Sierra 18-0434 Carburetor Mounting Gasket - Replaces GLM 31740, OMC/Evinrude-Johnson 909758

The Sierra 18-0434 is a carburetor mounting gasket used to seal the connection between the carburetor and the intake manifold, preventing air and fuel leaks at this joint. It is designed as a direct replacement gasket for the Rochester 7044185 carburetor and is used as part of the Sierra 18-7075 replacement carburetor kit. This gasket meets or exceeds the quality of the original equipment part it replaces, giving installers a reliable seal without sourcing a full carburetor rebuild kit just to replace a worn or damaged gasket.

Because carburetor gaskets harden and lose their seal over time from heat cycling and exposure to fuel, replacing the mounting gasket is a routine step during carburetor service, rebuilds, or when troubleshooting a vacuum or fuel leak at the carburetor base. The 18-0434 is sold individually, making it a straightforward, low-cost fix when only the mounting gasket needs to be renewed. It carries the Sierra part number 18-0434 for easy reordering and cross-references directly to several original equipment part numbers used across outboard and marine engine applications.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0434
• Item Type: Carb Mounting Gasket
• Shape: Mount
• UPC: 030999873996
• Unit Count: 1
• Weight: 0.08 pounds
• Related Carburetor Kit: 18-7075 (for Rochester 7044185 carburetor)

Fitment

• Rochester 7044185 carburetor

Replaces (OEM)

• GLM 31740
• Evinrude/Johnson 909758
• OMC 909758

Frequently Asked Questions

What is the Sierra 18-0434 used for? It is a carburetor mounting gasket that seals the joint between the carburetor and the intake manifold, sealing out air and fuel leaks at that connection.

Does the 18-0434 gasket cross-reference to any OEM numbers? Yes, the Sierra 18-0434 is interchangeable with GLM 31740, Evinrude/Johnson 909758, and OMC 909758.

Is the OMC 909758 the same gasket as the Evinrude/Johnson 909758? Yes, 909758 is listed as both an OMC and an Evinrude/Johnson number, and the Sierra 18-0434 cross-references to it under both listings.

Which carburetor does this gasket fit? The 18-0434 mounting gasket is used with the Rochester 7044185 carburetor and is included in the Sierra 18-7075 replacement carburetor kit.

How much does the 18-0434 gasket weigh? The Sierra 18-0434 carburetor mounting gasket weighs 0.08 pounds.

How many gaskets come in a package? The Sierra 18-0434 is sold as a single gasket, with a unit count of 1.

Is this a genuine Sierra part or a generic aftermarket copy? The 18-0434 is a genuine Sierra part, manufactured to meet or exceed the quality of the original equipment gasket it replaces.

Do I need the full 18-7075 carburetor kit, or can I just buy the gasket? The mounting gasket is available on its own as the Sierra 18-0434, so you do not need to purchase the full 18-7075 carburetor kit if only the mounting gasket needs replacing.

When should I replace this carburetor mounting gasket? Replace the 18-0434 gasket when it hardens, cracks, or no longer seals properly, which commonly shows up as a fuel or vacuum leak at the base of the carburetor.

What is the UPC for the Sierra 18-0434 gasket? The UPC for the Sierra 18-0434 carburetor mounting gasket is 030999873996.