Mercury OptiMax Blue Air Injector Fuel Injector Cleaning & Flow Testing

The Mercury 883078A3 is a DFI marine (air-assisted 2-stroke DI, air side) fuel injector used in Mercury OptiMax / DFI 2-stroke outboards and SportJet: the BLUE air injector. Mercury catalogs blue and black under separate part numbers, though on our bench both share the same body and tested the same. Match the color you removed until Mercury says otherwise.. We ultrasonic-clean and flow-test injectors like this one in our shop, then send back before-and-after data so you know exactly what you're getting.

Manufacturer	Mercury
Part number	883078A3
Type	DFI marine (air-assisted 2-stroke DI, air side)

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Our measured results

These are the actual before-and-after numbers from our flow bench for the Mercury 883078A3 — not published estimates.

Tested in our shop	12 injector(s) @ 50.0 psi
Measured coil (avg)	1.91 Ω
10s open flow (avg)	99.58 → 99.92 ml (+0.3%)
60s pulsed flow (avg)	91.17 → 91.08 ml
Leak test after cleaning	12/12 PASS

Also known as / cross-references

The Mercury 883078A3 is interchangeable with or cross-references to these part numbers:

8M60017438M0065916 (supersession)883078A4

What vehicles use the Mercury 883078A3?

Mercury OptiMax / DFI 2-stroke outboards and SportJet: the BLUE air injector. Mercury catalogs blue and black under separate part numbers, though on our bench both share the same body and tested the same. Match the color you removed until Mercury says otherwise.

How we service it

Every injector gets ultrasonic cleaning, backflushing, before-and-after flow testing (static and dynamic), leak testing, spray-pattern inspection, and new O-rings and micro-filter baskets where available — plus a detailed Injector Performance Report. Round-trip USPS shipping is $15 flat.

Frequently asked questions

What vehicles use the Mercury 883078A3 injector?

The Mercury 883078A3 is used in Mercury OptiMax / DFI 2-stroke outboards and SportJet: the BLUE air injector. Mercury catalogs blue and black under separate part numbers, though on our bench both share the same body and tested the same. Match the color you removed until Mercury says otherwise..

Can you clean and test a 883078A3 injector?

Yes. We ultrasonic-clean, backflush, and flow-test the Mercury 883078A3 on our bench, including before-and-after open and pulsed flow, leak testing, and spray-pattern inspection, with new O-rings where available.

What did the 883078A3 flow at?

On our bench, 12 883078A3 injectors averaged 99.58 ml open flow before cleaning and 99.92 ml after, tested at 50.0 psi.

How much does it cost?

Standard MPFI top-feed injectors are $30 each; side-feed, GDI, TBI and specialty injectors are $35 each. Round-trip shipping is $15 flat, 4-injector minimum.

How do I send them in?

Start an order on our Get Started page, ship your injectors to our Weymouth, MA shop, and we return them cleaned, tested, and documented.

Send in your 883078A3 injectors

Mail-in cleaning and flow testing with a full before/after report. 4-injector minimum, $15 flat round-trip shipping.

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