The origins of Top Fuel racing saw a split in the sport in 1958 when the NHRA banned nitro in all categories, while the American Hot Rod Association (AHRA) continued to allow it. This led to the development of Fuel Dragsters (FD), Hot Roadsters (HR), and Fuel Coupés (FC). Independent drag strips, not sanctioned by the NHRA, also provided venues for fuel racers. The first U.S. Fuel and Gas Championship was hosted by Smokers Car Club at Famoso Raceway in March 1959, with Bob Hansen winning Top Fuel Eliminator (TFE) with a speed of 136 mph (218.9 km/h).
In 1971, Don Garlits introduced the Swamp Rat XIV, a rear-engined Top Fuel dragster, which proved to be the first successful design of its kind and won the 1971 NHRA Winternationals. The 1984 season saw Top Fuel struggling to attract full sixteen-car fields, leading to reduced rosters, and even the IHRA dropping the category entirely, before a resurgence sparked by Joe Hrudka’s Cragar-Weld Top Fuel Classic and Don Garlits’ return to full-time racing.
The most prolific active driver in Top Fuel is Tony Schumacher, while Alan Johnson is the most successful crew chief, having worked with six of Schumacher’s championships, as well as Gary Scelzi’s back-to-back titles. Shirley Muldowney is recognized as the first, and most associated, female driver in the drag racing world, winning three championships during her career.
In 2008, the NHRA introduced a 1,000 foot (304.8 m) race distance, shortening the traditional quarter-mile distance, following the fatal crash of Funny Car driver Scott Kalitta. The FIA adopted this shorter distance in 2012, and the International Hot Rod Association followed suit in September 2017.
A Top Fuel engine is based on a second generation Chrysler RB Hemi, but built with exclusively specialized parts. The engine features a 500 cubic inch (8.19 L) displacement, with customary dimensions of a 4.1875-inch (106.36 mm) bore and a 4.5-inch (114.30 mm) stroke. The engine generates around 150 dB of sound at full throttle, requiring spectators to use ear protection. The engine uses a 14-71 type Roots supercharger, driven by a toothed belt, with manifold pressures typically ranging from 56–66 psi (386–455 kPa). Fuel is injected by a constant flow injection system, utilizing approximately 10 injectors in the injector hat, 16 in the intake manifold, and two per cylinder in the cylinder head.
Safety is a major concern in Top Fuel racing. The NHRA has implemented numerous safety regulations over the years, including mandating enclosed cockpits in 2012, limiting engine displacement, and requiring Kevlar blankets around the supercharger and clutch assemblies. Typical safety equipment includes full face helmets with HANS devices, multi-point safety harnesses, and fire-resistant suits.
The engine consumes between 12 and 22.75 US gallons (45.42–86.12 L) of fuel during a run, and is completely disassembled and examined after each lap for wear or damage. The engine block is machined from forged aluminum and lacks water passages, relying on the incoming air/fuel mixture and lubricating oil for cooling.
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