Sierra 18-7789 Fuel Filter, 21 Micron, Cobra EFI, Replaces OMC 502906

The Sierra 18-7789 is a 21 micron fuel filter engineered for Cobra EFI fuel systems, providing filtration to protect fuel injectors and engine components from contaminants that can cause performance issues or premature wear. This filter is designed as a direct replacement for OMC 502906, giving boat owners a reliable option when their factory fuel filter needs replacing.

Built with a plastic outer housing, the Sierra 18-7789 is compatible with Volvo SX/EFI and Cobra EFI vehicle service types, making it a straightforward swap for these fuel system applications. Sierra fuel filters are manufactured to meet or exceed the specifications of the original equipment parts they replace, giving buyers confidence in fit and function without paying for a factory-branded part.

Routine fuel filter replacement is a key part of marine engine maintenance, helping prevent clogged injectors, poor idle, and reduced fuel efficiency caused by debris or water contamination in the fuel supply. The 18-7789 ships as a single fuel filter unit, ready to install in place of the original Cobra EFI filter.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7789
• Filtration Rating: 21 Micron
• Vehicle Service Type: Volvo SX/EFI, Cobra EFI
• Outer Material: Plastic
• Weight: 0.69 pounds
• UPC: 808282244811

Fitment

• Volvo SX/EFI fuel systems
• Cobra EFI fuel systems

Replaces (OEM)

• OMC 502906

Frequently Asked Questions

What does the Sierra 18-7789 fuel filter replace? The Sierra 18-7789 is designed to replace OMC 502906, making it a direct-fit option for boats using that original fuel filter.

What micron rating is the 18-7789 fuel filter? This fuel filter carries a 21 micron filtration rating, which is the standard rating for this Cobra EFI application.

Is this filter compatible with Volvo Penta fuel systems? Yes, the Sierra 18-7789 is listed for Volvo SX/EFI vehicle service type as well as Cobra EFI fuel systems.

What is the 18-7789 fuel filter made of? The outer housing of the Sierra 18-7789 fuel filter is made of plastic.

How much does the Sierra 18-7789 fuel filter weigh? The Sierra 18-7789 fuel filter weighs 0.69 pounds.

Is the Sierra 18-7789 a genuine OEM part or an aftermarket replacement? The 18-7789 is a Sierra-manufactured replacement fuel filter, built to meet or exceed the performance of the original equipment Cobra EFI filter it replaces.

How many fuel filters come in a package of the 18-7789? The Sierra 18-7789 is sold as a single fuel filter unit.

What is the UPC for the Sierra 18-7789 fuel filter? The UPC for the Sierra 18-7789 fuel filter is 808282244811.

Why would I need to replace my Cobra EFI fuel filter? Fuel filters like the Sierra 18-7789 should be replaced periodically to keep contaminants out of the Cobra EFI fuel system, since a clogged filter can lead to reduced engine performance.

Does the Sierra 18-7789 fit the same applications as OMC 502906? Yes, since the Sierra 18-7789 replaces OMC 502906, it is intended for the same Cobra EFI fuel filter applications.