This article is from the Formula One Motor Racing FAQ, by firstname.lastname@example.org (Mitchell McCann) with numerous contributions by others.
After being banned for 10 years for safety reasons, mid-race re-
fueling was inexplicably reintroduced for the 1994 season. The
re-fueling equipment used by all the teams is identical as the
FIA mandates that the equipment be bought from Intertechnique
and may not be modified by the teams. Fuel is pumped at a rate
of 12 liters (3.3 gallons) per second.
Apart from the FIA, almost everybody associated with F1, fans,
drivers and teams, believe that re-fueling is inherently
dangerous and that, if not before, it will finally be banned
when somebody is killed or seriously injured in a re-fueling
accident. Since its reintroduction in '94 there have already
been three pit-lane fires caused by re-fueling: Verstappen
(Benetton) in '94, Irvine (Jordan) and Gachot (Pacific) in '95
and Diniz's on-track fire in '96 was due to the re-fueling valve
becoming stuck open.