Sierra 18-2802 Carburetor Flange Gasket, Replaces 27-48164 - Mercury Outboard, Pack of 2

The Sierra 18-2802 is a carburetor flange gasket engineered as a direct replacement for Mercury outboard engines. It seals the mating surface between the carburetor and the intake manifold flange, preventing air and fuel leaks that can cause rough idle, lean running conditions, or hard starting. Each package contains 2 gaskets, giving you a spare on hand for a future service or enough to cover a twin-carburetor setup in one order.

This gasket is sold under the Sierra part number 18-2802 and cross-references directly to the original Mercury numbers 27-48164 and 27-481641, so it can be ordered with confidence as a like-for-like replacement during carburetor removal, rebuild, or gasket-set service. At 0.04 pounds, it is a lightweight, thin-profile flange gasket sized to fit its intended carburetor mounting flange without modification.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2802
• Product Type: Carburetor Flange Gasket
• Package Quantity: 2 gaskets per package
• Replaces (OEM): 27-48164, 27-481641
• Weight: 0.04 pounds
• Application: Mercury outboard engines
• UPC: 808282258054

Fitment

Designed for Mercury outboard engines.

Replaces (OEM)

• 27-48164
• 27-481641

Frequently Asked Questions

What does the Sierra 18-2802 gasket fit? The Sierra 18-2802 carburetor flange gasket is designed for Mercury outboard engines, sealing the carburetor-to-intake-manifold flange joint.

What OEM numbers does part 18-2802 replace? Sierra 18-2802 replaces Mercury OEM numbers 27-48164 and 27-481641, so either original number can be used to confirm this is the correct gasket.

How many gaskets come in one package of 18-2802? Each package of the Sierra 18-2802 carburetor flange gasket contains 2 gaskets.

How much does the 18-2802 gasket weigh? The Sierra 18-2802 carburetor flange gasket weighs 0.04 pounds.

Is the Sierra 18-2802 a genuine Mercury part or an aftermarket replacement? The Sierra 18-2802 is a Sierra-branded replacement gasket manufactured to match the fit and function of Mercury OEM numbers 27-48164 and 27-481641, rather than a part sold under the Mercury brand itself.

When would I need to replace this carburetor flange gasket? This gasket, Sierra part 18-2802, should be replaced any time the carburetor is removed from a Mercury outboard for cleaning, rebuilding, or service, since the original gasket material can tear or lose its seal once disturbed.

What happens if this gasket fails or is left out during reassembly? A failed or missing 18-2802 flange gasket at the carburetor-to-manifold joint can allow air or fuel leaks, leading to a rough idle, lean-running condition, or hard starting on the affected Mercury outboard.

Does the 18-2802 package include enough gaskets for a twin-carburetor engine? Yes, the package of 2 gaskets included with Sierra 18-2802 is sized to cover a twin-carburetor application in a single order, or to leave a spare for a future service.

Can I order this part using the Mercury number instead of the Sierra number? Yes, since Sierra 18-2802 replaces Mercury numbers 27-48164 and 27-481641, either the Sierra or original Mercury number will point to the same gasket.

What is included when I order the 18-2802 gasket? An order of Sierra 18-2802 includes one package containing 2 carburetor flange gaskets; no other hardware or components are included.