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On the 335i there is the regular (to other E90s with N52s) low-pressure fuel pump/filter unit that is located in the fuel tank. The circular parts (no. 5 in the diagram) are just new caps that hold the fuel pump/filter unit and the pressure regulator unit in place in the fuel tank. On the 3-series, the fuel tank is located under the rear seat and can be accessed through the floor by removing the rear seat bottom cushion and removing the access covers built into the floor. The design is this way so you don't have to drop the tank to repair the fuel pump.
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