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Mercedes-Benz in-tank module

4 installation situations in Mercedes CLS-Class and E-Class

Pierburg | Motorservice

Where are the fuel delivery modules in the Mercedes CLS-Class and E-Class vehicles? Where is the fuel tank sender unit located and how do you replace it? Why does the return line only have one connection point? Can the fuel tank sender unit and the pump module be replaced individually or do they have to be installed together? And how does the mounting process work? This article gives you the answers.

Installation situation 1:

2:45 – 3:20

If the fuel delivery module has not yet been replaced, you will find the following installation situation:
the pressure line is connected directly to the fuel pump by a 90° quick connector. Both return lines are clipped into the fuel delivery module. The plug of the electrical line leading to the fuel tank sender unit is located behind the two return lines.

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Installation situation 2:

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3:20 – 4:00

If only the fuel delivery module is to be replaced.
Connect the quick connector to the straight piece of tubing on the fuel pump. Clip both return lines into the pump module. Insert the plug of the electrical line that leads to the fuel tank sender unit into the pump module.

Installation situation 3:

4:00 – 4:35

If only the fuel tank sender unit is to be replaced.
Insert the electrical plug of the fuel tank sender unit into the socket below the return line. Attach the pressure line with the 90° quick connector directly to the fuel pump.  Then clip the return line with the straight quick connector into one of the two available brackets on the pump module. 

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Installation situation 4:

3700

4:35 – 5:10

If both the fuel delivery module and the fuel tank sender unit are to be replaced.
Connect the pressure line with the 90° quick connector to the straight piece of tubing on the fuel pump. Clip the return line with the straight quick connector into one of the two available brackets on the pump module. Insert the plug of the electrical line that leads to the fuel tank sender unit into the pump module.

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Mercedes-Benz in-tank module

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