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Mercury Fuel Supply Module / VST Seal Kit
Mercury FSM / VST Seal Kit - Pro Marine 7333 - Replaces 8M0133370
The Pro Marine 7333 Fuel Supply Module Seal Kit replaces Mercury OEM 8M0133370 and is used when servicing compatible Mercury Fuel Supply Module (FSM) / VST assemblies.
Fitment covers an unusually broad range of Mercury products including select 65-150HP EFI outboards, L6 Verado, 3.4L V6, 4.6L V8, 5.7L V10, 7.6L V12, Mercury Racing, MerCruiser 4.5L / 6.2L, MIE and TowSports engines.
Because Mercury uses different fuel pumps inside these modules depending on engine family and serial range, the correct low-pressure, high-pressure, feed and lift pump options are organized further down this page.
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Pro Marine | 7333 |
| Mercury OEM | 8M0133370 |
Mercury FSM / VST Seal Kit Fitment
The 7333 / 8M0133370 seal kit fits all of the engine families listed below. The individual fuel pumps inside the module vary by model and serial range, but this seal kit is common across these compatible Fuel Supply Module applications.
| Engine Family | Verified Applications | Serial Information |
|---|---|---|
| Mercury 65-115HP EFI | 65 EFI Jet, 75 EFI, 75 SeaPro, 80 EFI, 80 EFI Jet, 90 EFI, 90 SeaPro, 100 EFI, 115 EFI, 115 SeaPro and 115 Pro XS | Most applications 2B095049 & Present; 115 Pro XS 2B225488 & Present |
| Mercury 105-150HP EFI | 105 EFI Jet, 135 EFI, 150 EFI, 150 EFI SeaPro and 150 EFI Pro XS | Includes 1B905505 & Present, 2B131942 & Present, 2B139139 & Present, 2B550139 & Present and later applications |
| Mercury L6 Verado | 200, 225, 250, 275 and 300HP Verado; 200, 250 and 300HP Pro Verado | Includes 2B144123 thru 2B577715 / 2B578935 depending on configuration |
| Mercury 2.6L L6 Verado / Racing | 350 Verado, 350 Pro Verado, 400 Verado and 400R Racing | Includes 2B141124 / 2B141617 / 2B618256 thru 3B342962 |
| Mercury 3.4L V6 | 175, 200 and 225HP; 200 SeaPro and 175 Pro XS | 2B529482 & Present |
| Mercury 3.4L V6 Racing | 150R, 200R, 200R 15-inch Midsection and 200 ROS | 3B547096 & Present on standard Racing models; select 15-inch models 1E054618 & Present |
| Mercury 4.6L V8 | 250 and 300HP standard V8; 225 / 250 SeaPro; 300 CMS SeaPro and AMS SeaPro | 2B529482 & Present |
| Mercury 4.6L V8 Pro XS / Verado | 200, 225, 250 and 300 Pro XS; 250 and 300 Verado | 2B529482 & Present |
| Mercury 4.6L V8 Racing | 250R, 300R, 300R AMS Racing, 300R / 300 ROS 15-inch and 450R | Includes 1E080500 & Present, 1E081459 & Present, 1E054618 & Present and 1E083006 thru 1E099720 |
| Mercury 500R 4.6L V8 Racing | 500R Racing | 1E099432 & Present |
| Mercury 5.7L V10 | 350 Verado, 350 SeaPro, 400 Verado, 400R Racing and 425 Verado | Includes 3B266064, 3B272954 and later serial ranges |
| Mercury 7.6L V12 SeaPro | 500HP and 600HP SeaPro | 3B060047 & Present |
| MerCruiser 4.5L MPI | 200 and 250HP Alpha / Bravo including EC versions | Multiple FSM generations including 2A441953 thru 2A530777 and later |
| MerCruiser 6.2L MPI | 300 and 350HP including EC versions | Multiple FSM generations including 2A456613 thru 2A530775 and later |
| Mercury 6.2L TowSports | 320 and 370HP including EC versions | Includes 2A456613 thru 2A530773 and later applications |
| Mercury 6.2L MIE / Inboard | MIE 300, MIE 350, EC 300, EC 350 and Jet 370 | Multiple Fuel Supply Module generations |
Mercury changed the fuel pumps inside the FSM at different serial breaks while continuing to use this seal kit on many applications.
Use the engine family and serial number to select the correct pump from the guide below. Do not choose an FSM pump by horsepower alone.
Mercury FSM Fuel Pump Selection Guide
Use this section to identify the pumps commonly found inside the Fuel Supply Module that uses the 7333 / 8M0133370 seal kit.
Low-Pressure Fuel Pumps
The low-pressure pump keeps the Fuel Supply Module supplied with fuel so the high-pressure side can operate correctly.
65-150 EFI - FSM Range 2B494019 thru 3B694498
Also used in compatible 200-300R 4.6L V8, 200-400HP L6 Verado, 175-225HP V6 and 200-300HP V8 applications.
Mercury OEM 883202 Low-Pressure Fuel Pump
Genuine Mercury low-pressure electric fuel pump for compatible FSM applications.
Pro Marine Replacement for 883202
Pro Marine aftermarket low-pressure FSM fuel pump for compatible Mercury applications.
65-150 EFI - 3B681565 & Present
Mercury 8M0245917 Low-Pressure Fuel Pump
Later low-pressure FSM pump used on select 65-150HP EFI applications, including the later FSM configuration.
View Mercury 8M0245917 Pump450R 4.6L V8 Racing
Special Order - Contact Pro Marine for availability.
High-Pressure Fuel Pumps
The high-pressure pump supplies the fuel pressure required by the electronic fuel-injection system.
200-300R 4.6L V8 & 200-400HP L6 Verado
Pro Marine 3288P High-Pressure Fuel Pump
High-pressure FSM pump for compatible L6 Verado and modern Mercury V6 / V8 applications.
View Pro Marine 3288P65-150 EFI - FSM Range 2B494019 thru 3B694498
EMP 39612 High-Pressure Fuel Pump
High-pressure FSM fuel pump for select 65-150HP EFI applications using the earlier compatible FSM configuration.
View EMP 39612 High-Pressure Pump65-150 EFI - 3B681565 & Present
Mercury 8M0245916 High-Pressure Fuel Pump
Later high-pressure Fuel Supply Module pump for compatible 65-150HP EFI, MerCruiser 4.5L / 6.2L, MIE and TowSports applications.
View Mercury 8M0245916 Pump450R 4.6L V8 Racing
Special Order - Contact Pro Marine for availability.
500R & V12 Fuel Pumps
Later high-output Racing and V12 engines use separate feed and lift pump configurations.
Feed Pump - Mercury 8M0179359
Applications:
Mercury 500R 4.6L V8 Racing
Mercury 500-600HP 7.6L V12
Special Order - Contact Pro Marine for availability.
Lift Pump - Mercury 8M0179358
Applications:
Mercury 500R 4.6L V8 Racing
Mercury 500-600HP 7.6L V12
Special Order - Contact Pro Marine for availability.
What This Seal Kit is Used For
Mercury Fuel Supply Modules contain electric fuel pumps, fuel passages, regulators and sealing surfaces that must remain fuel-tight. Whenever the module is disassembled for pump replacement or internal service, the O-rings and seals should be carefully inspected.
The Pro Marine 7333 / Mercury 8M0133370 seal kit provides replacement seals for compatible FSM assemblies so the module can be properly resealed during service.
When Should I Replace the FSM Seals?
- Whenever the Fuel Supply Module is opened for major service
- When replacing a high-pressure fuel pump
- When replacing a low-pressure fuel pump
- When existing seals are flattened, swollen, cracked or damaged
- When repairing an FSM fuel leak
- When contamination or deterioration is found during disassembly
Why Service the Entire Fuel Supply Module?
Fuel-pressure problems can originate on either side of the FSM. A weak low-pressure pump can starve a perfectly good high-pressure pump, while a failed high-pressure pump may prevent the EFI system from reaching operating pressure even when the module has plenty of fuel.
