Sierra 18-7373N Mercarb 2V Carburetor, Replaces Mercruiser 3310-864941A01, for 2002-2004 4.3L Engines

The Sierra 18-7373N is a new-casting, non-remanufactured Mercarb style 2-barrel (2V) carburetor built for Mercruiser stern drive applications. Unlike rebuilt cores, this unit is produced from new castings engineered to meet or exceed original equipment specifications, then flow-tested across the entire throttle range to confirm consistent performance. Fuel mixture and idle settings are pre-set at the factory, so only minor idle and choke adjustments are typically needed during installation, reducing setup time compared to a used or rebuilt core.

This carburetor is designed as a direct replacement for Mercruiser 3310-864941A01 and is intended for 2002-2004 4.3L engines within serial number range OM615000-OW300012. A gasket is included with the unit; if a replacement gasket is needed later, use Sierra part number 18-0994. For a full rebuild rather than a direct-replacement carburetor, Sierra also offers replacement carburetor kit 18-7098-1 for this application.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7373N
• Product Type: Mercarb style 2V carburetor
• Casting Type: New casting, non-remanufactured
• Gasket Included: Yes; replacement gasket is Sierra 18-0994
• Recommended Rebuild Kit: Sierra 18-7098-1
• Finish: Machined
• Fit Type: Universal fit
• Weight: 4.18 pounds
• UPC: 808282303891

Fitment

• Mercruiser 2002-2004 4.3L engines, serial number range OM615000-OW300012

Replaces (OEM)

• Mercruiser 3310-864941A01

Frequently Asked Questions

What does the Sierra 18-7373N carburetor replace? It is a direct replacement for Mercruiser part number 3310-864941A01.

Which engines is the 18-7373N carburetor designed for? It fits Mercruiser 2002-2004 4.3L engines within serial number range OM615000-OW300012.

Is this a new or remanufactured carburetor? The 18-7373N is a new casting, non-remanufactured carburetor, not a rebuilt core.

Does the 18-7373N come with a gasket? Yes, a gasket is included with the Sierra 18-7373N carburetor; the replacement gasket part number is Sierra 18-0994.

Will the carburetor need adjustment after installation? Fuel mixture and idle settings on the 18-7373N are pre-set at the factory, so typically only minor idle and choke adjustments are needed during installation.

Is there a rebuild kit alternative to buying the full 18-7373N carburetor? Yes, Sierra offers replacement carburetor kit 18-7098-1 for engines that use the 3310-864941A01 style carburetor.

How much does the 18-7373N carburetor weigh? The Sierra 18-7373N weighs 4.18 pounds.

What type of carburetor design is the 18-7373N? It is a Mercarb style 2-barrel (2V) carburetor.

What finish does the 18-7373N carburetor have? It has a machined finish.

How is the 18-7373N tested before it ships? Each 18-7373N carburetor is flow-tested throughout the entire throttle range to verify performance before it leaves the factory.

Is the 18-7373N carburetor calibrated for fuel efficiency? Yes, the 18-7373N is calibrated and engineered to help maximize fuel efficiency and performance in its 4.3L Mercruiser application.