Inline Fuel Filter – Fits Mercury Marine 25-90 HP 4-Stroke (Replaces 35-877565T, 35-877565T1)
Inline Fuel Filter – Fits Mercury Marine 25-90 HP 4-Stroke (Replaces 35-877565T, 35-877565T1) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Inline Fuel Filter – Fits Mercury Marine 25-90 HP 4-Stroke (Replace...
Product Details
This Inline Fuel Filter is engineered for Mercury Marine 25-90 HP 4-Stroke outboards manufactured between 1999 and 2006. It protects the engine's fuel system by filtering out contaminants before they can reach the carburetor or injectors, ensuring reliable performance.
This filter is a direct replacement for Mercury part numbers 35-877565T and 35-877565T1, and it also interchanges with Sierra 18-7714.
- Installs under the cowl, inline with the existing fuel line.
- Features a translucent plastic housing for easy visual inspection of fuel and debris.
- Designed for use with gasoline fuel systems.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury Marine | 35-877565T | 35-877565T1 | Original OEM part number. |
| Mercury Marine | 35-877565T1 | Current OEM part number. | |
| Sierra | 18-7714 | Aftermarket cross-reference. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for specific Mercury Marine 4-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 4-Stroke | 25 | 4-Stroke | 1999–2006 | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke | 30 | 4-Stroke | 1999–2006 | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke (3 Cylinder) | 40 | 4-Stroke | 1999-Up | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke (4 Cylinder) | 40 | 4-Stroke | 2001–2002 | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke (4 Cylinder) | 50 | 4-Stroke | 2001–2002 | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke (4 Cylinder) | 60 | 4-Stroke | 2001–2002 | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke | 75 | 4-Stroke | 2000–2003 | 35-877565T1 | Supersedes 35-877565T |
| Mercury | 4-Stroke | 90 | 4-Stroke | 2000–2003 | 35-877565T1 | Supersedes 35-877565T |
Technical Specs
- Product Type
- Inline Fuel Filter
- Installation
- Under cowl, inline to fuel line
- Fuel Type
- Gasoline
- Connection
- Inline with existing hose clamps
- Housing Material
- Translucent plastic
- Housing Color
- Clear
- Dimensions
- 10.5" H x 5.0" W x 6.0" L
- Weight
- 1 gram (0.035 oz)
- Fitting Type
- Inline fuel line
- Key Feature
- Allows visual inspection of fuel content and debris
- Warranty
- Amazon 30-day return only for retail purchase
What’s in the Box
- 1 x Fuel Filter (35-877565T1)
Installation Notes
- Ensure the engine is off and the fuel supply is shut off. Place a rag or container under the old filter to catch any spilled fuel.
- Locate the existing fuel filter under the engine cowl. Note the direction of the fuel flow arrow on the old filter.
- Loosen the hose clamps on both sides of the filter and carefully remove the fuel lines from the filter.
- Install the new filter, making sure the flow arrow points in the correct direction (towards the engine).
- Secure the fuel lines onto the new filter with the hose clamps and tighten them securely.
- Turn the fuel supply back on, prime the engine if necessary, and check for any leaks before starting.
Troubleshooting & FAQ
How do I know if this filter fits my engine?
This filter is designed for specific Mercury Marine 4-Stroke outboards from 25-90 HP (1999–2006). Please consult the "Engine & Model Compatibility" table and verify your engine's model, horsepower, and year range before purchasing.
How often should this fuel filter be replaced?
As a best practice, the inline fuel filter should be inspected regularly and replaced annually or every 100 hours of operation, whichever comes first. Replacement may be needed sooner if you experience fuel contamination or operate in harsh environments.
What are the signs of a clogged or failing fuel filter?
Common symptoms include engine hesitation, loss of power, stalling, difficulty starting, or a rough idle. The translucent housing on this filter also allows you to visually inspect for debris, water, or other contaminants, indicating a replacement is needed.
Can I install this filter myself?
Yes, installation is straightforward for those with basic mechanical skills. It involves locating the old filter under the cowl, releasing the clamps, and replacing it inline. However, always work in a well-ventilated area and take precautions against fuel spillage. If you are not confident, professional installation is recommended.
What is the benefit of the clear housing?
The clear, translucent plastic housing allows for immediate visual inspection of your fuel. You can easily spot water, sediment, or other debris that has been captured by the filter, providing an early warning of fuel system contamination before it causes engine problems.
The listed weight of 1 gram seems incorrect. What is the actual weight?
The weight of 1 gram noted in the source data is likely a typographical error. The actual weight is minimal but more than 1 gram, comparable to similar plastic inline filters. The product dimensions are 10.5" H x 5.0" W x 6.0" L.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in 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.
Payment & Security
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