Ezekiel Odera, who is on loan from AFC Leopards, set the ball rolling in the 10th minute from the penalty spot. Duke Abuya levelled the scores nine minutes after the break with a penalty of his own.
However, Chrispinus Onyango grabbed a quick brace in the 61st and 65th minutes to help his team to a 3-2 win. It is the first time KCB have won against Sharks this season, having drawn and lost the initial two games in all competitions.
The Sugar Millers hit the opener in the 27th minute courtesy of Derrick Otanga who was at the end of a perfectly executed move. The striker, who has now scored 13 goals this season, completed his brace in the 38th minute.
The last nail on the coffin of the Melis Medo led side was powered by Solomon Omollo in the 48th minute. Brian Nyakan pulled one goal back for his side.
Mount Kenya are on 18 points, and the best they can do if they manage to win their remaining three games is finish 17th with 27 points.