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post #4 of Old 10-21-2012
SlowButSteady
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Re: Yanmar 1 GM will not start

If you have good compression (around 20:1), and it seems to crank at a reasonable rate, and still won't "catch" at all, about the only thing left is the fuel system. Assuming that you have bled the fuel lines, I would check the injector first then the high pressure pump. If it seems to "almost start", as in it catches for a second or two but never really gets going, you might have some sort of a restriction in the exhaust (but I doubt it).

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