[Do_Will]

Oops ! I feel stupid ! Yes, the fuel pump priming. Sorry ! The car does seem to be running fine. It is not low on gas. It was filled 3-4 days ago. I will watch how it is running.

 

[Do_Will]

jblackburn, on your video, were you referring to the sound at the last 2 seconds of the video? I think that is what I hear. I will check again tonight.

 

[Do_Will]

No, it is not the brake assist vacuum. I don't have to hit the brake pedal to get the noise. I don't hear it after the engine starts (or it blends into the engine noise). It is almost like the fuel pump starts priming and doesn't stop. The car runs fine, so I am going to ignore it for now.

 

[Do_Will]

No, it is not PI1267. This is only before starting the engine. There is no noise after stopping the engine. And, air conditioner is off.

 

[Do_Will]

I have tracked the noise down to the vacuum assist pump.
Thanks, jblackburn. You were right.

The noise is from the vacuum assist pump. I hear the noise when the key is in START position (engine not started; brake not pressed). The noise stops after starting the engine. Then, I can hear it momentarily when I pump the brake. It stops immediately afterwards. Doesn't sound like it is continuously running (once the engine is started).

Could this be a bad vacuum assist pump? Could it be a leak? Wonder why it is constantly running before the engine starts.

 

[Do_Will]

Pete, thank you very much. Any chance, you can get me the part number (or the official name) ?
Is it #15 on this diagram - HYDRAULIC SYSTEM for 2012 Chevrolet Cruze ?

Thank you !!