Mercury MerCruiser 350 / 454 / 502 MAG MPI Fuel Injector Cleaning & Flow Testing

The Marelli IWP069 is a MPFI (port injection) fuel injector used in Mercury MerCruiser 350 MAG MPI, 454 MAG MPI, 502 MPI, 6.2L MPI, 8.2L MPI (1998-2002); Harley-Davidson; Ducati superbikes. 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	Marelli
Part number	IWP069
Type	MPFI (port injection)
Connector	EV1 (Jetronic Cone, single-hole disc at 15°)
Published flow	480 cc/min @ 3 bar
	46 lb/hr
Published impedance	13.7 Ω

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Our measured results

These are the actual before-and-after numbers from our flow bench for the Marelli IWP069 — not published estimates.

Tested in our shop	8 injector(s) @ 40.0 psi
Measured coil (avg)	14.59 Ω
10s open flow (avg)	73.14 → 72.0 ml (-1.6%)
60s pulsed flow (avg)	81.14 → 73.14 ml
Leak test after cleaning	7/8 PASS

Also known as / cross-references

The Marelli IWP069 is interchangeable with or cross-references to these part numbers:

861260T (Mercury OEM)IWP-069

What vehicles use the Marelli IWP069?

Mercury MerCruiser 350 MAG MPI, 454 MAG MPI, 502 MPI, 6.2L MPI, 8.2L MPI (1998-2002); Harley-Davidson; Ducati superbikes

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 Marelli IWP069 injector?

The Marelli IWP069 is used in Mercury MerCruiser 350 MAG MPI, 454 MAG MPI, 502 MPI, 6.2L MPI, 8.2L MPI (1998-2002); Harley-Davidson; Ducati superbikes.

Can you clean and test a IWP069 injector?

Yes. We ultrasonic-clean, backflush, and flow-test the Marelli IWP069 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 IWP069 flow at?

On our bench, 8 IWP069 injectors averaged 73.14 ml open flow before cleaning and 72.0 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 IWP069 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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