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Mercury Fuel System
Mercury 2.5L Optimax DFI Fuel Injector 804841
Mercury 804841 is a fuel injector used on select 2.5L DFI and Optimax outboard engines. It is commonly found in the fuel rail assembly on 110-200HP direct fuel injection two-stroke powerheads.
This injector is commonly associated with V-115, V-135, V-150, V-175, and 200HP DFI applications, including some XS, Racing, Sport Jet, M2 Jet Drive, and select 3.0L DSI models. Because injector usage can vary by serial number, verify your OEM diagram before ordering.
Compatible Applications
| Brand | Engine / System | Application | Fitment Note |
|---|---|---|---|
| Mercury / Mariner | 2.5L DFI / Optimax 110-200HP | Fuel rail injector | Verify by serial number and injector location |
| Mercury / Mariner | V-115, V-135, V-150, V-175 DFI | Direct fuel injection system | Used where OEM number 804841 is listed |
| Mercury | 200 DFI Sport Jet and M2 Jet Drive | Fuel injector / fuel rail assembly | Confirm by jet drive model and serial number |
| Mercury | Select 3.0L DSI applications | Fuel injection system | Verify exact engine diagram before ordering |
Important Fitment Note
DFI fuel injectors can vary by engine family, serial number, cylinder location, and fuel rail assembly. Always confirm compatibility using your engine serial number, model, and existing injector part number before ordering.
OEM & Cross Reference Numbers
| Mercury OEM Number | 804841 |
| Description | Fuel Injector |
| Known Supersessions | No supersession provided |
What This Part Is Used For
This fuel injector meters fuel into the direct fuel injection system on select Mercury DFI and Optimax engines. It works as part of the fuel rail assembly to help deliver the correct fuel amount for combustion.
A worn, clogged, leaking, or failed injector can cause rough running, hard starting, poor acceleration, excessive fuel use, misfires, or engine fault codes. Injector replacement should be matched to the correct OEM part number and engine serial number.
Key Features and Benefits
- Fuel injector for select Mercury and Mariner DFI / Optimax outboards
- Commonly used on 2.5L 110-200HP direct fuel injection engines
- Fits select V-115, V-135, V-150, V-175, and 200HP DFI applications
- Also associated with some Sport Jet, M2 Jet Drive, XS, Racing, and 3.0L DSI models
- Important replacement part for restoring proper fuel delivery
- Sold individually unless otherwise stated on the product page
FAQ
What is Mercury 804841?
Mercury 804841 is a fuel injector used on select DFI and Optimax fuel injection systems.
Does this fit all Optimax engines?
No. It fits select 2.5L DFI / Optimax engines and some related applications. Always confirm by engine serial number and OEM parts diagram.
What symptoms can a bad injector cause?
A faulty injector may cause rough idle, hard starting, poor acceleration, misfires, excessive fuel consumption, or engine performance issues.
Should injectors be matched by serial number?
Yes. DFI injector applications can be specific to engine model, serial range, and fuel rail configuration. Serial number verification is recommended before ordering.
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 fuel injector, Mercury Optimax injector, Mercury DFI injector, Mercury 2.5L DFI fuel injector, Mercury 115 DFI injector, Mercury 135 DFI injector, Mercury 150 DFI injector, Mercury 175 DFI injector, Mercury 200 DFI injector, Mercury Sport Jet injector, M2 Jet Drive injector
Searchable Part Numbers
804841
840481T01
840481001
883381
149125
149125
Sierra Mercury Carburetor Float
Replacement WME Carb Float for Mercury & Mariner 2-Stroke Outboards
This Sierra 18-72000 carburetor float replaces Mercury / Quicksilver OEM part number 1395-9594.
The float is used inside compatible Mercury and Mariner WME carburetors to regulate fuel level within the carburetor bowl for proper fuel metering and dependable engine performance.
