Replace a fuel pump on a 1993 Chrysler Fifth Avenue

It sounds like a fuel line broke, most likely because it rusted through. The fuel pump is running otherwise you wouldnt see any fuel spewing out from under the car. Get under the car and see where the line broke. In most cases, you can replace the broken section of line and it will be fine.
To answer your question though, to replace the fuel pump, you will need to remove the fuel tank from the car, as the pump is attached to the sending unit inside the tank. To remove the tank, you will need to disconnect the fuel filler neck, the fuel lines, and unplug the electrical connector, then get a jack under the tank and remove the straps holding the tank in the car. Lower the jack and you will be able to access the top of the tank where the sending unit is located. Romove the lock ring holding it in, and remove it from the tank.