Chery A11. Manual — part 35

CAC Gasoline Engine Maintenance And Servicing Manual

95

If the pressure in the fuel tank (1) rises beyond the specified value, two-way check valve (2) will open

reducing the pressure in the fuel tank.
If necessary, the valve may open reversely to vent inward when the fuel tank is vacuumed.
—When the fuel level is at middle or low , when it exceeds a specified pressure, the multi-function valve
(4) will permit the fuel vapor to reach the charcoal canister (6) and be absorbed by the activated carbon
granule.
The operation when engine is running (figure. 155)。
Solenoid (7) is powered on by ignition switch and is controlled by the injection system ECU directly by
the following modes: When the valve is open, the vacuum in engine will suck the vapor collections in the
charcoal canister into the lower part of throttle valve. When powered off, the valve will close to prevent theλ
sensor from sucking the vapor when it doesn’t work.

8 fuel vapor recirculation solenoid valve (condensing chamber EC1)
the fuel vapor recirculation solenoid valve is designed to regulate the vapor volume(from the

charcoal

canister

) controlled by ECU. When the solenoid valve is

deenergize

d ,the valve closes.

Its operation is controlled by ECU as following:

·Under the starting condition , the solenoid keeps close

preventing the fuel vapor from richening the mixture until the
specified engine coolant temperature is reached.

·during engine’s running, ECU sends a square wave signal to

the solenoid. The signal is used to control the fuel vapor
recirculation valve by energizing or deenergizing it. By this way,
ECU controls the fuel vapor volume to intake manifold preventing
the mixture density from changing dramatically.

·under a specified working condition：

—— the throttle

valve is at idling position

—— speed is

lower than the specified

—— the solenoid does not function When the intake pipe

pressure is lower/ higher than the specified value, the solenoid

remains close to improve the engine performance.

—— fuel cut-off switch

the switch is located in the right side of driver. It will cut
off the fuel supply for the injection system by switching off
the ground wire for fuel pump..

Fig.155 solenoid

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CAC Gasoline Engine Maintenance And Servicing Manual

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1.fuel tank 2.fuel pump (submerged in fuel tank) 3. Filter screen prefilter (installed in the

inlet of fuel pump)

4.fuel filter 5.fuel delivery pipe 6.fuel injector(installed in the throttle valve)
7.pressure regulator 8.fuel return pipe
9.fuel recirculation check valve (stop backflowing ) 10.fuel cut-off switch

working principle：
The steel ball ,which is installed in the cone seat, is generally locked by the neighboring magnet attraction.
Under the specified accelerating load, the steel ball is released from the magnetism stillness and begins to
move up the cone seat with the travel of the movement depending on the cone angle .
a quick-release mechanism exists on the top of the ball. the mechanism circuit is closed under the
normal condition, . When the mechanism is stricken by the ball resulting in the position variation, it will vary
from the closed circuit(NC) to the opened circuit(NO) and cut off the ground wire of fuel pump
simultaneously.
For the impact from any direction of the three vertical directions, the switch will fuction under the
condition of more than the peak value: 12g which is equivalent to the working condition of 25km/h or so.
The switch may be reset by pressing the reset button. The reset button is protected by a flexible cover
(protecting the button from the influence from the external material and from the necessity of resetting ).
Warning: Touching the surface lightly. If fuel is smelt or fuel system leaking is present, do not turn on the
switch. The leaking area should be located first and recovered avoiding firing.
if leaking does not exist on the surface, it may be restarted. Press the button to restart the fuel pump.

Fig.156

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CAC Gasoline Engine Maintenance And Servicing Manual

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1. battery

8.5A ECU fuse

3.1# ignition coil (cylinder 1、4)

9.dual relays (A—ECU，B—fuel pump)

3.λsensor

11.fuel pump

4.fuel injector

12. fuel vapor recirculation solenoid

5.2# ignition coil (cylinder 2、3)

13.ECU

6.ignition switch

14.main ground wire of engine

7.25A system insurance

15.fuel cut-off switch

Relay of system power supply

Fig.157

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CAC Gasoline Engine Maintenance And Servicing Manual

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Fig. 158

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