Volvo Penta 3847644 Fuel Filter / Water Separator 6 Micron

Volvo Penta 3847644 Spin-On Fuel Filter / Water Separator (6 Micron)

What This Part Does

The 3847644 is a high-capacity spin-on fuel filter and water separator that removes water, dirt, and fine contaminants from the fuel supply before they reach the engine. At 6-micron filtration, it provides finer protection than the standard 3862228 it replaces, and is physically taller while sharing the same thread and seal profile.

Compatible Applications

• Volvo Penta 4.3GXi-J / JF
• Volvo Penta 4.3OSi-J / JF
• Volvo Penta V6-200 / V6-225
• Volvo Penta 5.7Gi300-J / JF
• Volvo Penta 5.7GXi-J / JF
• Volvo Penta 5.7OSi-J / JF
• Volvo Penta 5.7OSXi-J / JF
• Volvo Penta 8.1Gi-H / HF
• Volvo Penta 8.1GXi-G / GF
• Volvo Penta 8.1OSi-D / DF

Serial Number Fitment Notice: Volvo Penta specifies different fuel filters within closely related gasoline engine families. For example, some 4.3GL applications use 3862228 while 4.3GXi/OSi configurations use 3847644. Always confirm by engine model and serial number before ordering.

When to Replace

Replace this filter at the scheduled fuel-system service interval, or sooner if you notice any of the following:

• Difficult or slow starting
• Hesitation, rough running, or loss of power
• Restricted fuel flow or poor high-rpm performance
• Water or contamination found in the fuel system

Service Interval

Follow your engine’s maintenance schedule. Volvo Penta typically recommends fuel filter replacement annually or every 100 operating hours, whichever comes first. More frequent replacement is advisable in areas with poor fuel quality or where water contamination is a concern.

Installation Notes

• Shut off the fuel supply before removal
• Clean the filter-head sealing surface thoroughly
• Lightly lubricate the new filter gasket with clean, fuel-compatible lubricant
• Install hand-tight plus turn do not over-tighten
• Prime the fuel system as required before starting
• Check for leaks after startup before operating under load

Superseded Part Numbers

• Current: 3847644
• Replaces: 3862228
• Also supersedes: 3852413, 3851218

Technical FAQ

Q: Can I use 3862228 instead of 3847644?
A: Only if your engine specifically calls for 3862228. The 3847644 is the higher-capacity replacement and is taller on some engines there may be clearance considerations. Use the part number your engine’s serial range specifies.

Q: Does this filter fit both port and starboard filter heads on twin-engine installations?
A: Yes, where the engine model is the same on both sides and the application is confirmed.

Parts Desk Insights

Best Use Case: This is the correct high-capacity fuel filter for Volvo Penta GXi and OSi variants of the V6 and V8 gasoline family. It provides finer 6-micron filtration compared to the standard 3862228 and is the preferred choice for engines in that specification range.

Common Customer Issues: Customers sometimes order this filter for 4.3GL or other non-GXi/OSi variants those engines use a different filter. The part numbers look similar and the filters are physically close in size, which leads to mix-ups. Always match to the full engine model code and serial number, not just displacement.