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A4 B5 In tank fuel pump

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April 30Apr 30

My 2.5 Tdi is suffering loss of power which I suspect is a faulty fuel transfer pump. An Audi Specialist gave ne a part number 8D0 906 087 AN which seems to be okay. Unfortunately the pumps on Ebay vary in outlet pressure from 0.5 -3.4 bar. Can anyone advise me on the correct pressure please?

April 30Apr 30

Could it be an issue with the high pressure fuel pump?

If so, you'll need to keep the module as it's part of imobilser system. Or it is on the A6 c5.

April 30Apr 30

Author

It is an A4. Car runs but struggles to get above 60mph

May 6May 6

On 4/30/2026 at 11:41 PM, MichaelS said:
It is an A4. Car runs but struggles to get above 60mph

Sorry I was referring to similarities to my experience and knowledge of the A6 c5 which is similar. It's the c5 I've got.

Have you got any further?

Could it be an issue with the turbo?

Have you had a diagnostic check to see if any fault codes flag up?

May 14May 14

Author

Tested the fuel pressure it is zero. Can't find the correct pressure for a replacement pump 0.5bar or 3.2bar.

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A4 B5 In tank fuel pump

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Topics

Engine / ECU to Injector wiring loom

Are S5's notorious for not being serviced?

New 226 audi q3

Running boards 2024 black petrol standard model

C5 RS6 034 strut top mount

Help with some issues

Wing mirrors don't fold out when unlocking the car.

Park My A3 without having brakes on

A3 uncommanded engine shutdown

Audi A1 coil packs

Central locking

GEARBOX MALFUNCTION YOU CAN CONTINUE DRIVING

A% front suspension groan

Any ideas on what this sound could be? Audi A3 8P

Does anyone know what this high pitched noise is?

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