Weird noise from fuel rail or injectors - Audi Forum - Audi Forums for the A4, S4, TT, A3, A6 and more!

Oct 23, 2025 | 04:12 PM

MajesticS6

Thread Starter

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Joined: Sep 2025

Posts: 2

Weird noise from fuel rail or injectors

Hello,
Does anyone know what this sound might be? I had to change an injector, so I took this chance to remove all my injectors and clean all the dirt and grime on them, but now when I prep the fuel pumps, it does this weird squeaky noise. I haven’t seen anything leak tho.

Dec 3, 2025 | 11:48 AM

hikoma

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Joined: Nov 2025

Posts: 20

Re: Weird noise from fuel rail or injectors

Quote:

Originally Posted by MajesticS6

Hello,
Does anyone know what this sound might be? I had to change an injector, so I took this chance to remove all my injectors 445110382 and clean all the dirt and grime on them, but now when I prep the fuel pumps, it does this weird squeaky noise. I haven’t seen anything leak tho.

https://youtube.com/shorts/p9OtLXep5ZY

The squeak is likely air trapped in the fuel system, or the pump working harder after reinstalling the injectors. If there are no leaks and the engine runs normally, it’s harmless and should stop once the system is fully pressurized.