Most of them have a low pressure regulator built into them. When the pressure hits a specific threshold, the circuit to the pump is interrupted. If you are out of fuel or low on fuel - your pump should continue to run as long as power is applied.
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GT40 RCR40 #45 G50-331-Weber IDAs
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Sounds like you have wired it to a live source or the live side of the key- best you change that so it only works when the key is on, dont want to end up in ditch or trapped in the car with fuel being pumped everywhere because you cannot reach the switch.
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Jac Mac
My old Yamaha FZR1000 bike had one of these after a period of time the pump would stop regardless of whether there was pressure or not(10 seconds roughly), which thinking about it now would be a good safety feature for the use of such a pump on a car
If you want to add some real safety, add a low pressure cutout switch like the one below. Most of the speed shops have them. It essentially cuts power to the fuel pump or ECU(your choice) when a preset pressure is met. They are anywhere from about 7 psi to 12. The third lead can go to a low pressure light for warning. This could be added in series to an inertia switch. A bypass button can be added to do just that for cranking. It also add a safety feature, in that if someone doesn't know about it, they can't crank it. Read steal it.
Bill
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