Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines (Replaces 803897Q1, 8M0046752)
Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines (Replaces 803897Q1, 8M0046752) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive...
Product Details
This Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines is engineered for MerCruiser 4-stroke sterndrive engines, including 2.5L, 3.0L, 3.7L, and 4.3L V6 models from the 1980s through the 2000s. It serves as an essential component for maintaining fuel system integrity and engine performance.
It is a direct interchange for MerCruiser parts 35-803897Q1 and 8M0046752, along with equivalents from Sierra, Mallory, and Volvo Penta.
- Installs inside the mechanical fuel pump's lower canister.
- Designed for gasoline-fueled sterndrive applications.
- Includes the filter element, spring, and required rubber gaskets for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 35-803897Q1 |
| MerCruiser | 8M0046752 / 35-8M0046752 |
| MerCruiser | 803897K1 / 803897Q1 |
| MerCruiser | 11004T1 / 11004T2 / 11004A1 / 11004Q2 / 11004 |
| Sierra | 18-7784 |
| Mallory | 9-37821 |
| Volvo Penta | 3855104 |
| GLM | 24850 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, this filter is typically used on engines with a mechanical fuel pump, identified by serial number ranges. Please verify your configuration.
For Volvo Penta applications, this part cross-references for models equipped with a mechanical fuel pump. Specific engine models are not listed; confirmation against OEM part number 3855104 is required.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 2.5L | 120 | 4-Stroke | 1980s–1990s (s/n 6229718 & Later) | 35-803897Q1 | Requires filter mounted in mechanical fuel pump |
| MerCruiser | 3.0L | 140/LX | 4-Stroke | 1980s–2000s (s/n 6229718 & Later) | 35-803897Q1 | Requires filter mounted in mechanical fuel pump |
| MerCruiser | 3.7L | 165, 170, 180, 190 CI | 4-Stroke | s/n 6916779 & Later | 35-803897Q1 | Requires filter mounted in mechanical fuel pump |
| MerCruiser | MC224 | - | 4-Stroke | s/n 6218037 & Later | 35-803897Q1 | All MC224 C.I. engines |
| MerCruiser | GM 262 C.I. (4.3L) | - | 4-Stroke | s/n 0A331455 & Later | 35-803897Q1 | Only models with Carter Fuel Pumps |
| MerCruiser | Alpha 1 | - | 4-Stroke | - | 35-803897Q1 | With compatible engine configurations |
| Volvo Penta | Compatible models | - | 4-Stroke | - | 3855104 | For models with mechanical fuel pump |
Technical Specs
- Product Type
- Mechanical Fuel Pump Filter Kit
- Installation
- Inside mechanical fuel pump lower canister (downward-facing cap)
- Fuel Type
- Gasoline
- Connection
- Internal filter in mechanical fuel pump
- Weight
- 0.06 kg (0.13 lb)
- Fitting Type
- Internal filter element
- Warranty
- 1 year (limited manufacturer warranty)
- Other Technical Attributes
- Complete kit includes filter element, spring, and rubber gaskets/rings
What’s in the Box
- 1 x Filter Element
- 1 x Spring
- 3 x Rubber Rings/Gaskets
Installation Notes
- Ensure the engine is cool and disconnect the battery. Relieve fuel system pressure according to your engine's service manual.
- Place a suitable container or absorbent rags below the mechanical fuel pump to catch any spilled fuel.
- Carefully unscrew the downward-facing canister cap from the bottom of the mechanical fuel pump.
- Remove the old filter, spring, and gaskets. Note their orientation.
- Clean the inside of the canister and the sealing surfaces.
- Install the new spring and filter element in the correct orientation.
- Replace the old rubber gaskets/rings with the new ones provided in the kit.
- Securely reinstall the canister cap. Do not overtighten.
- Reconnect the battery, prime the fuel system, and check for leaks before starting the engine.
Troubleshooting & FAQ
How do I know if this fuel filter kit will fit my engine?
The best way to confirm fitment is to match your engine's original part number to one listed in our Part Number Matrix. Additionally, check your engine model, year, and serial number against the Engine & Model Compatibility table. This filter is specifically for engines with a mechanical fuel pump that houses the filter in the lower canister.
What are the signs of a clogged or failing fuel filter?
Common symptoms include the engine sputtering or misfiring, difficulty starting, rough idling, loss of power during acceleration, or stalling. These issues occur because the restricted filter is starving the engine of fuel.
How often should this fuel filter be replaced?
As a best practice for marine engines, the fuel filter should be replaced at least once a year or every 100 hours of engine operation, whichever comes first. This interval helps prevent fuel delivery problems and protects sensitive engine components.
Is this kit complete for the installation?
Yes, this is a complete kit that includes the filter element, the internal support spring, and three assorted rubber rings/gaskets to ensure a proper seal upon installation.
What is the difference between this aftermarket filter and an OEM part?
This is an aftermarket replacement part, not an original OEM component. It has been engineered to meet or exceed OEM specifications for fit, form, and function, offering a high-quality, cost-effective alternative. It is manufactured in an ISO 9002 certified facility and undergoes quality control inspections.
What is your shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, with expedited options available at checkout where applicable.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, 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 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.
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