Have a problem. Need help.
 

I have a 1989 300E that has been sitting for a little while; I got a new battery and the car doesn't seem to start. It turns over but doesn't start. I have replaced the fuel filter and now think that the problem is either the fuel pump or the fuel pump relay. I am pretty sure that the fuel pump SHOULD be heard when the key is turned; however, I just don't hear anything when I turn the key other than the engine trying to start. Is there any way I can figure out whether I need a fuel pump or a relay? Is there any other problem it could be? Should I hear the fuel pump? Thanks to all who answer.