No, running lean does not necessarily mean you have to change the fuel filter. Running lean refers to an air-fuel mixture that has less fuel than the ideal ratio, causing the engine to operate with insufficient fuel. A dirty or clogged fuel filter can restrict fuel flow and cause the engine to run lean; however, running lean can also be caused by various other factors such as a faulty oxygen sensor, vacuum leaks, or issues with the fuel injection system.
If you suspect that your engine is running lean, it is important to properly diagnose the cause before determining whether replacing the fuel filter is necessary. Simply replacing the fuel filter may not resolve the underlying issue and could be an unnecessary expense. It is recommended to consult a qualified mechanic or conduct further diagnostic testing to identify the root cause of the lean running condition.
