Toyota Tundra 2001-06

Fuel Injectors

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Removal & Installation



3.4L Engine


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Fig. Fuel injector arrangement and related components-3.4L engine



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Fig. Install new O-rings and grommets on each injector-3.4L engine

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Depressurize the fuel system.
  4.  
  5. Remove or disconnect the following:

    Air cleaner hose
     
    Upper half of the intake manifold
     
    Fuel pressure regulator
     
    Fuel inlet pipe
     
    Fuel injector electrical connections
     
    Fuel rail with the injectors
     
    Spacers from the intake manifold
     
    Injectors from the delivery pipes
     
    O-rings and grommets, discard them
     

  6.  

To install:

  1. Install or connect the following:

    New grommets and O-rings on each injector, lubricated with a light coat of gasoline
     
    Fuel injector with the electrical connector facing outward
     
    Spacers on the intake manifold
     

  2.  
  3. Temporarily install the bolts to hold the delivery pipes to the intake manifold.
  4.  
  5. Check that the injectors rotate smoothly. If they do not, the O-rings have probably been installed incorrectly.
  6.  
  7. Install or connect the following:

    Fuel injector electrical connectors
     
    Fuel pipe with new gaskets. Tighten the bolts to 25 ft. lbs. (34 Nm) and the delivery pipes-to-intake manifold bolts to 10 ft. lbs. (13 Nm).
     
    Fuel pipe union with new gaskets. Tighten the clamp bolt to 71 inch lbs. (8 Nm).
     
    Fuel pressure regulator
     

  8.  
  9. Inspect the vacuum lines and connections. Look for any loose connections, sharp bends or damage.
  10.  
  11. Install or connect the following:

    Air cleaner
     
    Air cleaner hose
     

  12.  
  13. Start the engine and check for vacuum and fuel leaks.
  14.  

4.7L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Engine appearance cover
     
    Air intake tube
     
    Fuel lines
     
    Fuel pulsation damper
     
    Fuel pressure regulator vacuum line
     
    Accelerator cable and bracket
     
    Positive Crankcase Ventilation (PCV) valve and hose
     
    Evaporative Emissions (EVAP) vacuum switching valve
     
    Engine appearance cover brackets
     
    Fuel injector harness connectors
     
    Engine harness protector
     
    Fuel supply manifold crossover pipe
     
    Fuel supply manifolds with injectors attached
     
    Fuel injectors
     

  6.  

To install:

  1. Install the fuel injectors to the supply manifold with new O-ring seals and new grommets.
  2.  
  3. Install new injector insulators to the intake manifold.
  4.  
  5. Install or connect the following:

    Fuel supply manifolds with injectors attached. Tighten the bolts to 66 inch lbs. (7.5 Nm).
     
    Fuel supply manifold crossover pipe. Tighten the bolts to 29 ft. lbs. (39 Nm).
     
    Engine harness protector
     
    Fuel injector harness connectors
     
    Engine appearance cover brackets
     
    EVAP vacuum switching valve
     
    PCV valve and hose
     
    Accelerator cable and bracket
     
    Fuel pressure regulator vacuum line
     
    Fuel pulsation damper
     
    Fuel lines
     
    Air intake tube
     
    Engine appearance cover
     
    Negative battery cable
     

  6.  
  7. Start the engine and check for leaks.
  8.  

 
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