Before replacing components, test both fuel delivery and fuel pressure. If the module must be opened, inspect both pumps, electrical connections, fuel passages and all seals while access is available.
Key Features and Benefits
- Pro Marine Fuel Supply Module / VST seal kit
- Replaces Mercury OEM 8M0133370
- Fits a broad range of Mercury FSM applications
- Fits select 65-150HP EFI outboards
- Fits L6 Verado 200-400HP applications
- Fits modern Mercury 3.4L V6 engines
- Fits modern Mercury 4.6L V8 engines
- Fits select Mercury Racing 150R-500R applications
- Fits select Mercury 5.7L V10 applications
- Fits select 500-600HP 7.6L V12 applications
- Fits select MerCruiser 4.5L and 6.2L engines
- Fits select MIE and TowSports Fuel Supply Modules
- Low-pressure and high-pressure pump options organized above
FAQ
What OEM number does Pro Marine 7333 replace?
Pro Marine 7333 replaces Mercury FSM seal kit
8M0133370.
Is this a VST seal kit or an FSM seal kit?
It is used to reseal compatible Mercury Fuel Supply Module assemblies.
These fuel modules are also commonly referred to as VST / fuel module
assemblies when discussing marine EFI fuel-system service.
Does this fit Mercury L6 Verado?
Yes. Fitment includes numerous 200-400HP L6 Verado, Pro Verado and Racing
applications shown above.
Does this fit Mercury 3.4L V6 and 4.6L V8 engines?
Yes. The verified fitment includes multiple V6, V8, SeaPro, Pro XS,
Verado and Racing configurations.
Does it fit the Mercury V10?
Yes. The supplied Mercury catalog fitment includes select 5.7L V10
Verado, SeaPro and Racing applications.
Does it fit Mercury V12 engines?
Yes. Verified fitment includes select 500HP and 600HP 7.6L V12 SeaPro
applications.
Does it fit MerCruiser engines?
Yes. The fitment includes select 4.5L MPI and 6.2L MPI MerCruiser,
MIE and TowSports Fuel Supply Modules.
Which fuel pump goes with this seal kit?
There is no single pump for every application. The correct low-pressure
and high-pressure pumps vary by engine family and FSM serial range.
Use the Fuel Pump Selection Guide above.
Should the seals be replaced when changing an FSM pump?
Inspect the seals whenever the Fuel Supply Module is opened. Replacing worn,
damaged or disturbed seals while the module is apart helps prevent having to
disassemble the FSM again for a leak.
How do I confirm fitment?
Verify the engine model and serial number and confirm that the Mercury
Fuel Supply Module diagram calls for seal kit
8M0133370.
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
7333, Pro Marine 7333, 8M0133370, Mercury 8M0133370, Mercury FSM seal kit, Mercury VST seal kit, Mercury Fuel Supply Module seal kit, Verado FSM seal kit, Verado VST seal kit, Mercury fuel module O ring kit, Mercury fuel module gasket kit, Mercury 65 EFI FSM seal kit, Mercury 75 EFI FSM seal kit, Mercury 90 EFI FSM seal kit, Mercury 115 EFI FSM seal kit, Mercury 150 EFI FSM seal kit, Mercury L6 Verado FSM seal kit, Mercury 200 Verado seal kit, Mercury 250 Verado seal kit, Mercury 300 Verado seal kit, Mercury 350 Verado seal kit, Mercury 400 Verado seal kit, Mercury 400R FSM seal kit, Mercury 450R FSM seal kit, Mercury 500R FSM seal kit, Mercury 3.4L V6 FSM seal kit, Mercury 4.6L V8 FSM seal kit, Mercury 5.7L V10 FSM seal kit, Mercury 7.6L V12 FSM seal kit, Mercury 500 V12 seal kit, Mercury 600 V12 seal kit, MerCruiser 4.5L FSM seal kit, MerCruiser 6.2L FSM seal kit, Mercury MIE FSM seal kit, Mercury TowSports FSM seal kit, 883202, 1-32-883202, 8M0245917, 3288P, 39612, 8M0245916, 8M0161399, 8M0161400, 8M0179358, 8M0179359
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
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