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Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines (Replaces 803897Q1, 8M0046752)
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Fuel Filter Kit – Fits MerCruiser 2.5L, 3.0L, 3.7L, 4.3L Sterndrive Engines
This fuel filter kit is designed for a wide range of MerCruiser 4-stroke sterndrive engines, including 2.5L (120 HP), 3.0L (140 HP), 3.7L (165-190 HP), and 4.3L (V6) models manufactured from the 1980s through the 2000s. It serves as a direct-fit replacement for the filter located inside the mechanical fuel pump.
It directly replaces OEM part numbers including MerCruiser 35-803897Q1, 8M0046752, 35-8M0046752, 803897K1, Sierra 18-7784, Mallory 9-37821, and Volvo Penta 3855104, ensuring compatibility and reliable performance.
- Complete Service Kit: Includes the filter element, a new spring, and multiple rubber gaskets to ensure a leak-free seal.
- Installation Location: Designed for installation inside the mechanical fuel pump's lower canister.
- Fuel Compatibility: Engineered for use with gasoline fuel systems.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| 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 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
Confirm your engine model/year in the table below.
| 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 Specifications
| Specification | Value |
|---|---|
| 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 |
Package Contents
- 1 x Filter Element
- 1 x Spring
- 3 x Rubber Rings/Gaskets
Installation Guide
- Ensure the engine is off and cool, and disconnect the battery for safety.
- Locate the mechanical fuel pump, typically mounted on the engine block.
- Place a rag or small container under the pump to catch any gasoline that may spill.
- Carefully unscrew the downward-facing cap or canister at the bottom of the fuel pump.
- Remove the old filter element, spring, and any existing rubber gaskets. Note their order and orientation.
- Wipe the inside of the pump canister clean of any debris or sediment.
- Select the correct new rubber gasket from the kit and place it on the canister or pump housing.
- Insert the new spring and filter element into the canister.
- Securely reinstall the canister, tightening it by hand until snug. Do not overtighten.
- Reconnect the battery.
- Prime the fuel system according to your engine's manual and carefully inspect for any leaks before starting the engine.
Troubleshooting & FAQ
Q: How do I confirm this filter fits my MerCruiser engine?
A: Check your engine's serial number. This kit is specified for 2.5L & 3.0L models with s/n 6229718 & later, 3.7L models with s/n 6916779 & later, and 4.3L GM engines with s/n 0A331455 & later that use a Carter-style mechanical fuel pump. Cross-referencing your old filter's part number with our list (e.g., 35-803897Q1) is the best way to guarantee fitment.
Q: Where is this filter located on the engine?
A: This filter element is not a standalone canister. It is designed to be installed inside the lower canister of the engine's mechanical fuel pump.
Q: What are the signs my fuel filter needs replacement?
A: Common symptoms of a clogged filter include engine hesitation, sputtering, loss of power (especially at high RPMs), difficulty starting, or stalling. A periodic visual inspection during maintenance can also reveal a dirty element.
Q: What is included in this kit?
A: The kit is a complete service package, containing the filter element, a new installation spring, and three assorted rubber rings/gaskets to ensure you have the correct seal for your specific fuel pump model.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
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Для наших типичных клиентов из США и Канады сроки доставки следующие:
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Основанная в 2002 году, компания JLM Marine зарекомендовала себя как специализированный производитель высококачественных морских деталей, базирующийся в Китае. Наша приверженность совершенству в производстве заслужила нам доверие ведущих мировых морских брендов.
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