Compatible Applications
| Engine Range | Engine Type | Carburetor Family | Application Notes |
|---|---|---|---|
| Mercury / Mariner 30HP-40HP | 2-Stroke | WME Carburetors | Select 2-cylinder carbureted models using float 1395-9594 |
| Mercury / Mariner 50HP-75HP | 2-Stroke | WME Carburetors | Select 3-cylinder carburetor assemblies using compatible WME carburetors |
| Mercury / Mariner 80HP-125HP | 2-Stroke | WME Carburetors | Select 3-cylinder and 4-cylinder carbureted applications |
| Mercury XR / Sea Pro Models | 2-Stroke | WME Carburetors | Used in select commercial and performance carbureted outboards |
A damaged or fuel-soaked float may cause flooding, rich-running conditions, fuel leakage, hard starting, poor idle quality, or hesitation during acceleration.
Mercury used several WME carburetor variations across the 30HP-125HP range. Always verify your engine serial number and carburetor number before ordering carburetor components.
OEM Part Numbers & Cross References
| Reference Type | Part Number |
|---|---|
| Sierra | 18-72000 |
| Mercury / Quicksilver OEM | 1395-9594 |
| Alternate Search Format | 13959594 |
OEM Mercury Float Option
Looking for the OEM Mercury / Quicksilver carburetor float?
See the OEM Mercury 1395-9594 Carburetor Float .
Related Carburetor Repair Kit
This carburetor float is commonly used with the following carburetor rebuild kit:
Sierra 7211-1 Carburetor Kit with Needle
What a Carburetor Float Does
The carburetor float works together with the needle and seat assembly to maintain proper fuel level inside the carburetor bowl.
Maintaining the correct fuel level helps provide stable idle, clean throttle response, proper fuel delivery, and reliable engine operation.
Over time, carburetor floats may absorb fuel, crack, stick, or lose buoyancy, causing flooding or inconsistent fuel delivery.
Replacing worn carburetor floats during carburetor rebuild service helps restore reliable fuel system performance.
Features and Benefits
- Sierra aftermarket carburetor float
- Replaces Mercury / Quicksilver OEM 1395-9594
- Fits select Mercury and Mariner 30-125HP 2-stroke outboards
- Compatible with many WME carburetor applications
- Helps maintain proper carburetor fuel level
- Useful for flooding and fuel delivery repairs
- Common replacement during carburetor rebuild service
- Aftermarket alternative to OEM Mercury carburetor floats
Carburetor Float Details
- Brand: Sierra
- Part Number: 18-72000
- Part Type: Carburetor Float
- Replaces OEM: Mercury 1395-9594
- Application: Mercury / Mariner 2-Stroke Carburetors
- Horsepower Range: 30HP-125HP
- Carburetor Family: WME
- System: Fuel / Carburetor
- Quantity Sold: Each
FAQ
What does Sierra 18-72000 replace?
This float replaces Mercury / Quicksilver OEM carburetor float 1395-9594.
What outboards use this carburetor float?
This float fits select Mercury and Mariner carbureted 2-stroke outboards from approximately 30HP through 125HP.
What carburetors use this float?
It is commonly used in compatible WME carburetor applications.
What happens if a carburetor float fails?
A damaged float may cause flooding, fuel leakage, poor idle quality, rich-running conditions, or hard starting.
Is this the same float used in the Sierra carburetor kit?
Yes. This float is commonly associated with the Sierra 7211-1 carburetor repair kit with needle.
Should I verify the carburetor model before ordering?
Yes. Mercury used several WME carburetor variations across these horsepower ranges, so carburetor number verification is recommended.
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.
- Fuel system components should be installed only after confirming correct fitment.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
18-72000, 1395-9594, Mercury carburetor float, Mercury float 1395-9594, Mariner carb float, Mercury WME carb float, Sierra carb float, Sierra 7211-1, Mercury carburetor rebuild parts, Mercury fuel system float, Mercury carburetor bowl float, Mercury 30HP carb float, Mercury 40HP carb float, Mercury 50HP carb float, Mercury 60HP carb float, Mercury 75HP carb float, Mercury 90HP carb float, Mercury 115HP carb float, Mercury 125HP carb float
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