BUDAPEST, Aug 4, 2008 (AFP) - The spectre of the blaze that engulfed Jos Verstappen´s Benetton during the 1994 German Grand Prix was revived briefly during Sunday´s Hungarian Grand Prix - and has left Formula One´s team chiefs concerned at current safety standards.

Several of the teams admitted they did not understand why there was a spate of flash fires due to problems with their refuelling rigs during Sunday´s race.

The Honda, Toro Rosso, Toyota and Williams teams all suffered problems and lost time as well as being exposed to danger when fuel escaped.

Honda team boss Nick Fry said: "We spilt about half a litre of fuel and it was put out quickly and then we switched to our other rig to fuel the car as normal. No harm was done, but it is unusual to have so many small fires like this.

"It seems it may be a coincidence, but that is all. As far as we know, the refuelling rig did not go on square and that was it, but we need to know more really."

Toyota boss John Howett said: "I think we have to look at it very carefully. When you have high temperatures, you get a bit of pressure coming out of the fuel tank and you cannot cool it down.

"Everyone was struggling with it and we did as much as we could, but it is a temperamental thing. And we cannot adjust the rigs. They are standard kit."

The refuelling pit-stops saw fires attract attention and cause alarm, but there was no panic.

Dutchman Verstappen was infamously caught in a blaze in his car during a refuelling fire 14 years ago that led to an overhaul of the system used - and the discovery that his team had removed a filter from their rig to make their fuel flow faster.

The pitstop inferno of Verstappen: