The vehicle uses an integrated fuel pump module. It is used on both petrol and diesel engines. The fuel pump module includes all the components necessary to control the level and supply of fuel.
On gasoline engines, the fuel filter is installed in the module. Diesel engines use an external fuel filter located in the engine compartment. The module for diesel engines also differs in that the pre-fuel pump is not used for the Z 17 DTL and Z 17 DTH engines.
Fuel pump module design
The diagram below shows an example fuel pump module design. The fuel pump module contains components that do not apply to all engine options.
Fuel injection pump
On a vehicle, access to the fuel pump module for maintenance is provided through a hole located under the rear seat in the floor panel. The rear seat cushion must be removed to gain access to the opening.
Fuel injection pump (roller pump)
The fuel pre-supply pump is installed in the fuel pump module. The job of the fuel pre-supply pump is to deliver enough fuel at a certain intake pressure to the engine under all operating conditions. It consists of a cover with electrical connectors, a non-return valve and an outlet fitting. The cover usually also contains the carbon brushes necessary for the operation of the motor and the noise suppression element.
Requirements for the operation of the roller pump:
- flow rate from 60 to 200 l/h;
- inlet pressure in the fuel system from 3.0 to 4.5 bar.
Special tool
A special tool is required to remove the fuel pump module. The figure shows special tool KM 6391. Four rails are installed vertically into the existing rails of the fuel pump module to separate the module from the brackets and remove the assembly.
For better clarity, the module is shown removed from the vehicle.
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