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MerCruiser® 879312003 Replacement Fuel Injector

OEM Reference: 879312003

MerCruiser® 879312003 Replacement Fuel Injector

DMP Part #DMP-879312003
OEM Reference879312003
Qty Required8 (verified V8 applications). Verify for 4.3L V6 — not confirmed.
Injector MfrVerification in Progress
Replacement Product Sourcing in Progress
879312003 applies to later ECM-555 MPI production from approximately 2007–2008. Earlier ECM-555 production (serial below 1A063240 for 4.3L; below 1A064825 for 5.0L / 350 / 6.2L) used a different injector — OEM 885176. Verify your exact engine model, serial number, and existing OEM injector reference before ordering.
MerCruiser® ECM-555 engines may use different injectors depending on engine model and serial range. A 4.3L, 5.0L, 5.7L/350 or 6.2L engine cannot be matched to an injector by displacement alone. Always verify using your engine serial number and existing OEM injector reference.

Engine Applications

The following application relationships are verified against Mercury Marine primary source documentation. Serial ranges are exact as supplied — do not generalise across variants. Verify your exact engine model, serial number, and existing OEM injector reference before ordering.

Engine ModelYearsSerial RangeStatus
MerCruiser® 350 MAG MPI ECM-555 — 350 V82007–20081A064825 and upVerified
MerCruiser® 350 MAG MPI DTS ECM-555 — 350 V82007–20081A064825 and upVerified
MerCruiser® 350 MAG MPI Horizon ECM-555 — 350 V820071A064825–1A299999Verified
MerCruiser® 350 MAG MPI Horizon MIE ECM-555 — 350 V820071A064825–1A089999Verified
MerCruiser® 350 MAG MPI MIE ECM-555 — 350 V820071A064825–1A089999Verified
MerCruiser® 5.7L MPI Horizon MIE ECM-555 — 350 V820081A090000 and upVerified
MerCruiser® 5.7L MPI MIE ECM-555 — 350 V820081A090000 and upVerified
MerCruiser® MX 6.2L MPI ECM-555 — 377 V820071A064825–1A299999Verified
MerCruiser® MX 6.2L MPI DTS ECM-555 — 377 V820071A064825–1A299999Verified
MerCruiser® MX 6.2L MPI Horizon ECM-555 — 377 V820071A064825–1A299999Verified
MerCruiser® MX 6.2L MPI Horizon MIE ECM-555 — 377 V82007–20081A064825 and upVerified
MerCruiser® MX 6.2L MPI MIE ECM-555 — 377 V820071A064825–1A089999Verified
MerCruiser® MX 6.2L MPI MIE DTS ECM-555 — 377 V820071A064825–1A089999Verified
MerCruiser® 4.3L MPI ECM-555 — 262 V62007–20081A063240 and upVerified
MerCruiser® 5.0L MPI ECM-555 — 305 V82007–20081A064825 and upVerified
MerCruiser® 5.0L MPI DTS ECM-555 — 305 V820081A064825 and upVerified

Technical Specifications

Specifications are under verification. Fields will be updated as OEM and manufacturer data is independently confirmed.

OEM Reference879312003
Superseded OEM ReferenceVerification in Progress
Injector ManufacturerVerification in Progress
Manufacturer Part NumberVerification in Progress
Flow RateVerification in Progress
Operating PressureVerification in Progress
Electrical ResistanceVerification in Progress
Connector TypeVerification in Progress
Quantity Required (V8)8

Related OEM Service References

The following OEM reference is associated with 879312003 injector service. Displayed for informational purposes only. Not in stock — do not order based on this reference alone.

8M0046869Related OEM Injector Service / O-Ring ReferenceNot in stock — informational only

Visual Identification

Visual identification details — body colour, connector type, and manufacturer markings — are under verification. Remove an existing injector and compare physical characteristics against confirmed OEM documentation before ordering.

What's Included

Package contents will be confirmed once a verified replacement product is sourced. Injector O-rings and seals are typically sold separately — inspect and replace as needed.

How to Verify Fitment

Step 1.Confirm the full MerCruiser engine model designation — not just displacement. ECM-555 covers multiple engine families across different production periods, and the same displacement may use a different injector depending on serial range.
Step 2.Locate the engine serial number plate and record the serial number. For 4.3L engines, the 879312003 applies from serial 1A063240 and up. For 5.0L, 350 Mag, and MX 6.2L variants, from serial 1A064825 and up (varies by variant).
Step 3.Remove one existing injector and read the OEM part number stamped or printed on the body. This is the most reliable confirmation of the correct replacement.
Step 4.Cross-reference the OEM number against the ECM-555 generation matrix before ordering. If your serial number falls below the 879312003 range, the earlier 885176 may apply — verify before ordering.

Customers Replacing This Part Also Consider

These parts are not necessarily required — inspect related components and replace only as needed.

Also Browse

ECM-555 MPI All PartsECM-555 Injector ID Guide885176 — Earlier ECM-555 Generation350 MPI / 5.7L PartsAll Marine Fuel Injectors