Sierra Fuel Filter 18-7930, Replaces OMC 173326, for 1977-83 OMC Fuel Systems with Add-On Filter Kit

The Sierra 18-7930 is a fuel filter engineered as a direct replacement for OMC 173326, built for 1977-83 fuel systems equipped with an add-on filter kit. It is designed to trap contaminants, debris, and water from entering the fuel system, helping protect the carburetor and fuel delivery components from the damage that dirty or moisture-laden fuel can cause. The filter measures 5/16 inch, or 79 millimeters, in diameter and carries a 20 micron filtration rating, sizing it to capture fine particulate while maintaining adequate fuel flow to the engine.

Sierra manufactures this filter as a like-for-like fit for boat owners running older OMC fuel systems that were originally set up with an add-on filter kit, making it a straightforward swap during routine maintenance or when replacing a clogged or aging filter. Because fuel filtration is a wear item, keeping a fresh 18-7930 on hand or on a maintenance schedule helps avoid fuel starvation, rough running, and stalling caused by restricted fuel flow. The filter is sold as a single replacement cartridge and installs into the existing add-on filter kit housing already present on the covered fuel system.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7930
• Product Type: Fuel Filter
• Fitment: 1977-83 fuel system with add-on filter kit
• Micron Rating: 20 micron
• Size: 5/16 inch (79 millimeters)
• Item Diameter: 79 millimeters
• Weight: 0.35 pounds
• Replaces (OEM): OMC 173326

Fitment

• 1977-83 fuel system with add-on filter kit (OMC)

Replaces (OEM)

• OMC 173326

Frequently Asked Questions

What does the Sierra 18-7930 fuel filter replace? The Sierra 18-7930 is a direct replacement for OMC 173326, designed for 1977-83 fuel systems equipped with an add-on filter kit.

What is the micron rating of the 18-7930 fuel filter? The 18-7930 carries a 20 micron filtration rating, which sizes it to trap fine contaminants while maintaining fuel flow to the engine.

What size is the Sierra 18-7930 fuel filter? It measures 5/16 inch, or 79 millimeters, in diameter.

Does the 18-7930 fit any fuel system? No, the Sierra 18-7930 is fitted specifically to 1977-83 fuel systems that use an add-on filter kit; it is not a universal fuel filter.

How much does the 18-7930 fuel filter weigh? The Sierra 18-7930 weighs 0.35 pounds.

Is the Sierra 18-7930 an OEM part or aftermarket? The 18-7930 is a Sierra-manufactured aftermarket fuel filter made to replace the OEM number OMC 173326.

How do I know if OMC 173326 is the right cross-reference for my filter kit? If your existing add-on filter kit fuel filter is stamped OMC 173326, the Sierra 18-7930 is the correct replacement for a 1977-83 fuel system with that setup.

What is included when I order the 18-7930? The Sierra 18-7930 ships as a single replacement fuel filter cartridge for installation into an existing add-on filter kit housing.

How often should the 18-7930 fuel filter be replaced? Fuel filters like the Sierra 18-7930 are a wear item and should be replaced as part of routine fuel system maintenance to prevent restricted fuel flow and stalling.

Will a clogged 18-7930 cause engine problems? Yes, a clogged Sierra 18-7930 can restrict fuel flow and lead to fuel starvation, rough running, or stalling in the 1977-83 add-on filter kit fuel system it serves.

Is the Sierra 18-7930 filter housing included? No, the 18-7930 is the replacement filter element only; it installs into the fuel system's existing add-on filter kit housing.