Mercury 150-300 HP 2-Stroke EFI Outboard Fuel Injector Cleaning & Flow Testing

The Mercury 18715 is a MPFI marine (2-stroke EFI) fuel injector used in Mercury 2-stroke EFI V6 outboards: 150, 175, 200, 225, 250, 300 HP (1998-2005); also Mercury Racing 300X 3.0L. 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	18715
Type	MPFI marine (2-stroke EFI)

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Our measured results

These are the actual before-and-after numbers from our flow bench for the Mercury 18715 — not published estimates.

Tested in our shop	6 injector(s) @ 40.0 psi
Measured coil (avg)	2.5 Ω
10s open flow (avg)	80.5 → 82.67 ml (+2.7%)
60s pulsed flow (avg)	70.83 → 71.5 ml
Leak test after cleaning	6/6 PASS

Also known as / cross-references

The Mercury 18715 is interchangeable with or cross-references to these part numbers:

18715T118715T14627840481

What vehicles use the Mercury 18715?

Mercury 2-stroke EFI V6 outboards: 150, 175, 200, 225, 250, 300 HP (1998-2005); also Mercury Racing 300X 3.0L

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 18715 injector?

The Mercury 18715 is used in Mercury 2-stroke EFI V6 outboards: 150, 175, 200, 225, 250, 300 HP (1998-2005); also Mercury Racing 300X 3.0L.

Can you clean and test a 18715 injector?

Yes. We ultrasonic-clean, backflush, and flow-test the Mercury 18715 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 18715 flow at?

On our bench, 6 18715 injectors averaged 80.5 ml open flow before cleaning and 82.67 ml after, tested at 40.0 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 18715 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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