Mercury Quicksilver Under-Cowl Fuel Filter Kit 35-87946Q04 | 6–60HP Outboard

Name: Mercury Quicksilver Under-Cowl Fuel Filter Kit 35-87946Q04 | 6–60HP Outboard
Brand: MERC
SKU: 87946Q04
Price: 21.15 CAD
Availability: InStock

$21.15 - $21.15

$21.15

$21.15 - $21.15

$21.15

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Mercury Quicksilver Under-Cowl Fuel Filter Kit 35-87946Q04

Part Number: 87946Q04 | Also listed as: 35-87946Q04 / 35-87946K04
Brand: Mercury / Quicksilver
Official Product Type: Under-Cowl Fuel Filter Kit — Bowl-Style Element
Filtration Rating: 149 micron
System: Outboard Fuel Delivery
UPC / GTIN: 745061035522

A genuine OEM Mercury Quicksilver under-cowl fuel filter kit for applicable Mercury and Mariner outboards. This filter element installs inside the engine-mounted fuel filter bowl assembly and captures dirt, debris, and contamination before fuel reaches the carburetor, fuel pump, or injector system. Replacing this filter on schedule protects sensitive fuel-system components and helps maintain reliable starting and smooth running.

Compatible Applications

Mercury / Mariner 6 HP outboards — where specified by serial number and parts diagram
Mercury / Mariner 8 HP and 9.9 HP outboards — where specified
Mercury / Mariner 10 HP Marathon, Sea Pro, and Viking — where specified
Mercury / Mariner 15 HP, 15 Marathon, 15 Sea Pro, and Super 15 — where specified
Mercury / Mariner 20 HP and 20 Jet — where specified
Mercury / Mariner 25 HP, 25 Marathon, and 25 Sea Pro — where specified
Mercury / Mariner 30 HP — where specified
Mercury / Mariner 40 HP and 40 Jet — where specified
Mercury / Mariner 55 HP and 60 HP 3-cylinder — where specified
Select Suzuki outboards — confirm by OEM parts chart (cross-reference: Suzuki 15430-87D10)

Always confirm fitment by outboard serial number, horsepower, fuel filter bowl style, and the Mercury parts diagram before ordering. Mercury and Mariner outboards can use different under-cowl fuel filters depending on production range and fuel system configuration.

Part Details & Kit Contents

Filter type: Under-cowl bowl-style element (not an inline barb filter or remote fuel-water separator)
Filtration rating: 149 micron
Kit includes: Replacement filter element and sealing components as supplied in the factory kit
Diagram position: Engine-mounted fuel filter bowl assembly — confirm location in the Mercury fuel-system diagram for your outboard

Cross-Reference Part Numbers

Mercury / Quicksilver OEM: 35-87946Q04 / 87946Q04
Related Mercury format: 35-87946K04 — verify by application
Sierra aftermarket: 18-7802 — verify by fuel-system diagram
Suzuki cross-reference: 15430-87D10 — verify by engine model and parts chart

Service Interval

Replace annually or at every 100-hour service, whichever comes first. Also replace sooner if the engine shows hard starting, poor idle, hesitation, lean running, or fuel starvation — or after stale fuel, ethanol-related debris, tank contamination, or water intrusion in the fuel system.

Installation Notes

Shut off the fuel supply before servicing the filter bowl.
Remove the bowl carefully and discard the old filter element.
Clean the bowl if contamination is present before installing the new element.
Replace the supplied gasket or seal — do not reuse swollen, cracked, or fuel-damaged seals.
After reassembly, prime the fuel system, inspect for leaks, and run the engine to confirm stable operation.

Technical FAQ

Q: How do I know if my outboard uses this filter style?
A: Look under the cowling for a small bowl-style fuel filter assembly mounted on the engine. If your outboard uses an inline barb filter or a remote fuel-water separator instead, a different service part is required. Confirm by serial number and the Mercury fuel-system diagram.

Q: Can I use an aftermarket filter instead of OEM?
A: Sierra 18-7802 is a commonly listed aftermarket cross-reference. However, always verify the cross-reference against your specific outboard’s serial number and fuel-system diagram before substituting.

Parts Desk Insights

Best use case: This is the right filter for Mercury and Mariner outboards in the 6–60 HP range that use the bowl-style under-cowl fuel filter assembly. It is most commonly ordered as part of an annual service kit alongside spark plugs and gear oil. The 149-micron rating makes it a pre-filter — it catches larger debris before fuel reaches the more sensitive downstream components.

Common issues: The most frequent issue is customers ordering this filter for an outboard that uses an inline barb-style filter instead of a bowl-style element — the two are not interchangeable. Always confirm the filter housing style under the cowl before ordering. A second common issue is skipping the bowl gasket or seal during replacement, which leads to a fuel leak at the bowl joint after reassembly.

Related Parts

Shipping information

In-stock and OEM parts: ship same or next business day.

Locally warehoused items: ship within 1-3 business days.

Special-order items: timeline confirmed after order.

Returns & warranty

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