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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Kia Sephia / Shuma (1995 release)

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Kia Sephia / Shuma
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Kia
Sephia / Shuma
Maintenance
Engine
Greasing system
Cooling
The power supply system and release
Fuel system
Technical data
Removing the pressure in the fuel system
Activation of the fuel system
Check of residual pressure in the fuel system
Check fuel lines
Fuel pump
Check the maximum pressure created by the pump
Checking the fuel pump relay
Checking the fuel injector
Check of tightness of fuel atomizers
Checking the fuel injector
Check of resistance of fuel atomizers
Fuel tank
A fuel supply unit
Pressure regulator
Fuel lines
Tube neck toplivonalivnoy
Fuel filter
Quick connections
Fuel line
Fuel injectors
Ignition system
Coupling
Manual transmission
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Fuel system



Fuel system

1 - the fuel return pipe;
2 - the fuel line;
3 - a fuel filter (high pressure);
4 - the fuel injector;
5 - a pressure regulator;
6 - a fuel supply unit;
7 - pulsation damper (only on engine TED);
8 - the fuel tank;
9 - Cover toplivonalivnoy neck;
10 - toplivonalivnaya neck;
11 - line (to the injectors)

Conventional system

In most fuel systems, more than 90% of the fuel in the fuel tank returns to its normal operating mode.
The temperature of the fuel returned to the fuel tank rises to 7-15 ?� C due to the fact that it is heated up under the vehicle and near a hot engine, as well as by the internal friction and wall friction pipelines.

Continuously warmed return fuel increases the temperature of the fuel in the tank.

At the same time, fuel is compressed to a pressure of 320-350 kPa in the fuel line, passing through the pressure regulator to the fuel tank under low pressure.

In this case, vaporization of the fuel is increased with respect to elements having a lower evaporation and vapor fuel received in the fuel tank.

Fuel vapors from the fuel tank into the atmosphere through the fuel vapor recovery system.

Systems with low fuel return

Installed on vehicles, in which there is no fuel return pipe from the engine to the fuel tank.

The pressure regulator mounted within the fuel tank and reducing the length of the fuel return conduit, reduces the evaporation of fuel on 60-20% in relation to conventional fuel system.

In addition, installing a jet pump fuel supply unit supplies fuel to the pump, ensuring a stable supply of the fuel at low fuel level in the tank. The system provides a steady supply of fuel at inclinations of a vehicle at low fuel level in the tank.

A fuel supply unit

A fuel supply unit is installed in the fuel tank and consists of the following components and assemblies:

- A fuel pump with an electric drive;
- Pressure regulator;
- The fuel filter;
- Fuel level sensor;
- Fuel.

Fuel pump

Fuel pump with an electric drive is installed in the fuel tank with the fuel level sensor. The fuel pump control is performed by the control unit of the engine through the fuel pump relay.

The fuel pump supplies fuel through pipelines under pressure to the fuel line and the injectors. The pressure in the fuel line is maintained even when the fuel pump is not running, due to one-way valve located near the fuel pump.

The fuel pressure regulator and injectors

The pressure in the fuel system is regulated by a pressure regulator.

Supply voltage to the injectors from a battery via the main switch. The amount of fuel fed into the intake tract of the engine is determined by the duration of pulses generated by the engine control unit and supplied to the injectors.

Fuel Level Sensor

The fuel level sensor consists of a float mounted on the lever and a variable resistor. If you change the position of the float is proportional to the resistance change of the variable resistor. On the basis of the signal from the fuel level sensor, fuel gauge in the instrument cluster shows the amount of fuel in the tank.

Fuel pipes and hoses

Fuel pipes and hoses allow the transfer of fuel from the fuel tank to the fuel lines and injectors and return excess fuel to the tank. Fuel lines attached to the bottom of the car must be periodically inspected for dents and deformation as due to narrowing of the passages may limit the flow of fuel.

Fuel pipes and hoses also ensure the transfer of fuel vapors from the fuel tank to the canister with the activated coal, where they are going with the engine off. After engine start-up and warm up to operating temperature, the engine control unit opens the solenoid valve and the fuel vapor from the canister into the engine and burned.

Fuel line

Fuel line supplies fuel to each nozzle and mounted on the intake manifold.

At the moment, the fuel pressure regulator is not located on the fuel line, and is installed in the fuel tank.

On the fuel line is the service valve, which serves to remove the air after maintenance of the car or start the engine.





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