Chery A18. Manual — part 43

10. Electric power balance:

Normal working of electric components (front light, heat back window, etc.) will make
battery voltage lower than 12.2V, electric components power demanded in that time is larger
than electric power from generator. That is to say, negative “electric power balance” may
cause damage to battery. In that condition, ECU accelerates idle speed step by step (from 800
r/m to 1200 r/m) to make adequate electric power from generator. Accelerating idle will
disappear when “electric power balance” is positive.

Fuel supply system of this vehicle is belonging to “half no scavenge fuel”, there is only one
tube connecting fuel tank and fuel rail.

This system has advantages below:

- When accident occurs, no scavenge fuel tube can lower fire possibility to minimum.

-There is comparative less fuel vapor in fuel tank.

- Fuel temperature in fuel tank is lower.

FUEL SYSTEM WORKING COMPONENTS

Fuel Injection Volume Inspection

Warning：

·Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious

injuries or death and damage. Always carry out the following procedure with the
engine stopped.

Note

·If there is an after market fuel injector tester, perform the following test.

·If there is no an after market fuel injector tester, perform “Operation Test”,

“Resistance Inspection”, and “FUEL Leakage Test”to verify the fuel injector is
ok or not.

1．Complete the “Before repair procedure”

2．Disconnect the negative battery cable.

3．Remove the fuel injectors.

4．Connect the fuel injector to the fuel injector tester.

5．Measure the injection volume of each fuel injector using a graduated container.

Working pressure: 350kpa

Working temperature: －30℃～＋110℃

6．Turn the ignition switch to LOCK position

and disconnect the jumper wire.

7．Complete the “After repair procedure”.

Atomization

1．Inspect atomization pattern.

·If the atomization is faulty, replace the fuel injector.

Half no scavenge fuel supply integrated module

Fuel supply module is in fuel tank, which includes:

- Fuel pump;

- Diaphragm type fuel pressure adjuster;

- Fuel filter (out of the fuel tank)

1.Fuel Supply Module 2.Fuel Filter 3.Fuel Rail 4.Fuel Injector 5.Pressure Regulator

6.Cone Way Valve 7.Fuel Pump 8.Primary Filter 9.Injection Pump

Fuel pump

Fuel pump inspection

Note

·When ignition switch is at ON position, it is normal to hear the sound of fuel pump

running.

Fuel pump is located in fuel tank, and there is netlike filter in the fuel pump entrance. Internal
gear positive displacement fuel pump should use unleaded gasoline. Rotor is driven by motor,
while motor power comes from battery through relay.

There is safety valve installed in fuel pump. Safety valve will open to prevent engine from
over hot when pressure in fuel line is over 7bar.

Fuel pump can work in fuel temperature range of -30 ~ +70℃. Minimum rate of flow is 76

l/h on 4bar-12V(maximal current is 8.5A), while minimum rate of flow is 20 l/h on 3bar-8V.

1.Electric Terminal 2 Fuel sucking Slot 3.Fuel transporting Groove 4.Safety Valve

ECU realizes below control to fuel pump through relay:

- Fuel pump works as key switch is on for 2 seconds but engine does not start.

- Fuel pump keeps working when engine is running or vehicle is in its way.

Fuel pump will stop working if engine speed is lower than a certain value (approx.50r/m).
Remained fuel can prevent disturbance of static and electric wave. Fuel continuously flowing
can cool fuel pump and clean fuel rail.

Fuel Pump Hold Pressure Inspection

Warning

·Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries

or death and damage. Always carry out the following procedure with the engine
stopped.

Caution

· Disconnecting/connecting the quick release connector without cleaning it may

possibly cause damage to the fuel pipe and quick release connector. Always clean
the quick release connector joint area before disconnecting/connecting using a cloth
or soft brush, and make sure that it is free of foreign material.

Fuel Pump Hold Pressure Inspection

Warning

·Fuel line spills and leakage are dangerous. Fuel can ignition and cause serious

injuries or death and damage. Always carry out the following procedure with the
engine stopped.

Caution

·Disconnecting/connecting the quick release connector without cleaning it may

possibly cause damage to the fuel pipe and quick release connector. Always clean
the quick release connector joint area before disconnecting/connecting using a cloth
or soft brush, and make sure that it is free of foreign material.

Fuel pressure regulator

Fuel pressure regulator is located in fuel tank, which is specified on fixed pressure of 3.5bar.

Caution

·Due to adoption of the mechanical returnless fuel system, the pressure regulator

cannot be inspected separately.

Fuel rail
Fuel rail 1 is made of cast aluminum. Its function is distributing fuel to injector 2.