Chery QQ6 Service Manual download pdf (Page 16)

8. Fuel Pump Assembly

8.1 Function of fuel pump:

Fuel pump is used to deliver the fuel in the fuel tank to inside the engine at a certain pressure

for combustion. It also needs to regulate the fuel pressure duly as required by system pressure (non

fuel return type). Generally, the system fuel pressure provided by fuel pump is around 3.5-4bar.

8.2 Operating principle of fuel pump:

The electrical fuel pump is comprised of the DC motor, vane pump and end cover (integrates

check valve, relief valve and anti-electromagnetic interference element) as shown in following

figure.

The pump and the motor are installed on the same shaft within same closed housing. The pump

and electromotor are full of gasoline for coolant and greasing inside of the casing. The accumulator

provide power to electric fuel pump via fuel pump relay, and the relay switches on electric fuel pump

only when engine starting and running. When the engine stops for some reason, the pump will stop

to run by itself.

The max pressure at the outlet of the electrical fuel pump shall be between 450 and 650 kPa,

depending on the relief valve. Because the system is a non fuel return system, the pressure of the

whole fuel system will be controlled by the fuel pressure regulator. The value is 400KPa in general.

The electric fuel pump has different flow to the engine’s request. In order to facilitate the

production, the electromotor revolutions of EKP13 series electric fuel pumps of the same structure

are adjusted by changing the coil’s number of turns, and thus the flow is adjusted. Therefore, do not

apply an electric fuel pump for one model to another at will.

8.3 Parameters of technical features

Under certain fuel supply pressure, the flow of the electric fuel pump is in direct proportion to

voltage. The fuel pumps used by complete vehicle manufacturers are different.

8.4 Installation attentions

EKP13 series electric fuel pump can only be used inside fuel tank. When installing the fuel

pump, the filter net at fuel inlet with mesh size not bigger than 60µ or arranged with the customer

must be installed. Be careful not to let the fuel jet from air vent spray on the filter net at fuel inlet,

fuel pump bracket or fuel tank wall. Be careful when carrying the fuel pump. First, be sure to protect

the filter net at fuel inlet from load and impact. The fuel pump should be taken out of the plastic

1. End cover of oil pump

2. Electromotor

3. Oil passage

4. Paddle pump

Cross-section view of electric fuel pump

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Chery QQ6 Service Manual Page 16