TIAGO

1.2L REVOTRON ENGINE

FUEL SYSTEM COMPONENTS.

1. Injector

The injector used in this engine is a piezo injector.

This is controlled by the EMS ECU. The timing of

injection and quantity is controlled by the EMS

ECU. It operates at a pressure of 4 bar. It makes

multiple injections.

The piezo actuator is an electrically energized

device that acts similar to a solenoid but is much

more precise. A piezo actuator is a composition of

piezo discs, that when electrically energized,

cause the discs to deform resulting in an

expansion. This expansion results in a

longitudinal motion thus controlling the injector.

When energized, the piezo actuator pushes

downward against the valve piston. The piezo

actuator is returned to its non-energized state via

the ECU switching the polarity of the electrical

feed to the injector.

2. Fuel Rail

It is a fuel reservoir where the fuel is maintained

at a pressure of about 4 bar. The fuel is pumped

into it from the pump and gets delivered to the

injectors through the lines.

3. Fuel Filter

The Fuel Filter is a part of the filtration system.

The fuel filter is located under the body near the

fuel tank along the pipe carrying the fuel to fuel

rail, It is made up of an outer case and an integral

mount that holds a filter element with high filtering

capacity. It filters the fuel being deliver under

pressure by the fuel pump. This is essential for

ensuring fuel injection operation since the injector

is extremely sensitive to foreign particles in the

supply circuit. Since it cannot be disassembled, it

must be replaced as an assembly at the

recommended intervals.

4. Fuel Tank and Fuel Tank Unit

The Fuel tank assembly consists of the fuel tank

and the Intank pump. The fuel tank is used to

store the fuel. The Intank pump consists of float

and a sensor. Fuel level sensor assembly

provides the signal to indicate the fuel level in the

tank. As the float arm assembly moves with

respect to the fuel level in tank, resistance at

sensor varies accordingly.