Sierra 18-7855 Fuel Filter, Rochester Carburetor Inlet Type, Replaces OMC 910139 and 983870

The Sierra 18-7855 is a Rochester carburetor inlet-type fuel filter built to meet or exceed the quality of the original equipment part it replaces. It is designed to trap contaminants and debris before fuel reaches the carburetor, protecting jets and needle valves from clogging and helping the engine run on clean, consistent fuel delivery. The filter carries a 20 micron rating, providing fine filtration suited to carbureted marine engines that rely on a Rochester-style inlet fitting.

Construction uses a plastic outer housing sized for a direct drop-in fit at the carburetor fuel inlet. The 18-7855 is a straightforward service part for routine fuel system maintenance, and is cross-referenced to the OMC part numbers it replaces so you can order the correct Sierra equivalent using either the Sierra number or the original OMC number.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7855
• Product Type: Fuel Filter
• Filter Inlet Type: Rochester carburetor inlet
• Micron Rating: 20 micron
• Outer Material: Plastic
• Weight: 0.01 pounds
• Unit Count: 1

Fitment

• Rochester carburetor inlet-style fuel systems

Replaces (OEM)

• OMC 910139
• OMC 983870

Frequently Asked Questions

What does the Sierra 18-7855 fuel filter replace? The Sierra 18-7855 is a direct equivalent for OMC fuel filter numbers 910139 and 983870, so it can be ordered as a drop-in replacement using either the original OMC number or the Sierra number.

What is the micron rating of this fuel filter? The 18-7855 carries a 20 micron rating, which determines how fine the particles are that it traps before fuel reaches the carburetor.

What type of carburetor does the 18-7855 fit? This filter is built for a Rochester carburetor inlet type fuel connection, matching the inlet fitting used on Rochester-equipped marine engines.

What material is the Sierra 18-7855 filter made from? The outer housing of the 18-7855 fuel filter is plastic.

How much does the Sierra 18-7855 fuel filter weigh? It weighs 0.01 pounds.

Is the Sierra 18-7855 a genuine OMC part or an aftermarket equivalent? The 18-7855 is a Sierra-manufactured aftermarket fuel filter designed to meet or exceed the quality of the OMC 910139 and 983870 fuel filters it replaces, rather than an OMC-branded original part.

How many filters come in the package? The Sierra 18-7855 is sold as a single fuel filter, one unit per package.

Will the 18-7855 fit a carburetor with a different inlet style? No. The 18-7855 is built specifically for a Rochester carburetor inlet type connection, so it should only be used on fuel systems with that inlet fitting.

How is the 18-7855 different from other Sierra fuel filters in the same family? The 18-7855 is the Rochester carburetor inlet version; other part numbers in the same catalog grouping use different inlet fittings and are not interchangeable with the 18-7855.

How often should a fuel filter like the 18-7855 be replaced? Sierra fuel filters such as the 18-7855 are routine maintenance items intended to be replaced whenever fuel flow restriction or contamination is suspected, or as part of regular fuel system service.