Sea Water Pump – Fits Volvo Penta 4.3GL-E/EF, 5.0GL-F/FF (Replaces 21255090, 3812520)
Sea Water Pump – Fits Volvo Penta 4.3GL-E/EF, 5.0GL-F/FF (Replaces 21255090, 3812520) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Sea Water Pump – Fits Volvo Penta 4.3GL-E/EF, 5.0GL-F/FF (Replaces ...
Product Details
This is an aftermarket Sea Water Pump – Fits Volvo Penta 4.3GL-E/EF, 5.0GL-F/FF (Replaces 21255090, 3812520) designed for Volvo Penta Gasoline V6 and V8 engines (4.3L–5.0L, 2-Stroke) from 2005 and newer. It is specifically built for models utilizing a dual V-belt configuration from the crankshaft.
It serves as a direct replacement for Volvo Penta part numbers 21255090 and 3812520, as well as aftermarket references from LSSOCH (21255090), TITAN 757 (3812520/21255090), and JMP Marine (JPR-VP5090G).
- Mounts directly to the crankshaft.
- Features a direct bolt-on design for straightforward installation.
- Equipped with a high-performance flexible impeller and a durable mechanical seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21255090 |
| Volvo Penta | 3812520 |
| LSSOCH | 21255090 |
| TITAN 757 | 3812520/21255090 |
| JMP Marine | JPR-VP5090G |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Volvo Penta engines, this pump is exclusively for models with a dual V-belt pulley configuration.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 4.3GL-E | 4.3L | 2-Stroke | 2005 and newer | 21255090, 3812520 | For engines with dual V-belt |
| Volvo Penta | 4.3GL-EF | 4.3L | 2-Stroke | 2005 and newer | 21255090, 3812520 | For engines with dual V-belt |
| Volvo Penta | 5.0GL-F | 5.0L | 2-Stroke | 2005 and newer | 21255090, 3812520 | For engines with dual V-belt |
| Volvo Penta | 5.0GL-FF | 5.0L | 2-Stroke | 2005 and newer | 21255090, 3812520 | For engines with dual V-belt |
Technical Specs
- Product Type
- Sea Water Pump (Raw Water Pump)
- Installation
- Crankshaft Mounted
- Fuel Type
- Gasoline
- Connection
- Hose Ports: 1-1/4" (31.75 mm)
- Housing Material
- Marine Grade Casting
- Housing Color
- Black or Red (varies by manufacturer)
- Dimensions
- 24.0 x 18.0 x 21.0 cm
- Weight
- 2.20–2.59 kg (4.85–5.7 lbs)
- Pulley Type
- V-Belt, 2 Groove
- Shaft Type
- Marine Grade (3X Series Non-Magnetic)
- Warranty
- Varies by manufacturer: 90 days to 1 year
- Other Technical Attributes
- Direct bolt-on, mechanical seal, high performance flexible impeller
What’s in the Box
- 1 x Sea Water Pump (Replaces 21255090, 3812520)
Installation Notes
- Disconnect the vessel's battery and close the seacock.
- Loosen the alternator and remove the two V-belts from the pump pulley.
- Disconnect the raw water inlet and outlet hoses from the pump. Prepare for some water spillage.
- Remove the mounting bolts that secure the pump to the engine crankshaft.
- Carefully pull the old pump off the crankshaft.
- Clean the engine mounting surface and the crankshaft snout to ensure a clean seal.
- Align the new pump and slide it onto the crankshaft.
- Secure the pump with its mounting bolts, tightening them to the manufacturer's specified torque.
- Reconnect the water hoses and tighten the hose clamps securely.
- Reinstall the V-belts and adjust for proper tension as per your engine manual.
- Reopen the seacock and reconnect the battery.
- Start the engine and immediately check for any water leaks around the pump and hoses.
Troubleshooting & FAQ
How do I know if this pump fits my engine?
This pump fits specific Volvo Penta 4.3L and 5.0L gasoline engines from 2005 onward. The most critical requirement is that your engine must have a dual V-belt pulley system. Please verify your engine model against the compatibility table.
What are the signs of a failing sea water pump?
Common symptoms include engine overheating at idle or low speeds, visible water leaks from the pump housing or weep holes, a wobbly or noisy pulley, or reduced water flow from the exhaust.
Why are some pumps black and others red?
The color of the housing varies by the manufacturer. OEM pumps are typically black, while some aftermarket or rebuilt units may be painted red or black. The color has no impact on the pump’s function or fitment.
How often should the impeller be replaced?
As a general maintenance rule, the flexible impeller inside the pump should be inspected annually and replaced every 1-2 years, or as recommended in your engine's service manual, even if it appears to be in good condition.
Does this pump include gaskets or mounting hardware?
The package contains the sea water pump assembly. While it may include some hardware, we recommend having a new gasket or o-ring kit on hand for installation, as these are critical for a leak-free seal and are not always included.
Is this a difficult part to install?
For those with mechanical experience and the correct tools, replacement is straightforward. However, due to its critical role in engine cooling and the need for correct belt tensioning, professional installation is recommended to ensure safety and optimal performance.
What is the difference between OEM and aftermarket parts?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is engineered to meet or exceed OEM-level specifications using comparable high-quality materials. Our parts are produced in an ISO 9002 certified facility and are batch-inspected to ensure consistent quality and performance.
How fast do you ship and what does it cost?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and their costs will be displayed at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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