After changing a fuel filter, it's important to check for leaks, prime the fuel system, start the engine, and test drive the vehicle. Checking for leaks involves visually inspecting the area and looking for any signs of fuel or using a fuel leak detection kit. Priming the fuel system may be necessary in some vehicles to build up fuel pressure in the system. Starting the engine and letting it run for a few minutes can help ensure that the fuel filter is working properly and that there are no issues with the fuel system. Taking the vehicle for a short test drive can help identify any problems with acceleration or power, which may indicate that there is still an issue with the fuel system that needs to be addressed. It's important to refer to your vehicle's owner's manual for specific instructions on how to change the fuel filter and any other maintenance procedures.