Fuel Filter – Fits MerCruiser 2.5L, 3.0L, 3.7L Engines (Replaces 35-8M0046752, 35-803897Q1)
Fuel Filter – Fits MerCruiser 2.5L, 3.0L, 3.7L Engines (Replaces 35-8M0046752, 35-803897Q1) 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
Fuel Filter – Fits MerCruiser 2.5L, 3.0L, 3.7L Engines (Replaces 35...
Product Details
This Fuel Filter – Fits MerCruiser 2.5L, 3.0L, 3.7L Engines is designed for a precise fit on a range of Mercury MerCruiser inline 4-cylinder and 6-cylinder engines with mechanical fuel pumps, covering models from 1983 through 1998. It serves as a vital component for maintaining fuel system health and engine performance by filtering out harmful contaminants.
It is a direct interchange for MerCruiser part numbers 35-8M0046752, 35-803897Q1, 35-11004A1, and 35-11004Q2, as well as aftermarket equivalents from Sierra (18-7784) and Mallory (9-37821).
- Installs internally within the mechanical fuel pump canister.
- Features a 20-micron filtration rating to protect sensitive engine components.
- Kit includes the filter element, gaskets, and spring for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 35-8M0046752 |
| MerCruiser | 35-803897Q1 |
| MerCruiser | 35-11004A1 |
| MerCruiser | 35-11004Q2 |
| MerCruiser | 35-803897 |
| MerCruiser | 35-11004 |
| Sierra | 18-7784 |
| Mallory | 9-37821 |
| Volvo Penta | (equivalent) |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser stern drive engines, this filter fits various models from the early 1980s through the late 1990s that utilize a mechanical fuel pump. Please verify your specific model and year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| MerCruiser | 120 | 120 | 4-Stroke | 1983–1986 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 140 | 140 | 4-Stroke | 1983–1986 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 165 | 165 | 4-Stroke | 1987 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 170 | 170 | 4-Stroke | 1985–1986 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 175 | 175 | 4-Stroke | 1987 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 180 | 180 | 4-Stroke | 1987 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 185 | 185 | 4-Stroke | 1983–1986 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 190 | 190 | 4-Stroke | 1985–1986 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 205 | 205 | 4-Stroke | 1985–1987 | 35-803897Q1/35-8M0046752 |
| MerCruiser | 470 | 4-Stroke | 1983–1984 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 488 | 4-Stroke | 1983–1984 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 2.5L | 4-Stroke | 1987 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 2.5L [ALPHA] | 4-Stroke | 1988–1989 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.0L | 4-Stroke | 1987 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.0L [ALPHA] | 4-Stroke | 1988–1991, 1993–1994, 1998 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.0L [ALPHA I] | 4-Stroke | 1987, 1990–1992 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.0LX [ALPHA] | 4-Stroke | 1990–1991, 1993–1997 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.0LX [ALPHA I] | 4-Stroke | 1990–1992, 1994–1995 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.7L [ALPHA] | 4-Stroke | 1988–1989 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 3.7LX [ALPHA] | 4-Stroke | 1988 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 4.3L | 4-Stroke | 1990 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 4.3L [ALPHA] | 4-Stroke | 1988–1991 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 4.3L [ALPHA I] | 4-Stroke | 1991–1992 | 35-803897Q1/35-8M0046752 | |
| MerCruiser | 4.3LX [ALPHA I] | 4-Stroke | 1991–1992 | 35-803897Q1/35-8M0046752 |
Technical Specs
- Product Type
- Fuel Filter Element with Gaskets
- Installation
- Internal, within mechanical fuel pump canister
- Filtration Rating
- 20 microns
- Fuel Type
- Gasoline
- Connection
- Internal pump mount
- Housing Material
- Stainless Steel
- Housing Color
- Silver/Metal
- Product Dimensions
- 14.0" L x 12.0" W x 4.0" H
- Weight
- 20 g (0.705 oz)
- Fitting Type
- Internal
- Warranty
- Amazon 30-day return guarantee
- Other Attributes
- Located within the lower canister of the mechanical fuel pump
What’s in the Box
- 1 x Fuel Filter Element (35-8M0046752/35-803897Q1)
- 1 x Gasket (included)
- 1 x Pressure Spring (included)
- 2 x O-gaskets (included)
Installation Notes
- Disconnect the boat's battery before starting work.
- Carefully relieve any pressure in the fuel system.
- Place absorbent rags under the mechanical fuel pump to catch any spilled fuel.
- Unscrew and remove the lower fuel pump canister that houses the filter.
- Take out the old filter, spring, and any existing gaskets. Note their orientation.
- Clean the inside of the canister and the sealing surfaces on the pump body.
- Place the new spring and filter element inside the canister.
- Install the new gaskets as required, ensuring a proper seal.
- Screw the canister back onto the fuel pump and tighten securely. Do not overtighten.
- Reconnect the battery.
- Prime the fuel system according to your engine's manual and carefully check for any leaks around the canister before starting the engine.
Troubleshooting & FAQ
How do I confirm this filter fits my engine?
The best method is to match your existing part number to one listed in our Part Number Matrix. If you cannot find a part number, use the Engine & Model Compatibility table to check your specific MerCruiser model and year range. This filter is only for specific engines with mechanical fuel pumps.
What are the signs of a clogged fuel filter?
Common symptoms include engine hesitation, sputtering, loss of power (especially under load), difficulty starting, or stalling. These issues occur because the restricted fuel flow starves the engine of gasoline.
How often should this fuel filter be replaced?
For preventative maintenance, it is recommended to replace your fuel filter annually or every 100 hours of operation, whichever comes first. Frequency may increase if you experience fuel contamination issues.
Where is this filter located on the engine?
This filter element is located inside the lower canister of the engine-mounted mechanical fuel pump. You must unscrew the canister (a round metal cup) from the bottom of the pump to access it.
Is the included pressure spring necessary?
Yes, the spring is critical. It holds the filter element securely in place against the fuel pump body, ensuring that fuel flows through the filter media and not around it. Always replace the spring if the old one is weak, corroded, or missing.
What is the difference between this filter and an OEM one?
While this is an aftermarket part, it is designed to meet or exceed OEM specifications for fit, filtration, and durability. The primary difference is the price, offering a cost-effective solution without compromising on quality.
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.
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