Listen to this article Perez and team-mate Max Verstappen were both sidelined in the closing laps of the Bahrain Grand Prix last month by a fuel pump issue, costing the team P2 and P4. A separate fuel system problem emerged on Verstappen’s car with 20 laps to go in last Sunday’s Australian Grand Prix, forcing him to retire and leaving the reigning world champion 46 points off early standings leader Charles Leclerc. Verstappen called the reliability struggles “unacceptable” after the race, and said he could not give any thought to the championship amid Red Bull’s current struggles. Perez was able to pick up the pieces from Verstappen’s Australia retirement and finish the race second for Red Bull behind Leclerc, but admitted the continued reliability issues were a worry. “It’s certainly a concern,” Perez said. “We’ve lost a lot of points already in these first three races that in the end can make a huge difference in the championship. So we are obviously aware of it. “All …