Why the fuel nozzel had fire on it at Hungary???

The 2008 Hungarian GP at Hungaroring-Budapest was an really hot race with soaring temprature's and which was agreed up on by the drivers,pitcrew,the visitors....and everyone present there...people also agreed that the fire in the pits especially seen during the pitstop of STR of sebastien bourdais,Williams of Kazuki Nakagima to name a few had fire in the fuel nozzle. The reason probably given by the teams were -'The reason for the fire was the volatile nature of the fuel and th high temprature at Hungary. But the inside story is diffrent.
The Inside Story-
The real reason is that as we all know losing position at the Hungarian GP(Hungaroring) is like never getting it back and vice-versa....The teams didnt wanted to lose any position of theirs due to pit-stops and/or wanted to gain a few due to the pit-stops too.
The way of guzzing the fuel into an f-1 car is-

thefuel to be inserted into the fuel tank is set beforehand,consider 5L....but due to the mechanical constraints the fuel comming out of the nozzel is usually a bit more than the set amount...as the fuel comes out really at a high rate of speed its difficult for the fuel delivery system to deliver exact quantity of fuel especially due to its liquid nature.
According to the right way of putting fuel in the car the refueller must not take the nozzel out until the fuel which is comming out is completely out of the guzzler but to save valuabe seconds the teams decided that they would remove the guzzler before all the fuel is put into the car......maybe they have been doing this for quite a few races but their trick backfired due to the high tempratures at Hungary!!