SUN <SUN> RAISES HEATING OIL BARGE PRICE Sun Co's Sun Refining and Marketing subsidiary said it increased the price it charges contract barge customers for heating oil in New York harbor 0.50 cent a gallon, effective today. They said the 0.50 cent increase brings Sun's contract barge price to 49 cts. The recent price hike represents the fifth this week, totalling 4.75 cts. The increases are following sharp spot and futures price rises, the company said.