879312003 Rebuilt Upgrade Mercury Marine Fuel Injectors - 4.3L, 5.0L, 5.7L, 6.2L MPI
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Performance-rebuilt upgrade for Mercury Marine and Mercruiser MPI engines. Designed to replace OEM part 879312003, these injectors feature a multi-hole spray pattern for superior atomization, smoother idling, and improved throttle response. Fully flow-matched to within 1% and resistance-tested for maximum reliability in marine environments.
Optimized Performance for Mercury & Mercruiser Engines
Restore the power and efficiency of your marine engine with our 879312003 Rebuilt Upgrade Fuel Injectors. These injectors are not just standard replacements; they are meticulously refurbished and optimized through a three-step process to ensure they outperform original factory specifications.
Why Choose This Upgrade?
Unlike older single-pintle designs, these injectors utilize a modern multi-hole spray nozzle with a 30-degree dispersion angle. This creates a finer fuel mist, leading to more complete combustion, fewer misfires, and better fuel economy (MPG).
Technical Specifications:
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Resistance: 12.5 Ohms (OE Spec)
- Testing: Dynamically flow-matched within 1% for balanced power across all cylinders.
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Durability: Corrosion-resistant internal components specifically for saltwater and high-moisture use.
Fitment & Applications
Compatible with Mercury Marine, Mercruiser, Indmar, and Crusader engines (2007 and Newer) including:
| Engine Size | Model / Serial Range | Common Applications |
| 4.3L V6 | s/n 1A063240 & Up | MPI / Alpha / Bravo |
| 5.0L V8 | s/n 1A064825 & Up | 5.0L MPI / Alpha / Bravo |
| 5.7L V8 | s/n 1A064825 & Up | 350 MAG MPI / Horizon / Ski |
| 6.2L V8 | s/n 1A064825 & Up | MX 6.2L MPI / Horizon / MIE |
| 383 / 385 | All Performance Tuned | MAG Stroker / Performance Tuned |
Interchange Part Numbers:
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Mercury: 879312003
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Bosch: 0280158165
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Other: 885176, 12567905, MAR102-8N, M02081X8
Our Guarantee: Every injector comes with a Lifetime Guarantee. We stand behind our cleaning, flow-matching, and rebuilding process to keep you on the water longer.