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A6 Fuel pump noisy


Jase1
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Hello,

I have a 2019 A6 (C8) avant with the 40tdi engine. My car does a irritating humming/buzzing sound which at first i thought to be from an unbalanced AC fan but soon discovered its not as i turned the AC off, the humming persisted. I had also noted that this noise changes in tone when slightly pressing the accelerator, so it is connected to fuel supply to the engine.  I have recently discovered its source when I began using the start-stop function (which i did not used), as when the engine is stopped as i stop in traffic, the noise can be clearly heard (without beeing masked by engine noise) for 1-2 secs and then it stops to reappear again as soon as engine starts. It is clearly a pump noise and it is located under the passenger seat (my car is LHD).

before this A6 I had a Q5 and the fuel filter was located under the passenger seat but had no pump. Maybe Audi moved the primary pump to this location or set a new pump on the fuel circuit, as there is also one pump on the tank (I car hear that too). I could not find any service manual or diagrams for this car, so I cannot tell for sure.

I did not take the car to the dealer but i am planning on do it soon as this noise drives me mad.

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  • 2 weeks later...
On 1/22/2020 at 11:39 PM, Francisco said:

Hello,

I have a 2019 A6 (C8) avant with the 40tdi engine. My car does a irritating humming/buzzing sound which at first i thought to be from an unbalanced AC fan but soon discovered its not as i turned the AC off, the humming persisted. I had also noted that this noise changes in tone when slightly pressing the accelerator, so it is connected to fuel supply to the engine.  I have recently discovered its source when I began using the start-stop function (which i did not used), as when the engine is stopped as i stop in traffic, the noise can be clearly heard (without beeing masked by engine noise) for 1-2 secs and then it stops to reappear again as soon as engine starts. It is clearly a pump noise and it is located under the passenger seat (my car is LHD).

before this A6 I had a Q5 and the fuel filter was located under the passenger seat but had no pump. Maybe Audi moved the primary pump to this location or set a new pump on the fuel circuit, as there is also one pump on the tank (I car hear that too). I could not find any service manual or diagrams for this car, so I cannot tell for sure.

I did not take the car to the dealer but i am planning on do it soon as this noise drives me mad.

Hi,

Thanks for the note, It looks like Audi are going to install a new fuel pump, it is on back order but the service technician said it looks like they are changing the pump design due to the noice. My car is booked in again for the 10th Feb and they want it for a week!

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  • 2 years later...

Hi I have  the same problem with this pump ... it makes me  crazy 🤪 😜 😫  how do you think they will replace this option .. ? I'm in Greece... please write when you ha e some news 

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5 hours ago, Emmanouil said:

Hi I have  the same problem with this pump ... it makes me  crazy 🤪 😜 😫  how do you think they will replace this option .. ? I'm in Greece... please write when you ha e some news 

I'd be contacting your local Audi dealer as it sounds like they're changing them under warranty. 

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  • 3 months later...
On 1/22/2020 at 11:39 PM, Francisco said:

Hello,

I have a 2019 A6 (C8) avant with the 40tdi engine. My car does a irritating humming/buzzing sound which at first i thought to be from an unbalanced AC fan but soon discovered its not as i turned the AC off, the humming persisted. I had also noted that this noise changes in tone when slightly pressing the accelerator, so it is connected to fuel supply to the engine.  I have recently discovered its source when I began using the start-stop function (which i did not used), as when the engine is stopped as i stop in traffic, the noise can be clearly heard (without beeing masked by engine noise) for 1-2 secs and then it stops to reappear again as soon as engine starts. It is clearly a pump noise and it is located under the passenger seat (my car is LHD).

before this A6 I had a Q5 and the fuel filter was located under the passenger seat but had no pump. Maybe Audi moved the primary pump to this location or set a new pump on the fuel circuit, as there is also one pump on the tank (I car hear that too). I could not find any service manual or diagrams for this car, so I cannot tell for sure.

I did not take the car to the dealer but i am planning on do it soon as this noise drives me mad.

Did you get this sorted? I got  2019 a6 a few weeks ago from dealers and this noise is driving me mad! Thanks

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8 minutes ago, fiz said:

Did you get this sorted? I got  2019 a6 a few weeks ago from dealers and this noise is driving me mad! Thanks

If bought within 30 days get it back to them asap as they have to fix it for you as you're entitled to a full refund up to 30 days. If it's over 30 days then speak to Audi if you're luck is on your side and have some manufacturers warranty left. 

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I do have 2 years warranty, been around Europe done around 1700miles, before I picked the car up I did notice it slightly and mentioned it to them to have it fixed for when I picked it up, when I did go back the guy said something like it will go away (I just thought maybe it's been parked up a little while so will stop after a little bit of driving) but it's definitely not stopped and is still constant, exact same as Francisco above has

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13 hours ago, fiz said:

I do have 2 years warranty, been around Europe done around 1700miles, before I picked the car up I did notice it slightly and mentioned it to them to have it fixed for when I picked it up, when I did go back the guy said something like it will go away (I just thought maybe it's been parked up a little while so will stop after a little bit of driving) but it's definitely not stopped and is still constant, exact same as Francisco above has

That's not on, usually these things don't just go away in my opinion. 

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