I have a really clean Nissan 30HP 4 stroke NSF30B . Has been cared for just not used much lately due to being overworked at my job . I do hook the ears up and start the boat every 2 weeks . water seemed weak lately so figured good time to install new impeller, All has been working good the last few weeks but now all of a sudden no water at tell tail. checked output tubes and nothing blocking. I have pulled the thermostat and looks bad so i will replace it, but I did put it back together without thermostat just to check but still no water . I did fire the engine up with the thermostat cover off and plenty of water flow! Could I have a clog inside the engine ? If so are there any tricks to unclog without pulling the head ? Thanks for any advice !
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