The recommended replacement interval for fuel filters varies depending on their structure, performance, and intended use, and cannot be generalized. Most automakers recommend a replacement interval of 48,000 km for normal maintenance of their external filters, and 19,200 to 24,000 km for conservative maintenance. If you are unsure, consult your vehicle's owner's manual for the correct recommended replacement interval.
Also, if the filter hose becomes degraded or cracked due to dirt, such as mud, dust, or engine oil, it should be replaced promptly.
