Not sure about your Merc, but my 1990, 90 horse Merc had a fill under the motor when it was in the full up position.
When ever you get a new to you motor the first thing you should do is go get the book!! The best cash you will ever spend, I have one for all the motors I have ever owned.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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