Using this K&N fuel filter is easy. First, make sure your vehicle's engine is off and cool. Locate the old fuel filter and carefully remove it. Then, install the new K&N fuel filter in its place, ensuring it's properly tightened. As for maintenance, it's a good idea to check the filter regularly. If you notice a decrease in your vehicle's performance or fuel efficiency, it might be time to replace the filter. When handling the filter, be careful not to damage it. Also, always follow your vehicle's manufacturer's guidelines for fuel filter replacement intervals.