yanmar 2qm15 fuel problems - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 04-01-2011
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yanmar 2qm15 fuel problems

I have a 2qm15 which had gotten water in the tank several times before I figured out what was going on. I cleaned the tank, lines, replaced filters and it ran fine for awhile. Now it is difficult to start when cold, dumps raw fuel out the exhaust with black and white smoke, then mostly clears up, and will power up in or out of gear to almost full power. However, when I throttle back, then up again, it belches raw fuel, black and white smoke. I pulled the exhaust elbow and found the smaller line coming from the cylinder head into the elbow almost blocked. Cleaned it out and replaced the elbow, but still has raw fuel, black and white smoke out of the exhaust. I haven't tried injector cleaner yet. Is that a good next step, or any other suggestions?
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Old 04-01-2011
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If you have been running with water in the fuel it is a big risk that your injector nozzles needs to be replaced.
Pull the injectors and send to a shop.
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fresh water

Thanks Haffiman 37. The water that got in the engine was all fresh. Do you think I could try an injector cleaner first, and are some brands better?
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Old 04-01-2011
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Fresh or salt in the injectors does not matter that much.
Most likely if taking the injectors apart, you will find that the needle in the nozzle has 'blued' out, and when pressure testing the injectors 'drips'.
Injector 'cleaners' may clean for carbon build-up, but not this problem.
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Old 04-01-2011
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Haffiman is 100% right. You need new tips on the injectors.
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Thank you guys. I will post results and send you messages of the outcome.
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Old 04-01-2011
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Remove the injectors and send/take them to a local 'injector shop'. Every town over 10000 pop. usually has one. Most times such injectors can be remedied and/or 'rebuilt'.
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