In the event of an airbag deployment in a frontal or side collision, a fuel cut-off mode is provided with the fuel pump turned off.
To improve maintainability, the fuel line is connected to the fuel hose using a quick-release coupling.
The small fuel pump includes a fuel filter, a pressure regulator and a fuel level sensor.
To improve mixing (fuel spray) the 1ZZ-FE engine uses 12 injectors, while the 3ZZ-FE engine uses 4 injectors.
Pic. 2.23. Fuel system components for 1ZZ-FE and 3ZZ-FE engines
Maintenance recommendation
The two types of injectors have different tolerances for fluctuating static fuel injection rates. The injected fuel consumption is indicated by the color of the identification plate on the 1ZZ-FE engine or by the color code on the 3ZZ-FE engine.
When replacing injectors, a new set of 4 injectors with the same injection rate must be installed.
When replacing a part of a kit (1 to 3 nozzles) new injectors with the same identification plate or color code must be used.
When replacing a complete set of injectors, any injectors with the same identification plates or identical color coding can be installed.
Fuel system without drain line
Pic. 2.24. Fuel system without drain line
This type of fuel system was chosen to reduce the release of fuel vapor into the atmosphere. Figure 2.24 shows a fuel pump that includes a fuel filter, pressure regulator and fuel level sensor. Such a constructive solution eliminates the return of fuel from the engine to the tank and prevents an increase in the temperature of the fuel in the tank.
Fuel pump assembly
Pic. 2.25. Fuel pump assembly
The compact fuel pump includes a fuel filter, pressure regulator and fuel gauge. This design solution eliminates the return of fuel from the engine to the tank and prevents an increase in the temperature of the fuel in the tank (pic. 2.25).