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tdi in tank fuel pump

Discussion in 'A3/S3/Sportback (8P Chassis)' started by tdi-man, Apr 7, 2010.

  1. tdi-man
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    tdi-man Active Member

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    any body any ideas what the pump in the tank does ? and what happens when they start going faulty ?

    thanks
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  2. Khufu
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    Khufu Active Member

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    It is a combined unit, part pump & part fuel level sender. It, well, pumps fuel to the engine LOL. Not sure, but I guess on a diesel it will prime a 2nd high presssure pump in the engine bay? A faulty pump often comes up with a vcds scan, also manifesting in missing or poor power/slower acceleration.
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