2001 Mercedes-Benz C320 Q&A

2001 Mercedes-Benz C320 Question: Gas gauge only goes to 3/4 and after 100miles an empty alarm comes on ???

I find only 5 gallons fills the tank again....Any thoughts...?? -
Answer 1
sender from tank not working. could be sticking or cracked. but not working. have to change it. -
Answer 2
Fuel level sender (Gas level float) has failed and needs replaced. -