Which is why you must turn the ignition off if you have a crash. If the fuel line is rupture you can get loads of fuel outside the relative safety of the fuel tank rather quickly
Of course, I have a battery isolator switch as well, as the car is used for competitions. Another safety device sometimes used is to wire in an engine oil pressure sensing switch. This will not allow the live feed to connect to the fuel pump unless the oil pressure is up. If you fit one of those you also need a fuel prime (bypass) switch to get the fuel system filled to start the car, but the pump will stop running as soon as the engine stops turning.