McLaren: Morning running was compromised 5 February, 2013 Jenson Button The morning’s running was compromised by a mechanical fuel-pump issue, which cost a couple of hours’ track-time, but the problem was quickly rectified and the team was able to run productively for the remainder of the afternoon. Jenson spent the first part of the day’s programme running a lower-lip rake to complete some aero mapping work. The end of the day saw the team evaluate the effects of a series of mechanical set-up changes, using both the Supersoft and Hard Pirelli tyres. Both the aero mapping and the balance changes fell in line with the team’s pre-test expectations. Jenson set his fastest time of the day on the Hard compound. What’s next? Sergio Perez gets his first opportunity to drive a Vodafone McLaren Mercedes car tomorrow (Wednesday). The knock-on effects of this morning’s fuel-pump issue mean that he will begin his day by continuing today’s initial aero and balance checks. The aim for tomorrow afternoon is to conduct a series of longer runs – possibly incorporating live pitstops into the mix if the team is satisfied with the day’s initial progress.