1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 363Get this manual
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and turn adjust ing nut clockwise to 10"cr fuel level and counterclockwi to rais fuel level (l !6 -t urn adjusting nut equals proximately16"1.6mmJ in fuel leve l)6 AlLer adjus tment, ighten loc crew,