How can you tell if your fuel pump is not working?

You can determine if your fuel pump is not working by noticing symptoms such as a lack of engine start, sputtering or stalling during acceleration, or a loss of power while driving. Additionally, if you hear a whining noise coming from the fuel tank or notice a drop in fuel pressure during a diagnostic test, these could indicate a malfunctioning fuel pump. Checking for fuel leaks or a faulty fuel gauge can also provide clues. If you suspect an issue, it's best to have a professional inspect the system.