Williams trace cause of Rosberg's problem

The German had looked set to score his second consecutive points-scoring finish of the season at Sepang, but he stopped late in the race due to the water leak.

After a thorough investigation back at the team's Grove factory, the team have traced the fault back to the dry-break coupling.

With the team determined to get on top of the reliability issues that cost them so much last year, the Malaysian issue has left Rosberg more concerned that he had been at the start of the season.

"Of course it is a worry, because we have had a few problems lately," said Rosberg. "Although I am confident we can get it sorted, because we have solutions for the problems we have had, when you start seeing one, two or three problems then you start to get a bit worried.

"We had such a good winter and such a good start to the year, so it was a big surprise that it stopped me in Malaysia, I thought we would get through."