Volvo Penta Fuel Filter 21718912 | OEM D4/D6 Diesel Water-Separating Filter

Volvo Penta OEM Fuel Filter — D4 / D6 Diesel Water-Separating Filter

Part Number: 21718912  |  SKU: 21718912
Brand: Volvo Penta  |  Product Type: Diesel Fuel Filter / Water-Separating Filter (Spin-On)
System: Fuel Delivery
Supersedes: 3583443
Replaced By (G-series engines, MY2020+): 23954708

The genuine Volvo Penta OEM spin-on fuel filter for D4 and D6 marine diesel engines (A–F generation, through model year 2019). This water-separating filter removes water, dirt, and fuel contaminants before they reach the high-pressure injection system — protecting injectors and fuel pumps from contamination damage. Features a threaded port for the EVC water-in-fuel sensor, maintaining full compatibility with Volvo Penta's electronic monitoring system.

Key Features

• Genuine Volvo Penta OEM fuel filter — factory fit and filtration specification
• Water-separating design removes water, dirt, and contaminants from diesel fuel
• Spin-on design for easy replacement during routine service
• Threaded port for EVC water-in-fuel sensor — sensor is reusable and must be transferred at service
• Correct filter for D4 and D6 A–F generation engines (through MY2019)
• Supersedes earlier Volvo Penta part number 3583443

⚠ Generation Fitment Notice — Read Before Ordering

This filter (21718912) fits D4/D6 A–F generation engines through model year 2019 only. Volvo Penta changed the fuel filter arrangement with the G-generation engines. If your engine is a MY2020 or newer D4 or D6, the correct fuel filter is 23954708 — not this part.

Always confirm your engine designation and serial number before ordering.

Compatible Applications

• Volvo Penta D4-180
• Volvo Penta D4-210
• Volvo Penta D4-225
• Volvo Penta D4-260
• Volvo Penta D4-300
• Volvo Penta D4-320 and related D4 A–F variants
• Volvo Penta D6-280
• Volvo Penta D6-300
• Volvo Penta D6-310
• Volvo Penta D6-330
• Volvo Penta D6-350
• Volvo Penta D6-370
• Volvo Penta D6-380
• Volvo Penta D6-400
• Volvo Penta D6-435 and related D6 A–F variants

Applies to D4/D6 A–F generation engines, model years through 2019. Confirm fitment using engine designation and serial number. G-generation (MY2020+) engines require a different filter.

Cross-Reference / Superseded Part Numbers

• Current Volvo Penta OEM: 21718912
• Previous Volvo Penta (superseded): 3583443
• Sierra equivalent: 18-8125
• Recmar reference: REC3583443
• UPC: 704715455390

Service Interval

Replace at every scheduled engine service — typically every 100 operating hours or annually, whichever comes first. Replace sooner if the water-in-fuel warning activates, fuel contamination is suspected, or you notice difficult starting or reduced power. Refer to your Volvo Penta engine operator's manual for the interval specific to your engine model and serial range.

Installation Notes

• Transfer the water-in-fuel sensor from the old filter to the new one before installation — the sensor is reusable
• Inspect the sensor O-ring and replace if worn
• Apply a thin film of clean diesel fuel to the filter gasket before installing
• Hand-tighten only — do not over-torque
• Prime and bleed the fuel system after installation per the applicable Volvo Penta service procedure
• Check for fuel leaks after the first start
• Dispose of used filter and collected water/fuel according to local environmental regulations

Technical FAQ

Q: Do I need to replace the water-in-fuel sensor when I change the filter?
A: No — the sensor is reusable. Remove it from the old filter and install it in the new one. Inspect the O-ring and replace if worn.

Q: My engine currently uses part 3583443. Is 21718912 the correct replacement?
A: Yes — 21718912 is the current Volvo Penta OEM part that supersedes 3583443.

Q: I have a MY2020 or newer D4/D6. Can I use this filter?
A: No — G-generation engines (MY2020+) require a different fuel filter (23954708). Confirm your engine generation before ordering.

Q: My EVC is showing a water-in-fuel warning. What should I do?
A: Replace this filter and drain any accumulated water from the filter housing. If the warning persists after replacement, inspect the fuel tank and supply lines for contamination.

Q: How do I prime the fuel system after replacing the filter?
A: Use the manual priming pump (if equipped) or follow the bleeding procedure in your Volvo Penta service manual for your specific engine variant.

Related Parts

• Volvo Penta Water-in-Fuel Sensor 3808616 — D3 / D4 / D6 Diesel
• Volvo Penta Air Filter Insert 21702999 — D4 / D6 / D9 / D11
• Volvo Penta Oil Filter 21707132
• Browse Volvo Penta Fuel System Parts
• Browse Volvo Penta Engine Maintenance Parts

Parts Desk Insights

Best Use Case: Standard annual maintenance item for Volvo Penta D4 and D6 diesel owners. Most commonly ordered as part of a 100-hour or seasonal service alongside an oil filter and air filter. The water-separating function is especially valuable for vessels that sit between uses or operate in areas with variable fuel quality — water in diesel is one of the leading causes of injector damage on these engines.

Common Issues: The most frequent mistake is ordering this filter for G-generation (MY2020+) D4/D6 engines — double-check the engine generation before ordering. Customers also commonly forget to transfer the water-in-fuel sensor from the old filter; the sensor is not included and must be reused. If an EVC water-in-fuel alarm is active, replace the filter, drain accumulated water, and inspect upstream fuel supply before clearing the alarm.