0060491M
3F0061530
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823033
817109A2
8M0077473
883778A01
883778A02
67F-81800-01-00
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818864
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96158T
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
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
Ignition System
Genuine Mercury Spark Plug - 8M0180173
OEM Mercury Iridium Spark Plug for 500-600hp V12 outboards.
Delivers reliable ignition, improved combustion efficiency, and longer service life.
Compatible Applications
Mercury V12 Outboards. Verify with your engine serial number for exact fitment.
Important Fitment Note
Always confirm compatibility using your engine serial number before ordering.
OEM & Cross Reference Numbers
| OEM | 8M0180173, 8M0178257 |
What This Part Is Used For
This iridium spark plug provides reliable ignition for Mercury V12 outboard engines.
Replacing spark plugs at recommended intervals improves starting, performance, and fuel efficiency.
Key Features and Benefits
- Genuine Mercury OEM quality
- Iridium electrode for longer life and better spark
- Optimized for high-performance V12 engines
- Improves combustion efficiency
FAQ
What engines does this spark plug fit?
Mercury V12 outboards. Verify with serial number.
How often should spark plugs be replaced?
Follow the Mercury service schedule for your specific model (typically every 100-200 hours or annually).
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.
- Parts must be new, unused, and in original packaging.
- Installed parts 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
Mercury V12 spark plug, 8M0180173, Mercury outboard spark plug, V12 iridium spark plug, 8M0178257
Searchable Part Numbers
8M0180173 8M0178257
8M0180173
689-81800-12-00
689-81800-13-00
689-81800-14-00
8M6007415
84917M
96359M
97693M
65W-81800-00-00
65W-81800-01-00
65W-81800-02-00
65W-81800-03-00
830308
830308T
859169T
86976
888151T
891754T
893886T
9-15017
6G8-81800-11-00
825991A2
3C8760101M
3GF760100
3GF760100M
3GF760101
3GF760101M
3RS760100
3RS760100M
31100-94400
31100-94401
31100-94402
31100-96301
31100-96310
31100-96311
8M0147039
8M0188334
8M6007365
853805T03
18-6410
3420
689-81800-12-00
689-81800-13-00
689-81800-14-00
7071
8M6007415
84917M
96359M
97693M