Fuel Injector – Fits Mercruiser 8.1L/496 MAG/496 HO MPI Engines (Replaces 881693002, 3861278)

Vendor: JLM Marine
Availability: In Stock
Product Type: Fuel Injector
$26.50
$26.50
Subtotal: $26.50

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Fuel Injector – Fits Mercruiser 8.1L/496 MAG/496 HO MPI Engines (Replaces 881693002, 3861278) - JLM Marine Boat Parts Limited

Fuel Injector – Fits Mercruiser 8.1L/496 MAG/496 HO MPI Engines (Replaces 881693002, 3861278)

$26.50

Fuel Injector – Fits Mercruiser 8.1L/496 MAG/496 HO MPI Engines (Replaces 881693002, 3861278)

$26.50

Fuel Injector – Fits Mercruiser 8.1L/496 MAG/496 HO MPI Engines

This multi-port fuel injector is designed for Mercruiser 8.1L/496 cubic inch engines (including 8.1S MPI, 8.1L HO, 496 MAG, and 496 HO models) from 2004 and later equipped with Multi-Port Injection (MPI) systems. It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 881693002, 881693001, and 3861278. The injector features a metal housing and a 3-hole disc nozzle based on the Delphi design, connecting via a standard Delphi Multec II electrical interface.

  • Installation Method: Direct OEM replacement
  • Fuel Compatibility: Gasoline
  • Included Components: 1 x Fuel Injector with pre-installed O-rings

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number Superseded By Notes
Mercury 881693002 8M0221353 Primary replacement number for 496/8.1L engines.
Mercury 881693001 881693002 Older version.
Volvo Penta 3861278 Used in corresponding Volvo Penta 8.1L engines.
Crusader RA087006
Delphi 25348180 Original injector manufacturer part number.
Delphi 25176061 Original injector manufacturer part number.
GM 17116061 Original injector manufacturer part number.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 496 MAG 375 4-Stroke 2004 and later 881693002 MPI models
MerCruiser 496 HO 425 4-Stroke 2004 and later 881693002 MPI models
MerCruiser 8.1S MPI 370 4-Stroke 2004 and later 881693002
MerCruiser 8.1L HO 420 4-Stroke 2004 and later 881693002

Technical Specifications

Specification Value
Product Type Multi-Port Fuel Injector
Installation Direct OEM replacement
Fuel Type Gasoline
Connection Delphi Multec II electrical connector
Housing Material Metal
Nozzle Design 3-hole disc (Delphi design)
Overall Length 58 mm (2-5/16 inches)
O-ring to O-ring 48 mm (1-7/8 inches)
Body Diameter 17 mm
O-Ring Diameter 14.5 mm (Upper/Lower Viton)
Resistance 12.0-12.5 Ohms
Gross Weight G
Package Dimensions 8 x 4.5 x 3.5 cm
Product Volume 126 cm³

Package Contents

  • 1 x Fuel Injector (Replaces 881693002/3861278/25348180)

Installation Guide

  1. Relieve Fuel Pressure: Safely relieve the pressure from the fuel system according to the manufacturer's service manual.
  2. Disconnect Battery: Disconnect the negative terminal of the battery.
  3. Disconnect Injector: Unplug the electrical connector and carefully disconnect the fuel line from the injector.
  4. Remove Retainer: Remove the retaining clip or bolts holding the fuel injector in place.
  5. Extract Old Injector: Gently twist and pull to remove the old injector from the fuel rail. Be prepared for minor fuel spillage.
  6. Lubricate O-Rings: Apply a small amount of clean engine oil to the new O-rings on the replacement injector.
  7. Install New Injector: Press the new injector firmly into the fuel rail until it seats correctly.
  8. Secure Injector: Reinstall the retaining clip or bolts to secure the injector.
  9. Reconnect Lines: Re-attach the fuel line and plug in the electrical connector.
  10. Reconnect Battery: Reconnect the negative battery terminal.
  11. Check for Leaks: Prime the fuel system by turning the key to the "On" position a few times, then check thoroughly for any fuel leaks around the injector before starting the engine.

Troubleshooting & FAQ

Q: How do I know if this fuel injector fits my 496 engine?
A: This injector fits MerCruiser 8.1L/496 MAG and HO MPI models from 2004 and later. Verify your engine model against the "Compatible Engine Models" table and cross-reference your existing part number with the numbers listed, such as 881693002 or 3861278.

Q: What are the signs of a failing fuel injector?
A: Common symptoms include engine misfires, rough idling, poor acceleration, increased fuel consumption, or difficulty starting. A fuel smell may also be present if the injector is leaking.

Q: Are these injectors the same as the original Delphi parts?
A: These are aftermarket injectors built to meet or exceed OEM specifications. They feature the same Delphi Multec II electrical connection and 3-hole nozzle design for compatible performance.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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