80347M – Valve Seat – Mercury Marine

80347M Mercury Valve Seat regulates fuel flow within select Mercury Marine carburettor assemblies. It provides a precise sealing surface for the inlet needle.

This 80347M Mercury Valve Seat controls fuel entry into the carburettor bowl. Therefore, correct sealing prevents flooding and fuel overflow. When the valve seat wears or corrodes, fuel delivery becomes inconsistent. Consequently, you may notice rough idle, rich running, or fuel leakage.

Debris and ethanol fuel accelerate wear. Over time, the sealing surface develops pitting or scoring. As a result, the needle cannot seat properly. In severe cases, the engine may stall or flood during startup. Replacing a worn valve seat restores controlled fuel metering and smooth operation.

This part suits various Mercury Marine outboard carburettor systems.

This unit is Old Stock and remains unused in original packaging. It shows minor storage wear only.

Accurate fuel control protects engine performance. Therefore, replacing worn carburettor components prevents larger fuel system issues.

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