Mercury Quicksilver Check Valve Kit 13424A1 (Supersedes 8M0084275)
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Mercury Quicksilver Check Valve Kit 13424A1
Keep your outboard's fuel pump working reliably with this genuine Quicksilver check valve kit. Designed to maintain correct one-way fuel flow through the fuel pump circuit, this small but critical component is the right fix when your fuel pump is being serviced or when the existing valve is damaged, stuck, leaking, or contaminated.
Originally catalogued as 21-13424A1, this part has been superseded by 8M0084275 — both references are valid for ordering and fitment lookup.
Key Features
- Genuine Quicksilver fuel system service part
- Part number: 13424A1 / 21-13424A1
- Superseded by: 8M0084275
- Maintains one-way fuel flow through the pump circuit
- Fits select Mercury / Mariner 2-stroke outboards (see compatibility below)
Engine Compatibility
Commonly used on select legacy Mercury / Mariner 2-stroke outboards, including:
- 35 HP – 2-cylinder applications
- 50 HP – 3-cylinder applications
- 60 HP – 3-cylinder applications
Related catalog references also associate this check valve family with select 40 / 402 and 70 / 700 Mercury / Mariner fuel pump applications, depending on serial range and parts diagram.
Fitment Notice
Fuel pump check valve fitment varies by horsepower, cylinder count, fuel pump assembly, production range, and engine serial number. Always confirm 13424A1 / 21-13424A1 against your engine serial number, original fuel pump diagram, or Mercury parts catalog before ordering.
When to Replace
Replace this check valve kit when servicing the fuel pump, or when the valve is damaged, stuck, leaking, contaminated, or no longer holding proper fuel flow direction. Common symptoms include hard starting, poor fuel delivery, hesitation, or inconsistent running.
Installation Notes
Install per the Mercury service manual for your specific engine and fuel pump assembly. During service, inspect the diaphragm, gaskets, retainer, screws, spring, fuel lines, and sealing surfaces. All fuel system components must be clean, correctly seated, and leak-free before returning the engine to service.
Alternate & Superseded Part Numbers
- Mercury / Quicksilver: 13424A1
- Mercury prefix reference: 21-13424A1
- Superseded / replacement reference: 8M0084275
- Related Mercury references: 92346A3, 30430A9
- Related aftermarket reference: GLM40170
Related Products
- Mercury Fuel Pump Diaphragm 89031A3 – Diaphragm kit for compatible fuel pump assemblies
- Mercury MerCruiser Quicksilver Fuel Filter 802893Q01 – Inline fuel filter for Mercury / MerCruiser applications
- Mercury Outboard Under-Cowl Fuel Filter Kit 35-87946Q04 – Under-cowl fuel filter kit for Mercury outboards
- Sierra Marine Fuel Pump 18-7278 – Aftermarket fuel pump for Mercury / Mariner 4–15 HP 2-stroke engines
Parts Desk Insights
Best use case: This kit is the correct service part when rebuilding or replacing the fuel pump on a legacy Mercury / Mariner 2-stroke outboard and the check valve is the failed or worn component. It is not a full pump rebuild kit — if the diaphragm or gaskets are also worn, order those separately. The most reliable fitment check is the fuel pump parts diagram matched to your engine serial number, since similar Mercury / Mariner pump assemblies can use different check valve, retainer, gasket, and diaphragm combinations across serial ranges.
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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Important:
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