how do I reset my fuel sending unit? on 2002 Mercedes-Benz C240

I just replaced my fuel pump & filter. My gauge reads 1/2 full, but I'm out of gas... how do I reset this?

Asked by for the 2002 Mercedes-Benz C240
Guess you better re do your fuel pump, the sender is on the fuel pump module. It could be bent or maybe hung on something.
Ok, thank you. I checked the float & it moves freely. But not sure if its hung on anything
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2003 MERCEDES BENZ C240 STOPPED. COULDN'T GET NO GAS. HAD FULL TANK BUT GAS LIGHT CAME ON. I CHANGED THE FUEL PUMP AND FUEL FILTER STILL DOING THE SAME THING. WHAT ELSE COULD IT BE?