[HandOverFist]

"Pumps/Valves: Cars equipped with carburetor(s) or nonelectronic
fuel (EFI) systems but with mechanical non-OEM fuel
pumps must have a quick-action fuel-shutoff valve within easy
reach of driver and located in the main fuel line between the
fuel tank and the carburetor and/or injectors. Fuel recirculation
systems not part of normal fuel/pump system prohibited. All
cars in Stock, Super Stock, Competition, and Pro Stock must
be equipped with a positive-lock drain valve located between
the fuel tank and the carburetor(s) or fuel injector to facilitate
removal of fuel samples for fuel-check purposes."