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Ihave a single cylender 178 china yanmar diesel

Ihave a single cylender 178 china yanmar diesel engine. had water in fuel . cleaned water out of system and now I cant. get fuel pump to pump fuel. took pump out and it will pump by hand. checked cam shaft and it is turning . where to now?

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These engines have a mechanical injector and when water gets in them the best way to say this has larger particals then the diesel the best way is to remove the injector and the fuel lines and spray a carb cleaner in then this will dissipate the water place the injector in a pan and heat up on a stove not to get to hot this will dry out the injector then when this is done spray wd-40 in where the fuel tube supplies the fuel do not touch the tip or bump or drop striking the tip that goes in the engine you will have to replace it then reinstall all the removed parts keep the line lose at the injector crank the engine till fuel starts flowing do not hole the ling with a finger you can blow a hole and inject fuel in to your blood these pumps build a massive pressure when lines held .
when the fuel flows start to tighten the line what your doing is purging the air out as well as any water. when you get the lines to where their is a dropping of fuel the engine should start to run it will be ruff and smoke with a wrench loosen then tighten line a couple times wile it is running then snug the line the fuel in the injector will push what rest of the air out and it will smooth out . DO NOT USE STARTING FLUID ON THESE ENGINES you can crack the case they cant take the stress. i hope this helps

Posted on Aug 31, 2010


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