Sierra 18-7718 Inline Fuel Filter, 5/16 Inch, Replaces Mercury Marine 35-879885T, Fits 4-Stroke Verado 135-275 HP

The Sierra 18-7718 is an inline, under-cowl fuel filter built for 5/16 inch fuel line connections on Mercury 4-Stroke Verado outboards. It mounts in the fuel supply line ahead of the engine to trap contaminants and debris before they reach the fuel system, helping protect injectors and carburetion components from the sediment, rust, and particulate that can build up in a marine fuel tank over time. The housing has a white finish with a metal outer body and uses a 30 micron filter media to catch fine particulate while maintaining consistent fuel flow to the engine.

This filter is a direct replacement for Mercury Marine part number 35-879885T and is designed to fit Mercury 135, 150, and 175 HP 4-Stroke Verado outboards (S/N 1B227000 and up), 200 and 225 HP 4-Stroke Verado outboards (S/N OT980000 and up), and 250 and 275 HP 4-Stroke Verado outboards (S/N OT801000 and up). Because it is a wear item in the fuel system, it should be inspected and replaced as part of routine fuel system maintenance to keep fuel delivery clean and consistent.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7718
• Product Type: Inline Fuel Filter
• Fitting Size: 5/16 inch
• Micron Rating: 30 micron
• Color: White
• Material: Metal
• Filter Type: In-line, under cowl fuel filter
• Weight: 0.06 pounds
• OEM Cross Reference: 35-879885T

Fitment

• Mercury 4-Stroke Verado 135/150/175 HP (S/N 1B227000 & Up)
• Mercury 4-Stroke Verado 200/225 HP (S/N OT980000 & Up)
• Mercury 4-Stroke Verado 250/275 HP (S/N OT801000 & Up)

Replaces (OEM)

• 35-879885T

Frequently Asked Questions

What does the Sierra 18-7718 fuel filter replace? The Sierra 18-7718 is a direct replacement for Mercury Marine part number 35-879885T.

What outboards does the 18-7718 fit? It fits Mercury 4-Stroke Verado outboards: 135, 150, and 175 HP models with serial number 1B227000 and up, 200 and 225 HP models with serial number OT980000 and up, and 250 and 275 HP models with serial number OT801000 and up.

What size fuel line does this filter use? The Sierra 18-7718 is built for 5/16 inch fuel line connections.

Is the 18-7718 an inline or spin-on filter? It is an in-line, under-cowl fuel filter, not a spin-on canister style.

What micron rating does the 18-7718 use? This filter has a 30 micron rating, which traps fine particulate while allowing consistent fuel flow to the engine.

What is the housing made of? The Sierra 18-7718 has a metal outer housing with a white finish.

How much does the 18-7718 fuel filter weigh? The Sierra 18-7718 weighs 0.06 pounds.

How do I know if my Verado's serial number qualifies for this filter? Check your outboard's serial number tag against the ranges the 18-7718 covers: 1B227000 and up for 135/150/175 HP Verados, OT980000 and up for 200/225 HP Verados, and OT801000 and up for 250/275 HP Verados.

Is the Sierra 18-7718 a genuine Mercury part or aftermarket? The 18-7718 is a Sierra-branded aftermarket fuel filter manufactured as a direct replacement for Mercury Marine 35-879885T, not an OEM Mercury part.

When should I replace the inline fuel filter on my Verado? The Sierra 18-7718 is a wear item that should be inspected and replaced as part of routine fuel system maintenance to keep fuel delivery clean.

Does the 18-7718 fit non-Verado Mercury outboards? The Sierra 18-7718 is specified for Mercury 4-Stroke Verado models in the 135 to 275 HP range with the serial number ranges listed; fitment outside those Verado models is not specified.

What comes with the Sierra 18-7718? The Sierra 18-7718 ships as a single inline fuel filter unit.