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Mercury Outboard Parts
Shop OEM and aftermarket Mercury outboard parts for maintenance, repair, troubleshooting, and complete engine rebuild projects. Browse Mercury marine parts by system, including cooling, fuel delivery, electrical and ignition, internal engine components, lower unit parts, steering, trim, and routine service items.
Pro Marine USA carries Mercury outboard engine parts for a wide range of 2-stroke, FourStroke, EFI, Optimax, Pro XS, SeaPro, and Verado applications. Use your engine horsepower, model, serial number, or OEM part number whenever possible to confirm fitment before ordering.
Shop Mercury Outboard Parts 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
Find the Correct Mercury Outboard Part
Mercury outboard parts can vary by horsepower, engine family, model year, and serial number range. If you are unsure which component fits your engine, use the OEM parts lookup to locate the original Mercury part number from an engine diagram.
Once you have the OEM part number, search Pro Marine to find available genuine Mercury and aftermarket replacement options.
Use Our OEM Parts Lookup »Common Mercury Outboard Engine Families
Pro Marine supports many Mercury outboard applications across a wide horsepower range. Always confirm the engine serial number and model information before ordering parts.
- Portable and Midrange: Mercury 2.5HP through 60HP 2-stroke and FourStroke applications
- FourStroke and EFI: common 75HP through 300HP Mercury EFI and FourStroke platforms
- Pro XS: performance-oriented Mercury Pro XS outboards across multiple engine families
- Optimax: direct-injected 2-stroke Mercury Optimax engines, commonly 75HP through 250HP
- Verado: supercharged and naturally aspirated Mercury Verado applications from 135HP through current high-horsepower platforms
- SeaPro: commercial-duty Mercury SeaPro outboards used in professional and high-hour applications
Common Mercury Outboard Repair Areas
- Overheating: inspect the water pump, impeller, thermostat, poppet valve, cooling passages, and related cooling components.
- Hard starting or rough running: inspect fuel pumps, filters, injectors or carburetors, spark plugs, coils, sensors, and intake components.
- No spark or intermittent ignition: check ignition coils, stators, switch boxes, trigger assemblies, sensors, grounds, and wiring.
- Low compression or power loss: inspect pistons, rings, cylinders, bearings, gaskets, reeds, and internal engine components.
- Lower unit noise or water intrusion: inspect seals, bearings, gears, shafts, bearing carriers, and gear lube condition.
- Trim or steering problems: inspect trim motors, pumps, hydraulic components, steering cylinders, hoses, and related rigging parts.
Why Buy Mercury Outboard Parts from Pro Marine USA?
- OEM Mercury and aftermarket replacement options for many common applications.
- Parts for maintenance, repair, engine rebuilding, lower units, electrical systems, fuel systems, steering, trim, and rigging.
- OEM diagram and part-number lookup tools to help identify the correct part before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large inventory of Mercury service parts and hard-to-find marine engine components.
- Fast weekday shipping on qualifying in-stock orders.
Frequently Asked Questions
How do I find the correct Mercury outboard part?
Use the engine horsepower, model, serial number, and year whenever available. Mercury frequently uses serial-number ranges to identify engine families, so the serial number is often the most reliable way to confirm fitment.
Can I search Mercury parts by OEM part number?
Yes. Enter the Mercury OEM part number 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.
Do Mercury outboard parts vary by serial number?
Yes. Many Mercury components change by serial-number range even within the same horsepower or model family. Always compare the serial range listed for the part with your engine before ordering.
Do you carry parts for Mercury Optimax and Verado engines?
Yes. Pro Marine carries parts for many Mercury Optimax, Verado, Pro XS, EFI, FourStroke, and SeaPro applications, including maintenance, fuel, electrical, cooling, internal engine, lower unit, steering, and rigging components.
Do you carry both OEM and aftermarket Mercury parts?
Yes. Pro Marine offers genuine Mercury parts along with aftermarket replacement parts for many common Mercury outboard maintenance, repair, and rebuild applications.
What Mercury outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump kits, impellers, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Mercury outboard parts often vary by serial-number range. Confirm your engine serial number and OEM part number whenever possible before ordering.
822067A5
822067A7
822067T7
858295T1
858295T14
16756A2
16756A4
0766871
0777960
10-769
18-2543
318609
34310
766871
777960
802036
855431
39150
508892
64203A73
64203A74
9738A9
9738T9
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
850026A2
850026T2
8M0077473
883778A01
883778A02