No, that is where the fuel comes from during use of your car. It is difficult to describe, but basically, the fuel passes through the strainer, and then along a hidden tube inside the tank, and then it exits the "tank" at that little contracting rubber hose connection.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).