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Re:F1 2014: All aboard the 'power train' - new rules explained by po on Tuesday December 03, 2013 @07:21AM (#6839821)
One search youtube for 'f1 fuel fire' for some examples of how it can be dangerous but this is a good example of what you're talking about:

http://www.youtube.com/watch?v=HdyuN_cUqjA

I don't think F1 had this problem but with some races the fuel is made with methanol and the flames can be impossible to see:

http://boingboing.net/2010/11/03/its-hard-to-fight-a.html

Re:F1 2014: All aboard the 'power train' - new rules explained by exDM69 on Tuesday December 03, 2013 @07:40AM (#6839887)
That video of Jos Verstappen's pitstop fire is quite disturbing. That fire was partially caused by the fueling rig that had been tampered by removing a filter to allow faster refueling.

Here's another disturbing pitstop fire of Heikki Kovalainen leaving the pit stall with the fueling hose still attached and the fuel gets sprayed on his compatriot Kimi Räikkönen, who went on to finish the race in 5th spot. http://www.youtube.com/watch?v=OvgjhfQLTNk http://www.youtube.com/watch?v=Hzg_9UXo9s8

Trying to refuel 50 liters (15 gallons) or more in less than 10 seconds is bound to be dangerous.