Electric Fuel Pump-On a Timer?????

[jim16671836]

I have a 1974-450-SLC and the fuel pump comes(for about 2-3 seconds) on each time the key is activated. then the pump shuts off. I laid under the car and listened and the pump did exactly the same thing time after time...I had just dismantled the pump and cleaned it because it had been idle for some time....it is almost like a timer is hooked to the electric fuel pump....thanks Jim