Sierra 18-0462 Carburetor Mounting Gasket for Universal Q-jet Carburetors

The Sierra 18-0462 is a carburetor mounting gasket engineered to seal the base of a Universal Q-jet carburetor with electric choke to the intake manifold. It is built to meet or exceed the quality of the original equipment part it replaces, giving boaters a reliable, drop-in seal for carburetor servicing or replacement work. This gasket is the designated replacement gasket for the remanufactured Universal Q-jet carburetor with electric choke, and it is commonly paired with carburetor rebuild work on that same unit.

Using the correct mounting gasket is critical to preventing vacuum leaks, fuel leaks, and rough idle or stalling caused by a poor seal between the carburetor base and the intake manifold. The Sierra 18-0462 is manufactured to precise dimensions so it seats correctly without the trimming or fitting issues sometimes seen with generic gaskets. It cross-references directly to GLM 31540, Mallory 9-61003, and Mercruiser 27-48399, making it a straightforward replacement for boaters who already have one of those part numbers specified for their engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0462
• Product Type: Carburetor Mounting Gasket
• Weight: 0.09 pounds
• Package Quantity: 1
• OEM Cross Reference: GLM 31540, Mallory 9-61003, Mercruiser 27-48399
• Compatible Carburetor: Universal Q-jet Carburetor with Electric Choke (Remanufactured)

Fitment

Designed for use with the Universal Q-jet carburetor with electric choke (remanufactured). It is the specified replacement gasket for this carburetor and is also used as a mounting gasket for equivalent carburetors cross-referenced below.

Replaces (OEM)

• GLM 31540
• Mallory 9-61003
• Mercruiser 27-48399

Frequently Asked Questions

What is the Sierra 18-0462 gasket used for? It is a carburetor mounting gasket that seals the base of a Universal Q-jet carburetor with electric choke to the intake manifold, preventing vacuum and fuel leaks at that joint.

Is the Sierra 18-0462 the same as GLM 31540? Yes, the Sierra 18-0462 carburetor mounting gasket is interchangeable with GLM 31540, so either part number will fit the same application.

Does the Sierra 18-0462 replace Mercruiser 27-48399? Yes. The Sierra 18-0462 gasket is a direct cross-reference for Mercruiser 27-48399 and can be used in its place.

Is 18-0462 also equivalent to Mallory 9-61003? Yes, Mallory 9-61003 cross-references to the Sierra 18-0462 carburetor mounting gasket, so it is interchangeable with that number as well.

How much does the 18-0462 gasket weigh? The Sierra 18-0462 carburetor mounting gasket weighs 0.09 pounds.

Which carburetor does the 18-0462 gasket fit? The 18-0462 is the specified replacement gasket for the Universal Q-jet carburetor with electric choke.

How many gaskets come in one order of 18-0462? One Sierra 18-0462 carburetor mounting gasket is included per unit.

Is the Sierra 18-0462 an OEM or aftermarket gasket? The Sierra 18-0462 is manufactured to meet or exceed the quality of the original equipment gasket it replaces, making it a reliable aftermarket equivalent to the OEM part.

Do I need a carb kit along with the 18-0462 gasket? The 18-0462 is the mounting gasket only; if a full carburetor rebuild is being performed on the Universal Q-jet with electric choke, a separate carburetor kit would be needed in addition to this gasket.

Will the 18-0462 gasket stop a rough idle caused by a carburetor base leak? A worn or damaged carburetor mounting gasket is a common cause of vacuum leaks that lead to rough idle, and replacing it with the Sierra 18-0462 restores the seal between the carburetor and intake manifold.

Can I reuse the old carburetor mounting gasket instead of buying the 18-0462? Mounting gaskets compress and can lose their seal once removed, so it is recommended to install a new Sierra 18-0462 gasket any time the carburetor is taken off rather than reusing the old one.