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post #1 of 17 Old 05-27-2018 Thread Starter
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Yanmar problem

Hello,
I have a yanmar 2gm20f, today we started it up and it ran fine for several minutes in neutral as we were readying the boat, the we shoved off and made it about 100 yards before it suddenly died and would not restart.

We were able to unfurl the jib and sail back to the dock. At the dock I found the engine would run if I sprayed WD40 into the air intake. It would run as long as I sprayed but would die as soon as I stopped.

I have a racor filter between the fuel tank and the engine. When I open the vent at the top fuel runs freely out. There is a second filter on the engine, when I loosen the bleeder on top and pump the lever fuel pumps out. I dont know how to trouble shoot any further.

I had this boat for about 7 years and never had a problem.

Any advice? Can anyone recommend a mechanic in Buffalo NY?


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post #2 of 17 Old 05-27-2018
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Re: Yanmar problem

Crack the fittings on the injectors and see if you have fuel there. If no, a clog before them. If yes, test injector signal with noid lights. If fuel and signal, injector(s) are clogged.
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post #3 of 17 Old 05-27-2018
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Re: Yanmar problem

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

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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
If you aren't sure, maybe you should stay out of it

:lol:

I didn't know that this motor specifically was mechanical injection. Thanks for the clarification.
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Re: Yanmar problem

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Originally Posted by ianjoub View Post
If you aren't sure, maybe you should stay out of it

:lol:

I didn't know that this motor specifically was mechanical injection. Thanks for the clarification.
I have been working on Yammers for over 40 year and I have owned more then one GM series engine
I am very sure it is mechanical injection as are all Yanmars before some of the very newest engines.

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post #6 of 17 Old 05-28-2018
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Re: Yanmar problem

Great, expert eyes on this thread. A slight hi jack. Is it ok to spray WD40 into the air intake of a diesel?

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Re: Yanmar problem

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


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Re: Yanmar problem

Serviced/ tested your injectors lately..?
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post #9 of 17 Old 05-28-2018
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Re: Yanmar problem

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Originally Posted by overbored View Post
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.
Little thread drift here, but is there any detrimental affect on the impeller if you do this?
Since it's a pain to drain the muffler, which is what I have done when I found myself in this situation, I thought I'd try this in the future, but then I wondered about those rubber vanes.
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post #10 of 17 Old 05-28-2018 Thread Starter
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Re: Yanmar problem

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Originally Posted by aa3jy View Post
Serviced/ tested your injectors lately..?


Have not


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