Intallation examples of electric fuel pumps illustrated in block diagrams
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Information on diagnostics
What is the difference between in-line pumps and in-tank pumps? When are pre-feeder pumps needed? What are the different installation options for electric fuel pumps? This article tells you all you need to know.
We distinguish between in-tank and in-line pumps, depending on how the fuel pump is installed in the vehicle.
Mixed and special systems, such as semiin- tank pumps (e. g. in the Golf II), are not described here.
One or two fuel pumps are connected in series, depending on requirements.
These installation options are illustrated in the adjacent diagrams
- In-line pumps are inserted in the fuel line.
- In-tank pumps are installed in the fuel tank. In the case of in-tank pumps, other components, such as fluid-level sensors or diagnostic systems, can be installed directly in or on the pump module.
Mixed and special systems, such as semiin- tank pumps (e. g. in the Golf II), are not described here.
One or two fuel pumps are connected in series, depending on requirements.
- A single fuel pump
- Two fuel pumps (pre-feeder pump, main pump) Pre-feeder pumps deliver the fuel to the main pump under low pressure
- A single two-stage fuel pump
These installation options are illustrated in the adjacent diagrams