 Complete the following phrase:  Despite qualifying in 7th place for his home race in Melbourne, Mark Webber finished down in 13th due to a persistent problem with a fuel flap that closed as the pit mechanics went to put the fuel in and when it was opened it remained open until the next pit stop greatly increasing drag and decreasing airflow over the rear wing. It was worse for David Coulthard however, who crashed heavily with Williamss Alexander Wurz in the late stages of the race. 