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The fuel pump will only run for 2 seconds with each key-on if the engine is not also running. You will have to connect a wire directly from the battery to the pump or relay in order to keep it running.
When in operation, the fuel pump runs continuously, so as long as there is fuel in the tank, it is being cooled. If you wanted to do this, you need to make sure to turn it off as soon as its starts running dry to prevent the pump from burning out. For safety's sake, make the disconnection as far away from the fuel area as possible. Electromagnetic devices will produce their biggest spark when their supply current is being disconnected. Pumping fuel in the open will generate fumes, and even a little spark can set them off.
Depending on the configuration of the tank, or where the pump/sender mounting is located, you may not have to drain all the fuel out to get at them. I was able to service the mounting plate for the pump/sender on my Aerostar tank with the tank about half empty. I tilted the outside half of it down enough to get at the plate after loosening the mounting straps.
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