high pressure pump a4 tdi-take a look-

[vw754]

where is this high pressure pump located on the audi a4 tdi (b6)
also if it's not working properly what are the symptoms?

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[golisago]

When you say high pressure pump do you mean the lift pump thats located in the tank area.....if this goes or going i would think you may have some shuddering , black smoke , and bad mpg.