The vehicle uses a combined fuel pump module. It is used on both gasoline and diesel engine variants. The fuel pump module includes all the components necessary to control the fuel level and supply.
On petrol engines, the fuel filter is installed in the module. On diesel engines, an external fuel filter is used, which is located in the engine compartment. The module for diesel engines also differs in that the fuel pre-pump is not used for the Z 17 DTL and Z 17 DTH engines.
Fuel pump module design
The diagram below shows an approximate design of the fuel pump module. The fuel pump module contains components that do not apply to all engine configurations.
Fuel pre-supply pump
On the vehicle, the fuel pump module is accessed for service through an opening located under the rear seat in the floor panel. The rear seat cushion must be removed to access the opening.
Fuel pre-supply pump (roller pump)
The fuel pre-supply pump is installed in the fuel pump module. The purpose of the fuel pre-supply pump is to supply sufficient fuel at a certain pressure to the engine intake under all operating conditions. It consists of a cover with electrical connectors, a check valve and an outlet fitting. The cover usually also contains carbon brushes required for the operation of the electric motor and the interference suppression element.
Requirements for the operation of the roller pump:
- flow rate from 60 to 200 l/h;
- fuel system inlet pressure from 3.0 to 4.5 bar.
Special tool
A special tool is required to remove the fuel pump module. The special tool shown is KM 6391. Four guides are installed vertically into the existing fuel pump module guides 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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