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post #11 of 17 Old 05-28-2018 Thread Starter
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Re: Yanmar problem

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Originally Posted by Minnewaska View Post
Have you changed the filters? If they are clogged, it would be fuel starved and perhaps the wd40 is simply being burned as fuel.


Filters are new


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post #12 of 17 Old 05-28-2018
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Re: Yanmar problem

Since it runs on spraying WD40 into the air inlet, it definitely is a fuel issue. Air in the system is the first to check out. Sounds like you have bled up to the engine filter, but have you bled at the injection pump? it's a small hex fitting on the pump.

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post #13 of 17 Old 05-28-2018 Thread Starter
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Re: Yanmar problem

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Originally Posted by overbored View Post
not sure how you would connect noid lights to a mechanical fuel injection system so that may not be sound advise. if the engine was running and quit then most likely you have sucked in some airing the fuel system and will need to bleed the system. if you are going crank the engine a lot to do this make sure you close the raw water intake valve so you do not fill the engine with water through the exhaust. here is a manual and it has a how to bleed the fuel system section near the end of the manual p 142
http://j30.us/files/YanmarGM&HMWorkshopManual.pdf


Thank you, this should be helpful


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post #14 of 17 Old 05-28-2018 Thread Starter
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Re: Yanmar problem

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Originally Posted by JimsCAL View Post
Since it runs on spraying WD40 into the air inlet, it definitely is a fuel issue. Air in the system is the first to check out. Sounds like you have bled up to the engine filter, but have you bled at the injection pump? it's a small hex fitting on the pump.


I have not not, I will be going to the boat later today and will give that a try


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Re: Yanmar problem

Update:
Went to the boat earlier today, bled the injector pump, and it started up . Seemed to be running fine. I let run at the dock for about 30 minutes with no issues, so we decided to try heading out and try it for real. We had a pleasant sail and motored back to the dock without issue.
Looks like air in the fuel system was the issue after all. Thanks to everyone who offered suggestions.


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post #16 of 17 Old 05-28-2018
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Re: Yanmar problem

Where did the air get in.? If not just old plugged filter ?Something to ponder now you know how to bleed filters, injector pump, injectors and are feeling confident about your engine.
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Re: Yanmar problem

Thanks for the update. Glad my suggestion to bleed the injector pump fixed the issue. My guess is the air came from the filter changes. I learned about the bleed connection on the injection pump the hard way as the Yanmar manual I have makes no mention of it.

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