Warning! Remember that gasoline is a highly flammable liquid! When working with fuel system components, observe all accepted fire safety measures. Do not smoke! Do not approach the work area with an open flame or an unprotected portable lamp! Do not service the system in rooms equipped with heating devices operating on natural gas and equipped with a pilot flame (such as water heaters and clothes dryers). Do not forget that gasoline is a carcinogen, i.e., a substance that promotes the development of cancer! Try to avoid fuel coming into contact with exposed areas of the body, use rubber protective gloves, and in case of accidental contact with fuel, wash your hands thoroughly with warm water and soap. Collect spilled fuel immediately and do not store fuel-soaked rags near open flames. Remember that the fuel system of models equipped with fuel injection is constantly under pressure. Before disconnecting the fuel lines, release the residual pressure in the system. Wear safety glasses when servicing fuel system components. Always keep a class B fire extinguisher at hand!
1. Remove the fuel pump fuse from the fuse box located in the vehicle interior (see Chapter On-board electrical equipment).
2. Start the engine and wait until it stops spontaneously. To ensure complete discharge, turn the engine over with the starter a few more times. Disconnect the negative cable from the battery.
Warning! If the car stereo system is equipped with a security code, make sure you have the correct combination to activate the audio system before disconnecting the battery!
3. After completing servicing the power system, reinstall the fuse and connect the negative cable to the battery.
(Information copied from the portal nissanbook.ru)
4. When disconnecting the fittings, they should be covered with paper towels to collect any spilled fuel.