Mercury Mariner Outboard Fuel Pump Check Valve Kit 13424A1
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The Mercury MerCruiser Quicksilver Check Valve Kit 13424A1 is a genuine Mercury fuel-pump check valve service part used on select Mercury / Mariner outboard fuel pump assemblies. It is used in the fuel pump and fuel line system to help maintain correct one-way fuel flow through the pump during engine operation. Mercury parts references list this part as 21-13424A1 Check Valve Assembly, with the later replacement reference 8M0084275.
Key Features
- Genuine Mercury / Quicksilver fuel system service part
- Part number: 13424A1
- Also referenced as 21-13424A1
- Component description: Check Valve Assembly / Check Valve Kit
- Used in select Mercury / Mariner outboard fuel pump assemblies
- Helps maintain one-way fuel flow through the fuel pump circuit
- Original 21-13424A1 reference superseded to 8M0084275
- Approximate shipping specs listed for 21-13424A1: 0.06 lb, 4.25" L x 2.75" W x 0.78" H
Engine Compatibility
Commonly referenced for select legacy Mercury / Mariner 2-stroke outboards, including:
- 35 HP 2-cylinder applications
- 50 HP 3-cylinder applications
- 60 HP 3-cylinder applications
Related Mercury cross-reference and 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 exact parts diagram.
Serial Number Fitment Notice
Fuel pump check valve fitment can vary 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 This Part Needs Replacement
Replace this check valve kit when the fuel pump is being serviced, or when the check valve is damaged, stuck, leaking, contaminated, or no longer maintaining proper fuel flow direction. Common fuel-system symptoms can include hard starting, poor fuel delivery, hesitation, or inconsistent running when the fuel pump assembly is no longer sealing or operating correctly.
Installation Notes
Install according to the Mercury service manual for the specific engine and fuel pump assembly. During service, inspect the fuel pump diaphragm, gaskets, retainer, screws, spring, fuel lines, and sealing surfaces. Fuel system parts must be clean, correctly seated, and leak-free before the engine is returned 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Alternate/Superseded Part Numbers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
Parts Desk Insight
This is a small fuel-pump service part, but the match is very specific. The best check is the fuel pump diagram and engine serial number, because similar Mercury / Mariner fuel pump assemblies can use different check valve, retainer, gasket, and diaphragm combinations.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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