Join the Nasdaq Community today and get free, instant access to portfolios, stock ratings, real-time alerts, and more! LONDON, Aug 28 (Reuters) - Hedge fund managers continued to liquidate their bullish positions in crude and fuels, amid negative sentiment towards petroleum, before prices rallied sharply in the second half of last week. Fund managers have reduced their net long position in 13 of the last 18 weeks, by a total of 508 million barrels (36 percent), according to an analysis of records published by regulators and exchanges.