Things You'll Need
Fuel injector kit
Socket wrench set
How to Replace a Fuel Injector in a Toyota Tundra. The fuel injector in a Toyota Tundra mixes fuel with air under pressure and rendered carburetors obsolete during the late 1980s. A fuel injector has programmable firmware that allows the same hardware to handle different fuels. The fuel injector consists only of a nozzle and valve; it still requires a pump to deliver fuel into the engine.
Determine which fuel injector your Toyota Tundra will need. This depends not only on the make and model, but also the engine size. Models made from 2005 to 2006 offer options for a 4.0L or 4.7L engine. The current version is available with 4.0L, 4.7L and 5.7L engines.
Relieve the fuel system pressure and disconnect the negative battery cable with a socket wrench. Drain the engine coolant and remove the V bank cover.
Remove the air cleaner assembly and the intake manifold with a socket wrench. Disconnect the fuel lines and plug them to prevent leaking.
Disconnect the fuel injector electrical connectors and use a socket wrench to remove the six mounting bolts for the fuel rail. Lift the fuel rail away from the engine compartment with the injectors still attached. Pull the fuel injectors out of the fuel rail and discard the old gaskets and O-rings.
Install the new fuel injectors by reversing the removal procedure. Use new gaskets and O-rings, and fill the cooling system with coolant of the proper grade and type.
Start the engine and check for fuel leaks.