FASWORX Raw Sea Water Pump for MerCruiser 4.3L-6.2L MPI V6/V8 with Pulley, EPDM Impeller & 316SS Wear Plates

FASWORX Raw Sea Water Pump with pulley is a heavy-duty, drop-in replacement designed to restore reliable raw-water cooling for MerCruiser 4.3L, 5.0L, 5.7L and 6.2L MPI V6/V8 engines.

If your MerCruiser outboard or sterndrive is running hot or the original plastic-backed pump has cracked, this OEM-plus aftermarket assembly is built to resist saltwater corrosion and deliver high-volume circulation. It ships fully assembled with a factory-pressed serpentine pulley and an EPDM impeller rated for elevated marine temperatures, so you avoid assembly and alignment headaches at installation.

How does this pump improve cooling compared to standard aftermarket pumps?

The FASWORX pump upgrades the common plastic-backed design with a corrosion-resistant housing and 316 stainless internal wear plates that reduce grooving and wear. A heavy-duty EPDM impeller sustains higher operating temperatures, maintaining steady flow when engines demand more coolant.

• 316 stainless steel internal wear plates for long-term durability
• Corrosion-resistant housing to fight saltwater damage
• EPDM impeller rated up to 105°C for sustained flow

Will this unit fit my MerCruiser engine and is installation straightforward?

This pump is a direct OEM-style replacement for specific MerCruiser and Quicksilver part numbers and is designed for Gen 7 inboard and sterndrive applications with a serpentine belt. It arrives pre-assembled and pre-lubricated, so most technicians can bolt it on as a drop-in swap without adaptor work.

• Directly replaces Mercury part numbers listed for easy matching
• Includes factory-pressed serpentine pulley for immediate fit
• Ships ready-to-install—no separate pulley or bearings to press in

Are there fitment limitations or engines this does not support?

Yes—this pump fits 4.3L, 5.0L, 5.7L (350 MAG), and 6.2L MPI engines equipped with the ECM 555 module and a serpentine belt, and it is for MANUAL DRAIN systems only. It lacks air fittings and will not work on 8.1L/496 models or 6.2L serials 2A456613+.

• Compatible with ECM 555-equipped 4.3L–6.2L MerCruiser engines
• Not compatible with 8.1L/496 or certain 6.2L serial numbers
• Designed for manual drain systems; no air fittings included

What materials and design choices extend this pump's service life?

FASWORX uses a heavy-duty housing and 316 stainless internal wear surfaces to resist cracking and saltwater erosion that shorten pump life in harsher marine environments. The EPDM impeller tolerates higher temperatures and preserves flow rate under load, while the assembled pulley reduces installation errors that can cause premature failure.

• 316 stainless wear plates reduce internal grooving and wear
• Corrosion-resistant external housing prevents structural cracking
• Pre-installed pulley minimizes installation stress and misalignment

Who is this for: Marine owners, repair shops, and technicians looking for a robust, ready-to-install raw water pump for MerCruiser Gen 7 inboard and sterndrive engines. Choose this pump if you need a corrosion-resistant replacement that matches OEM fitment, improves long-term reliability, and arrives pre-assembled with a serpentine pulley for fast service turnaround.

Note: confirm your engine serial number and system type before ordering to ensure compatibility; this pump is not universal and excludes certain models and drain/air configurations.