804528 Mercury Optimax Fuel Injector - 75HP to 225HP (Refurbished)
Proudly Accepting
Premium refurbished OEM fuel injector for Mercury Optimax 2-Stroke Direct Injection engines. Expertly serviced to restore factory flow rates and spray patterns for models ranging from 75HP to 225HP. This cost-effective, high-performance replacement ensures smooth idling, improved fuel economy, and reliable throttle response in demanding marine environments.
Professional Grade OEM Refurbished Fuel Injector
The 804528 Mercury Optimax Fuel Injector is a critical component for the specialized Direct Injection (DI) system found in Mercury Optimax outboards. Because these engines rely on precise fuel-to-air ratios, a clogged or failing injector can lead to poor performance or engine damage. Our refurbishment process restores these units to "like-new" performance at a fraction of the OEM price.
Our Refurbishment Process:
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Ultrasonic Cleaning: Multiple cycles to remove internal carbon deposits and salt buildup.
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Flow Matching: Tested and matched to within 2% of original factory flow specifications.
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Leak Testing: Pressure tested up to 100 PSI to ensure zero leakage.
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New Components: Fitted with brand-new high-temperature Viton O-rings and internal filters.
Fitment & Compatibility
This injector is a direct replacement for various Mercury Optimax (2-Stroke) engines. Please check your serial number or existing part number before ordering.
| Engine Series | Horsepower | Configuration |
| Mercury Optimax | 75 / 90 / 115 HP | 1.5L 3-Cylinder |
| Mercury Optimax | 135 / 150 / 175 HP | 2.5L V6 |
| Mercury Optimax | 200 / 225 HP | 3.0L V6 |
Interchange Part Numbers:
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Mercury: 804528, 804528T, 804528A1
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Note: This is the fuel injector (typically black/dark), not the air injector (typically blue/grey).
- Please note, we are not affiliated with Mercury Marine and are not an authorized Mercury dealer.
Maintenance Tip: When replacing fuel injectors on an Optimax, it is highly recommended to also inspect your fuel rails and air injectors to ensure the entire system is free of debris.