Yanmar 2GM20F Fuel Filter Replacement
A clogged fuel filter starves your Yanmar 2GM20F of fuel — hard starts, hesitation and lost power at speed. Below is the filter we recommend, which 2GM20F variants it fits, a step-by-step video, and the symptoms to look for.
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Watch: how to do it (step by step)
How to replace the fuel filter on a Yanmar 2GM20F
Bleeding fuel line Yanmar 2GM20F J/105
Tools Needed
- Flashlight
- 20-ounce glass
- 12mm wrench or socket
- 10mm wrench or socket
- 14mm wrench or socket
Safety
- Be cautious when opening the fuel filter to avoid spillage.
- Ensure you have a 20-ounce glass ready to catch any spilled fuel.
Steps
- Locate the fuel filter at the back of the engine.
- Check the fuel filter for any air at the top where the beige meets the red.
- If there is air, fill the fuel filter to the top before proceeding.
- Crack the fuel filter slightly to release any air, using a 20-ounce glass to catch any spilled fuel.
- Locate the low-pressure fuel pump and the lever that sucks fuel into the high-pressure pump.
- Push the lever enough times to suck fuel into the high-pressure pump.
- Locate the 12mm bolt and crack it to release air bubbles.
- Run the engine or pump it to see air bubbles pop out, indicating that the system is being bled.
- Locate the 10mm bolt and crack it to release more air bubbles.
- Locate the two metal pipes that lead to the injectors.
- Crack the 14mm bleed screws on the injectors, turning each one a quarter or half turn.
- Tighten the bleed screws back up.
- Turn the engine over for about 30 seconds to bleed the system.
- Repeat the process, using the lever multiple times if necessary.
Tips
- Use a socket wrench for the 10mm bolt instead of the Phillips head.
- The order of operations for bleeding the system may vary, so rotate through the steps until the system is fully bled.
Which part do I need for my Yanmar 2GM20F?
For most 2GM20F owners the part above (128270-12540) is the right choice. Price tip: the aftermarket numbers are usually noticeably cheaper than the OEM-branded box — it is the same physical part. If you need an exact match, these compatible part numbers also fit:
Show all compatible part numbers (6)
| Part number | Description | Fits | |
|---|---|---|---|
| 104500-55710 | Yanmar, Fuel Filter, 104500-55710 | 2GM20F | Find on Amazon → |
| 24341-00044 | Yanmar, Fuel Filter O-Ring, 1A S-44.0, 24341-000440 | 2GM20F | Find on Amazon → |
| YAN104500-55710 | Yanmar Secondary Fuel Filter | 2GM20F | Find on Amazon → |
| YAN128270-12540 | Yanmar Air Filter ( Intake Element ) | 2GM20F | Find on Amazon → |
| YAN23418-060000 | Yanmar Nylon Secondary Fuel Filter Housing Bleed Washer | 2GM20F | Find on Amazon → |
| YAN24341-000440 | Yanmar Secondary Fuel Filter O-Ring 1A S-44.0 | 2GM20F | Find on Amazon → |
Many of these are the same physical part under different brand numbers. Build years are shown where our parts data has them. Where a variant has no years, only the model code is listed. Confirm against your engine plate before ordering.
Frequently asked questions
What fuel filter fits a Yanmar 2GM20F?
The Yanmar 2GM20F uses the fuel filter sold as 128270-12540, plus its OEM and aftermarket cross-references (6 compatible numbers are listed above). Confirm the number against your engine's model code and year plate before ordering.
How often should I replace the fuel filter on a Yanmar 2GM20F?
Replace the fuel filter once a season or per the service manual — and sooner after a batch of dirty fuel or water in the separator.
What are the symptoms of a clogged fuel filter on a Yanmar 2GM20F?
Hard starting, hesitation or surging under load, stalling at higher throttle and a general loss of power. The engine typically runs fine at idle and starves when fuel demand rises.
Do I need to bleed or prime the fuel system afterwards?
On diesel engines, yes — air must be bled from the fuel system after the filter change, and the video shows the procedure. On petrol outboards, squeeze the primer bulb firm before starting.
How long does a fuel filter change take on a Yanmar 2GM20F?
Usually 30-60 minutes including priming or bleeding — a straightforward DIY job with basic tools.
Related guides
- Yanmar 2GM20 fuel filter
- Yanmar 3GM30 fuel filter
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