The Venezuelan-born driver, who is racing under a Spanish licence, was one of the pace-setters early on in the session, and manage to hold the top spot when the chequered flag fell.
David Beckmann, who topped the practice session this morning, could only manage the seventh fastest time ahead of Alex Peroni, who returns to the F3 championship following his major crash at Monza last year.
Dutchman Richard Verschoor, who won the Macau Grand Prix in the F3 car last year, was ninth while Roman Stanek rouned out the top ten, having only been confirmed as an entry for the weekend on Thursday.
Saturday's Feature Race will get underway at 10:25 AM local time, with the top ten finishers reversing positions for the start of Sunday's Sprint Race.
Bahrain International Circuit - Winter testing