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My yanmars have a small plunger pump built in. On the top of the fuel filter there is a small plunger also. I've learned to pump the new filters full of fuel with the plunger on top, probly 50 pumps, and then I'm good to go. If there is air in the system I have to crack the injectors loose and pump the plunger to fill the entire system. Probly 100-150 pumps. It's a pain but you learn quick. I have my electric jabsco oil change pump/bucket combo on board I will use to suck it next time if I get alot of air.
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