Volvo Penta 4.3 / 5.0 / 6.2L Sterndrive Fuel Injector Cleaning & Flow Testing

The Bosch 879312003 is a MPFI marine fuel injector used in Volvo Penta 4.3L, 5.0L, 5.3L, 6.2L sterndrive (2007+); GM Vortec architecture. 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	Bosch
Part number	879312003
Type	MPFI marine

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Our measured results

These are the actual before-and-after numbers from our flow bench for the Bosch 879312003 — not published estimates.

Tested in our shop	6 injector(s) @ 40.0 psi
Measured coil (avg)	12.87 Ω
10s open flow (avg)	45.0 → 45.33 ml (+0.7%)
60s pulsed flow (avg)	52.0 → 52.33 ml
Leak test after cleaning	6/6 PASS

What vehicles use the Bosch 879312003?

Volvo Penta 4.3L, 5.0L, 5.3L, 6.2L sterndrive (2007+); GM Vortec architecture

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 Bosch 879312003 injector?

The Bosch 879312003 is used in Volvo Penta 4.3L, 5.0L, 5.3L, 6.2L sterndrive (2007+); GM Vortec architecture.

Can you clean and test a 879312003 injector?

Yes. We ultrasonic-clean, backflush, and flow-test the Bosch 879312003 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 879312003 flow at?

On our bench, 6 879312003 injectors averaged 45.0 ml open flow before cleaning and 45.33 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 879312003 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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