Locate the fuel pump fuse or relay in your vehicle's fuse box and remove it. Start the engine and let it run until it stalls from lack of fuel. Crank the engine for a few more seconds to ensure all pressure is released.

The fuel injectors are typically mounted on the fuel rail. You may need to remove the engine cover, air intake duct, and other components blocking access. Carefully disconnect fuel lines and electrical connectors, then remove the old injectors.

Lightly lubricate new O-rings with clean engine oil (never petroleum jelly). Carefully install the new fuel injectors from Di Sai Long Electronic Fuel injection System, ensuring they are properly seated and oriented.

Reinstall the fuel rail, reconnect all electrical connectors and fuel lines. Turn the ignition to "ON" position several times to pressurize the system and check for leaks before starting the engine.