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What is this part on Yanmar 1GM?

2K views 7 replies 5 participants last post by  smurphny 
That's the high-pressure side of the fuel injection pump, the fuel line goes from there to the injector, the low pressure comes in on the side of the pump. You should bleed to the low pressure side using the manual pump (there is a bleed screw on the top of the filter and another on the banjo fitting on the injection pump), and then the high-pressure side by cracking the fitting at the injector and turning the engine over until no more bubbling.
 
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