Several drivers had their Hungarian Grand Prix spoiled by problems with the refuelling equipment – which worryingly caused a number of fires.
Sebastien Bourdais, Rubens Barrichello and Nico Rosberg were among the drivers affected. But what was the cause of the problems?
Sebastien Bourdais was the first to suffer a problem when he pitted on lap 31. Fuel leaked from the vale and caught fire, and the team doused the car with extinguisher foam before sending him back on track again. It happened again at his second stop as well, as he explained afterwards:
It all went to hell at the first pit stop, as the guys had to use the fire extinguisher and I got a lot of foam on my visor.
It happened again at the second stop and this time I had foam inside and outside my visor and couldn’t see a thing so had to make another stop to get it cleaned.
Rubens Barrichello also suffered a fire when he pitted and the team had to switch to the reserve fuel rig to get fuel into the car.
Team boss Nick Fry suggested the problem was caused by the heat at the Hungaroring causing leftover fuel in the system to expand, causing the valve to malfunction. But although the temperature was above 30C, it’s not unusual for F1 races to be held in hotter weather.
Honda had a problem with their fuel rig in the British Grand Prix as well, and afterwards Ross Brawn said Barrichello would have finished second that day (instead of third) without the delay.
Nico Rosberg was also delayed by a problem with his refuelling rig, although there was no fire.