Atascadero car accident todayThe most common problem that causes the fuel gauge to read incorrectly is a bad fuel sending unit. The fuel sending unit located in the gas tank to measure the fuel tank level. Some sending units are attached to the fuel pump assembly, while others are stand-alone units, but both are made up of...Solana yield aggregator2002 CLK.probably the fuel sending units under the car. they typically go bad after time. Is your fuel gauge going crazy? Does you car show only ¾ full after you fill it completely?