how do I get to fuel pump to test it or repair it 2000 mercedes sedan s500? on 2000 Mercedes-Benz S500

I need to test the power to the fuel pump and test the fuel pump to assure it is working. How do I get to it? Do I have to drop the gas tank or can I get to it from the floor board? It's a 2000 mercedes sedan S500.

Asked by for the 2000 Mercedes-Benz S500
Find where the relay is and test it there, the fuel pump should be in the tank.