Chery automobile Service Manual page 106

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
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.
2 Fuel sucking Slot
F-23
3.Fuel transporting Groove 4.Safety Valve