Fuel Injector – Fits Mercury/Tohatsu 25HP-30HP 4-Stroke (Replaces 8M0091784, 898101T74, 3AC-10300-1, 3AC-10300-0)
Fuel Injector – Fits Mercury/Tohatsu 25HP-30HP 4-Stroke (Replaces 8M0091784, 898101T74, 3AC-10300-1, 3AC-10300-0) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Fuel Injector – Fits Mercury/Tohatsu 25HP-30HP 4-Stroke (Replaces 8...
Fuel Injector – Fits Mercury/Tohatsu 25HP-30HP 4-Stroke (Replaces 8M0091784, 898101T74, 3AC-10300-1, 3AC-10300-0) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Fuel Injector – Fits Mercury/Tohatsu 25HP-30HP 4-Stroke Outboards (Replaces 8M0091784) is engineered for Mercury and Tohatsu 25HP and 30HP 4-Stroke outboard engines manufactured between 2006 and 2014, ensuring reliable fuel delivery and engine performance.
It serves as a direct interchange for Mercury part numbers 8M0091784 and 898101T74, as well as Tohatsu numbers 3AC-10300-1 and 3AC-10300-0.
- Designed for simple, direct replacement installation.
- Compatible with standard gasoline fuel types.
- Features a factory-style electrical connector and fuel line attachment.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 8M0091784 | |
| Mercury | 898101T74 | |
| Tohatsu | 3AC-10300-1 | |
| Tohatsu | 3AC-10300-0 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is verified for the following Mercury and Tohatsu models. Ensure your model and year range match for correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 1A25203EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A25203FL | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A25213EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A25301EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A25311EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A25413EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A2C211HK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A2C301HK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A2C311HK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G271EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G371EK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G371HK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1B25203FB | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1B25312FB | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 7A25203UL | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 7A25311UK | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 7A25312UL | 25 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30411EM | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30411HL | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30413EK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30413FK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30413FM | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30472EK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G203EK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G203FK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G203FL | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G203FM | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A3G213EK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 7A3G311UK | 30 | 4-Stroke | 2006 | 8M0091784 | |
| Mercury | 1A30413KZ | 30 | 4-Stroke | 2010 | 8M0091784 | |
| Mercury | 7A30413VZ | 30 | 4-Stroke | 2010 | 8M0091784 | |
| Tohatsu | F15AMH | 15 | 4-Stroke | 1999 | 3AC-10300-1 | Cross-reference compatibility |
Technical Specs
- Product Type
- Electronic Fuel Injector
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Connection
- Electrical connector with fuel line attachment
- Housing Material
- Metal with plastic connector
- Housing Color
- Black
- Box Dimensions
- 8 x 4.5 x 3.5 cm
- Product Volume
- 126 cm³
- Warranty
- 1 year (aftermarket parts)
What’s in the Box
- 3 x Fuel Injector (8M0091784)
Installation Notes
- Ensure the engine is cool and disconnect the battery's negative terminal for safety.
- Carefully relieve the pressure from the fuel system according to the manufacturer's service manual.
- Disconnect the electrical connectors from the existing fuel injectors.
- Remove the fuel rail mounting bolts and carefully lift the rail with injectors away from the engine.
- Remove the retaining clips and pull the old injectors from the fuel rail. Note their orientation.
- Lubricate the O-rings on the new injectors with clean engine oil and press them firmly into the fuel rail.
- Reinstall the retaining clips and mount the fuel rail back onto the engine, tightening bolts to the specified torque.
- Reconnect the electrical connectors to each new injector.
- Reconnect the battery terminal, prime the fuel system, and turn the key to the 'On' position (without starting) to check for leaks.
- If no leaks are present, start the engine and let it run, checking again for any signs of fuel leakage.
Troubleshooting & FAQ
How do I confirm this injector fits my engine?
The best way is to check the part number on your original injector. If it matches any of the numbers in our Part Number Matrix, it will fit. You can also review the Compatibility table to find your engine model, HP, and year.
What are common signs of a bad fuel injector?
Symptoms of a failing fuel injector include rough idling, engine misfires, poor acceleration, increased fuel consumption, or difficulty starting the engine. A diagnostic scan tool may also show fuel trim or misfire error codes.
Can I install these injectors myself?
While installation is possible for those with mechanical experience, it involves working with the fuel system, which can be hazardous. We recommend professional installation to ensure safety, proper seating, and leak-free operation.
How often should fuel injectors be replaced?
Fuel injectors do not have a fixed replacement interval. They are typically replaced only when they fail. Using high-quality fuel and occasional fuel system cleaner can help prolong their lifespan.
Is there a break-in period for new injectors?
There is no specific break-in period. Once installed correctly, they should perform optimally immediately. The engine's computer (ECU) may take a short time to adapt to the new injectors' flow rates.
Why does the kit include three injectors?
It is best practice to replace fuel injectors as a complete set on an engine. This ensures balanced fuel delivery across all cylinders, leading to smoother operation and consistent performance.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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