Article: Now that there is no reason for the engine to be started again until the project is complete, you should disconnect the negative terminal on the battery.  Removing the cable from the negative terminal will prevent the engine from being started while you work.  You will need to use a hand or socket wrench to loosen the nut holding the cable onto the negative terminal, but you will not need to remove the nut completely.  Disconnecting the battery will ensure the engine cannot be started during the remainder of this project. Tuck the negative cable to the side of the battery to ensure it doesn’t accidentally come into contact with its terminal on the battery. There are two common locations fuel filters are mounted in vehicles, so you should refer to your vehicle’s service manual to help you determine which place to look.  The most common location for modern vehicles is along the fuel line on the bottom of the car, just past the fuel pump.  In some vehicles, the fuel filter is located in the engine bay on the line that leads to the fuel rail.  Some vehicles may place the fuel filter in a different location, so refer to your service manual to find out for sure. You may need to access the fuel filter from inside the cabin of some vehicles. If the fuel filter is located on the underside of your vehicle, you will need to jack up the car to access it.  Slide the jack under the car at one of its designated jack points, then either pump or twist the handle to raise the vehicle (depending on the style of jack).  Once the vehicle is jacked up, place jack stands beneath it before working under the vehicle. Never rely on a jack to support the weight of a vehicle you are beneath while working. Although you relieved the pressure in the fuel line, there may be a bit of fuel left in the line that can spill out when disconnected from the fuel filter.  Place a bowl or bucket beneath the fuel filter to catch any fuel that drips or pours out.  Do not mix the fuel with oil or coolant to be recycled.  Gasoline should be held in its own container until it can be dropped off to a recycling location. Be careful of using plastic containers to hold gas, as it may eat through some kinds of plastic and cause a leak.
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Disconnect the battery. Locate the fuel filter. Jack up the car if necessary. Place a bowl or bucket beneath the fuel filter.