The routine of Nicolás Maduro, grappling with intensive gasoline shortages, reported it will scale back its longstanding gasoline subsidy and privatize assistance stations, in a sizeable change for Venezuelans extended accustomed to filling up their cars and trucks totally free of demand.

The steps, which choose result on Monday, are a gamble for Mr. Maduro as he struggles with a devastating financial crisis and attempts to outlast U.S.-led sanctions meant to topple his authoritarian administration.