Dokili Fuel Filter Kit — 2-Pack for Mercury Optimax/Verado, 2‑Micron with Removal Tool, OEM Fit

Dokili's 2-piece fuel filter kit for Mercury Optimax and Verado outboards provides 2-micron filtration plus a removal tool to keep fuel clean and engines running smoothly.

This replacement kit is made for Mercury/Mariner Optimax DFI and Verado L4/L6 engines (75–250 HP) and compatible stern drives, built to match the OEM form and fit. Each kit contains two high-efficiency filter elements with pre-installed O-rings and a socket-style removal tool so you can service the inline under-cowl vapor separator tank (VST) filter quickly without damaging the cap. The media traps microscopic particles and free water, protecting injectors and maintaining consistent fuel flow under load.

Will this filter fit my Mercury Optimax or Verado engine?

Yes — the Dokili elements are engineered as direct replacements for common OEM and aftermarket part numbers, making them suitable for a wide range of Mercury/Mariner and compatible stern drive applications. The shape, sealing surface, and overall dimensions match the factory inline VST filter requirements so installation uses the factory housing.

• Fits Mercury/Mariner Optimax DFI and Verado L4/L6 engines from 75HP to 250HP.
• Direct replacement numbers include 8M0122423, 8M0020349, 884380T, and others.
• Also compatible with MerCruiser 4.5L and 6.2L stern drive engines.
• Designed for under-cowl vapor separator tank (VST) inline filter systems.

How does the 2-micron media help my boat's performance?

The 2-micron filter paper captures very fine contaminants and free water before fuel reaches injectors, reducing hesitation, rough idling, and loss of acceleration caused by blocked or dirty fuel passages. Cleaner fuel helps preserve fuel pumps and injectors, which supports consistent throttle response and peak power delivery when you need it.

• 2-micron filtration removes microscopic dirt, scale, and particulates.
• Water separation reduces corrosion and injector fouling risk.
• Supports steady fuel pressure under varying loads.
• Helps restore peak horsepower and smoother acceleration.

What comes in the kit and how easy is installation?

The kit includes two replacement filter elements, each with a fuel-resistant O-ring already installed, plus one socket-style removal tool to loosen and tighten the filter housing without cracking the cap. Installation is straightforward and typically completed with the engine off and fuel pressure relieved; the removal tool speeds the job and protects the housing from damage.

• Includes 2x filter elements and 1x removal tool socket.
• Pre-installed rubber O-rings reduce risk of leaks and simplify sealing.
• Fuel-resistant polymer construction for marine durability.
• Tool prevents stripping or cracking of the filter cap during service.

How often should I replace these filters?

Replacement intervals vary with fuel quality, hours, and operating conditions, but routine inspection and scheduled replacement are important for reliable operation. Check your owner's manual for manufacturer guidance and inspect filters whenever you experience rough running, reduced power, or after running with suspect fuel; change sooner if fuel contamination is visible.

• Follow engine maker recommended service intervals when possible.
• Replace if fuel discoloration or water separation is observed.
• Consider more frequent changes with poor fuel quality or heavy use.
• Keep a spare element aboard for quick field exchange.

Who is this for: Boaters, technicians, and marine DIYers who operate Mercury/Mariner Optimax or Verado outboards (75–250 HP) or compatible MerCruiser stern drives and need a reliable, OEM-fit filter solution. The Dokili kit suits anyone wanting high-efficiency filtration, straightforward installation, and a tool to avoid damage during service—ideal for routine maintenance, pre-season checks, or addressing fuel-related drivability issues.