This inline fuel filter (code 4-05000300) is an ideal solution for a wide range of small outboard motors commonly used on inflatables, fishing boats, and other portable applications. It is a direct replacement or upgrade for OEM filters found in engines from Mercury, Yamaha, Tohatsu, Parsun, and other brands in the 4–30HP class. For example, Mercury/Mariner 4-stroke outboards (4/5/6 up to 25HP), Tohatsu two-strokes (M5B, M9.8) and four-strokes (MFS 4–30HP), as well as older Yamaha F4–F9.9 engines – all of these can utilize this filter in their fuel lines.
Installation is very simple: cut the fuel hose (if there isn’t already a filter assembly) and insert the filter in-line – make sure the arrow on the filter points toward the engine (direction of flow). The filter’s clear body is extremely convenient because it allows you to see if any impurities or water droplets have been caught. If your small engine is running rough or stalling, checking this filter should be one of the first steps – a quick replacement often solves fuel flow issues. Keeping fuel clean in small carbureted engines is crucial since their jets can clog easily; this inexpensive filter is effective insurance against such problems.
- Ideal for small outboard engines on inflatable boats, fishing kayaks, and other vessels where portability and reliability are key – this filter helps your motor run smoothly even if fuel has been stored in the tank for a while
- Recommended as a spare: The compact 4-05000300 filter is easy to keep in your emergency kit – if you suspect dirty fuel, you can swap it out quickly in the field without special tools
- Broad compatibility: Also compatible with many Chinese and alternative brands (e.g., Parsun, Hidea) which often use similar fuel systems – it covers a wide range of low-horsepower outboards
- Engine protection: Using this universal filter protects your investment – clean fuel means fewer unexpected carburetor or injector repairs and more time enjoying your time on the water





