The fuel filter traps debris that could clog or damage the fuel injectors or engine. Fuel filters are usually located in the fuel line where it meets the fuel injection system at the engine or just in front of the rear wheels attached to the frame, but some cars use a filter only in the fuel tank itself. Manufacturers usually set a replacement interval for fuel filters, though the period can vary widely. A clogged filter can occur at any time, however, and can result in a check engine light or rough engine performance.
