McLaren has revealed that Jenson Button's retirement from the Italian Grand Prix at Monza was caused by a fuel pump issue that hadn't been experienced by the team before.

Button was running second to team-mate Lewis Hamilton when his car ground to a halt on the run to the Parabolica, all but ending his hopes of battling ahead of Fernando Alonso to secure a second championship title.

Despite his win in Belgium a week earlier, Button's retirement means he is now 78 points down on Alonso in the title race heading to Singapore this weekend, with technical director Paddy Lowe confident there would be no repeat of the issue that forced him out in Italy.

"It was a problem that we haven't had before and it wasn't an easy one for us to identify," he said in a Vodafone McLaren Mercedes phone-in. "We were very disappointed about the retirement and it was really gutting to see the car roll to a stop at Monza.

"We have fortunately managed to identify the root cause and it was a problem with the fuel pump. It's something we have now completely covered for the remaining races."

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